Fizika (06.04.2026) 1-smena

45 ta savol · saqlash uchun kiring

Fizika formulalar varaqasi / Лист формул по физике

Doimiy fizik kattaliklar / Физические постоянные

Kattalik	Qiymati
Erkin tushish tezlanishi	$g \approx 10\ \text{m/s}^2$
Gravitatsiya doimiysi	$G = \frac{20}{3}\cdot10^{-11}\ \frac{\text{N}\cdot\text{m}^2}{\text{kg}^2}$
Universal gaz doimiysi	$R = 8{,}31\ \text{J/(mol}\cdot\text{K)}$
Bolsman doimiysi	$k = 1{,}38\cdot10^{-23}\ \text{J/K}$
Avogadro soni	$N_A = 6\cdot10^{23}\ \text{mol}^{-1}$
Elementar zaryad	$e = 1{,}6\cdot10^{-19}\ \text{C}$
Kulon qonuni koeffitsiyenti	$k = 9\cdot10^{9}\ \frac{\text{N}\cdot\text{m}^2}{\text{C}^2}$
Elektr doimiysi	$\varepsilon_0 = 8{,}85\cdot10^{-12}\ \frac{\text{F}}{\text{m}}$
Magnit doimiysi	$\mu_0 = 4\pi\cdot10^{-7}\ \text{N/A}^2$
Yorug'likning vakuumdagi tezligi	$c = 3\cdot10^{8}\ \text{m/s}$
Plank doimiysi	$h = 4{,}125\cdot10^{-15}\ \text{eV}\cdot\text{s}$
Plank doimiysi	$h = 6{,}6\cdot10^{-34}\ \text{J}\cdot\text{s}$

O'nli old qo'shimchalar / Десятичные приставки

Old qo'shimcha	Ko'paytuvchi
T — tera	$10^{12}$
G — giga	$10^{9}$
M — mega	$10^{6}$
k — kilo	$10^{3}$
d — detsi	$10^{-1}$
c — santi	$10^{-2}$
m — milli	$10^{-3}$
$\mu$ — mikro	$10^{-6}$
n — nano	$10^{-9}$
p — piko	$10^{-12}$

Mexanika / Механика

v=\frac{\Delta S}{\Delta t};\quad a=\frac{\Delta v}{\Delta t};\quad S=v_0t+\frac{at^2}{2};\quad \omega=\frac{\Delta\varphi}{\Delta t};\quad \varepsilon=\frac{\Delta\omega}{\Delta t};\quad \varphi=\omega_0t+\frac{\varepsilon t^2}{2};

\omega=2\pi\nu;\quad v=\omega r;\quad \nu\cdot T=1;\quad v=v_0\pm gt;\quad h=v_0t\pm\frac{gt^2}{2};

v_{0x}=v_0\cos\alpha;\quad v_{0y}=v_0\sin\alpha;\quad t_u=\frac{2v_{0y}}{g};\quad h_{max}=\frac{v_{0y}^2}{2g};\quad S=v_{0x}\cdot t_u;

\vec{a}=\vec{a}_\tau+\vec{a}_n;\quad a_n=\frac{v^2}{r};\quad m=\rho V;\quad \vec{a}=\frac{\vec{F}}{m};\quad \vec{F}_1=-\vec{F}_2;\quad F_{el}=-k\Delta\ell;

a=g(\sin\alpha\pm\mu\cos\alpha);\quad \vec{p}=m\vec{v};\quad \vec{F}\Delta t=\Delta\vec{p};\quad E_k=\frac{mv^2}{2};

M=F\ell;\quad F_1\ell_1=F_2\ell_2;\quad F_{ish}=\mu N;\quad N=\frac{A}{t}=\vec{F}\vec{v};

A=FS\cos\alpha;\quad E_p=mgh;\quad E_k+E_p=\text{const};\quad \vec{P}=m(\vec{g}-\vec{a});

g=\frac{GM}{R^2};\quad v_1=\sqrt{gR};\quad v_2=\sqrt{2gR};\quad x=A\cdot\sin(\omega t+\varphi_0);\quad v=\sqrt{\frac{T}{\rho_{ch}}};

v=\sqrt{\frac{E}{\rho}};\quad \omega=\sqrt{\frac{k}{m}};\quad T=2\pi\sqrt{\frac{m}{k}};\quad \omega=\sqrt{\frac{g}{\ell}};\quad T=2\pi\sqrt{\frac{\ell}{g}};\quad \Delta\ell=\ell-\ell_0;

\varepsilon=\frac{\Delta\ell}{\ell_0};\quad k=\frac{ES}{\ell_0};\quad F_A=\rho_sV_bg;\quad p=\rho gh;\quad S_1v_1=S_2v_2;

V_b=\frac{\rho_jV_j}{\rho_s};\quad p+\rho gh+\frac{\rho v^2}{2}=\text{const}.

Molekulyar fizika / Молекулярная физика

\nu=\frac{N}{N_A}=\frac{m}{M};\quad n=\frac{N}{V};\quad d=\sqrt[3]{\frac{VM}{mN_A}};\quad \rho=nm_0;

p=\frac{2}{3}n\bar{E}_k=\frac{1}{3}\rho\bar{v}^2=nkT;\quad \bar{E}_k=\frac{m_0\bar{v}^2}{2}=\frac{3}{2}kT;

\bar{v}=\sqrt{\frac{3RT}{M}}=\sqrt{\frac{3kT}{m_0}};\quad T=t+273;

pV=\nu RT;\quad p=\frac{\rho}{M}RT;\quad \frac{pV}{T}=\text{const};\quad Q=\Delta U+A;

A=p\Delta V;\quad \Delta U=\frac{3}{2}(p_2V_2-p_1V_1)=\frac{3}{2}\nu RT;\quad C=\frac{Q}{T_2-T_1};

c=\frac{Q}{m(T_2-T_1)};\quad \lambda=\frac{Q}{m};\quad r=\frac{Q}{m};\quad q=\frac{Q}{m};

\eta=\frac{Q_1-Q_2}{Q_1}\cdot100\ \%=\frac{T_1-T_2}{T_1}\cdot100\ \%;\quad F=\sigma l;

\sigma=\frac{F}{S};\quad \sigma=E|\varepsilon|;\quad W=\sigma S;\quad h=\frac{2\sigma}{\rho gr};\quad \Delta p=\frac{2\sigma}{R};

\rho=\frac{m}{V};\quad \varphi=\frac{\rho}{\rho_0}\cdot100\ \%=\frac{p}{p_0}\cdot100\ \%.

Elektr va magnetizm / Электричество и магнетизм

F=\frac{k|qQ|}{\varepsilon r^2};\quad E=\frac{k|Q|}{\varepsilon r^2};\quad F=qE;\quad \varphi=\frac{kQ}{\varepsilon r};\quad W_p=q\varphi;

E=\frac{\varphi_1-\varphi_2}{d};\quad A=q(\varphi_1-\varphi_2);\quad W_{el}=\frac{qU}{2};\quad C=\frac{\varepsilon\varepsilon_0S}{d};\quad q=CU;

W=\frac{\varepsilon\varepsilon_0E^2}{2};\quad C_p=C_1+C_2+\cdots+C_N;\quad \frac{1}{C_{k-k}}=\frac{1}{C_1}+\frac{1}{C_2}+\cdots+\frac{1}{C_N};

E=\frac{U}{d}=\frac{\sigma}{\varepsilon\varepsilon_0};\quad I=\frac{U}{R};\quad Q=I^2Rt;\quad P=IU;\quad I=ne\bar{v}S;\quad j=\frac{I}{S};

q=It;\quad E=\rho j;\quad R=\frac{\rho l}{S};\quad R=R_0(1+\alpha\Delta t);\quad R_{k-k}=R_1+R_2+\cdots+R_N;

\frac{1}{R_p}=\frac{1}{R_1}+\frac{1}{R_2}+\cdots+\frac{1}{R_N};\quad \mathcal{E}=\frac{A_{chet}}{q};\quad I=\frac{\mathcal{E}}{R+r};\quad \eta=\frac{R}{R+r}=\frac{U}{\mathcal{E}};

I_a=kU^{\frac{3}{2}};\quad T=2\pi\sqrt{LC};\quad \omega=\frac{1}{\sqrt{LC}};\quad W=\frac{q^2}{2C}+\frac{LI^2}{2};

Z=\sqrt{R^2+\left(\omega L-\frac{1}{\omega C}\right)^2};\quad I=\frac{U}{Z};\quad \cos\varphi=\frac{R}{Z};\quad P=I^2R=IU\cos\varphi;

I=\frac{I_0}{\sqrt{2}};\quad U=\frac{U_0}{\sqrt{2}};\quad B=\frac{\mu_0I}{2\pi R};\quad B=\frac{\mu_0I}{2R};\quad F=\frac{\mu\mu_0I_1I_2}{2\pi d}l;

F_A=BIl\sin\alpha;\quad F_L=qvB\sin\alpha;\quad R=\frac{mv}{qB};\quad T=\frac{2\pi m}{qB};\quad \omega=\frac{qB}{m};

\Phi=NBS\cos\alpha;\quad \Phi=LI;\quad W=\frac{\Phi I}{2}=\frac{LI^2}{2};\quad \mathcal{E}=-\frac{\Delta\Phi}{\Delta t}=-L\frac{\Delta I}{\Delta t}.

Optika, kvant, atom va yadro fizikasi. Nisbiylik nazariyasi

n=\frac{c}{v}=\sqrt{\varepsilon\mu};\quad \frac{\sin\alpha}{\sin\beta}=\frac{n_2}{n_1};\quad \pm\frac{1}{F}=\frac{1}{d}\pm\frac{1}{f};\quad D=\pm\frac{1}{F};

k=\frac{f}{d};\quad \frac{1}{F}=\left(\frac{n_l}{n_m}-1\right)\left(\pm\frac{1}{R_1}\pm\frac{1}{R_2}\right);\quad I=\frac{P}{S}=\mathcal{W}v;\quad I\sim\omega^4;

d\sin\varphi=k\lambda;\quad \lambda_m=\frac{b}{T};\quad I=\frac{I_0}{2};\quad I=I_0\cos^2\alpha;\quad I=\frac{\Phi}{\Omega};

E=\frac{\Phi}{S}=\frac{I}{R^2}\cos\varphi;\quad E=h\nu;\quad p=\frac{h\nu}{c}=\frac{h}{\lambda};\quad I=\frac{N}{S\cdot t}h\nu;

h\nu=A_{ch}+E_k^{max};\quad E_k^{max}=eU_{yop};\quad h\nu_{min}=\frac{hc}{\lambda_{max}}=A_{ch};

E_n=\frac{E_1}{n^2};\quad E_1=-13{,}6\ eV;\quad h\nu=E_n-E_m;\quad m_ev_nr_n=n\hbar;

r_n=n^2r_B;\quad v_n=\frac{v_1}{n};\quad E_{bog'}=\Delta mc^2;\quad E_{sol}=\frac{E_{bog'}}{A};

A=-\frac{dN}{dt};\quad N=N_0e^{-\lambda t}=N_0 2^{-\frac{t}{T}};\quad \lambda T=\ln 2\approx0{,}7;

\tau=\frac{\tau_0}{\sqrt{1-\frac{v^2}{c^2}}};\quad l=l_0\sqrt{1-\frac{v^2}{c^2}};\quad \rho=\frac{\rho_0}{1-\frac{v^2}{c^2}};\quad v=\frac{v_1+v_2}{1\pm\frac{v_1v_2}{c^2}};

m=\frac{m_0}{\sqrt{1-\frac{v^2}{c^2}}};\quad E_0=m_0c^2;\quad E=mc^2;\quad \vec{p}=m\vec{v};

E_k=(m-m_0)c^2;\quad E^2-c^2p^2=m_0^2c^4.

Moddalar va ularning xossalari / Вещества и их свойства

Zichlik (kg/m$^3$) / Плотность

Modda	Zichlik
benzin	700
kerosin	800
suv (4 °C)	1000
spirt	800
simob	13600
alyuminiy	2700
muz	900
mis	8900
po'lat	7800
temir	7800

Solishtirma issiqlik sig'imi (J/(kg·K)) / Удельная теплоёмкость

Modda	Qiymat
alyuminiy	900
mis	380
muz	2100
oltin	120
rux	400
suv	4200
temir	450
cho'yan	500

Molyar massa (g/mol) / Молярная масса

Modda	M
argon (Ar)	40
azot ( $N_2$ )	28
geliy (He)	4
neon (Ne)	20
havo	29
suv ( $H_2O$ )	18
karbonad angidrid ( $CO_2$ )	44
mis (Cu)	64
alyuminiy (Al)	27
kislorod ( $O_2$ )	32
vodorod ( $H_2$ )	2

Boshqa kattaliklar

Kattalik	Qiymat
Muzning solishtirma erish issiqligi (0 °C)	$330\cdot10^{3}\ \text{J/kg}$
Suvning solishtirma bug'lanish issiqligi (100 °C)	$2{,}3\cdot10^{6}\ \text{J/kg}$
Benzinning yonish issiqligi	$46\cdot10^{6}\ \text{J/kg}$
Neftning yonish issiqligi	$44\cdot10^{6}\ \text{J/kg}$
Spirtning yonish issiqligi	$29\cdot10^{6}\ \text{J/kg}$
Tabiiy gazning yonish issiqligi	$44\cdot10^{6}\ \text{J/kg}$
Toshko'mirning yonish issiqligi	$29\cdot10^{6}\ \text{J/kg}$
Yog'ochning yonish issiqligi	$10\cdot10^{6}\ \text{J/kg}$

Sirt taranglik koeffitsiyenti (20 °C), $10^-3$ N/m

Modda	Qiymat
benzin	21
kerosin	24
suv	73
spirt	22
sovun eritmasi	40
simob	510

O'tkazgichlarning solishtirma qarshiligi (20 °C), $10^-8\ \Omega\cdot$m

Modda	Qiymat
mis	1,7
alyuminiy	2,8
volfram	5,5
temir	9,8
nikelin	40
nixrom	110

Nur sindirish ko'rsatkichi / Показатель преломления

Modda	n
suv	$4/3$
shisha	1,5
yoqut	1,76
olmos	2,42

Ayrim birliklar o'rtasidagi munosabat va normal sharoit

Munosabat	Qiymat
0 °C	$273\ \text{K}$
1 u	$1{,}66\cdot10^{-27}\ \text{kg}$
1 eV	$1{,}6\cdot10^{-19}\ \text{J}$
1 mm Hg	$133{,}3\ \text{Pa}$
Normal bosim	$10^{5}\ \text{Pa}$
Normal temperatura	$0\ ^\circ\text{C}$

Shartli belgilar / Условные обозначения

× ×— magnit induksiya chiziqlari o'quvchidan qog'oz tekisligiga tik yo'nalgan
• •— magnit induksiya chiziqlari qog'oz tekisligidan o'quvchiga tik yo'nalgan
⊕— o'tkazgichdagi tok o'quvchidan qog'oz tekisligiga tik yo'nalgan
⊙— o'tkazgichdagi tok qog'oz tekisligidan o'quvchiga tik yo'nalgan

Eslatma: bu formulalar yordam sifatida tavsiya qilinadi.

Yer ekvatorining uzunligi 40000 km ga teng. Reaktiv raketa 3200 km/h tezlik bilan harakatlansa, ekvatorni qancha vaqtda (h) aylanib chiqadi?

Jism 3 m/s

^2

tezlanish bilan harakatlanmoqda. Uning 4 s dan keyingi o'rtacha tezligi 16 m/s ga teng. Jismning boshlang'ich tezligini (m/s) toping.

Kuchning tezlanishga nisbati nimani ifodalaydi?

Jism qiya tekislikda harakatsiz turibdi. Jism va sirt orasidagi ishqalanish koeffitsiyenti

\mu = \sqrt{3}

ga teng. Jismga ta'sir etuvchi ishqalanish kuchini (N) aniqlang.

Gorizontga burchak ostida otilgan jismning maksimal potensial energiyasi to'la energiyaning 75 % ini tashkil qiladi. Jismning uloqtirish burchagini aniqlang.

Radiuslari 6 cm va 4 cm bo'lgan sharlarning massalari mos ravishda 40 kg va 24 kg ga teng. Ular o'zaro 14 cm uzunlikdagi sterjen orqali bog'langan. Sistemaning massa markazi 6 cm radiusli sharning massa markazidan qanday masofada (cm) turibdi?

Sig'imi 280 m

^3

bo'lgan hovuzda 9 ta nasos o'rnatilgan. Bitta nasos 15 minutda 6 t suvni tortib chiqaradi. 9 ta nasos 1 soat davomida ishlaganda hovuzda qancha suv (t) qoladi?

Chizmada berilgan ma'lumotlardan foydalanib jismning suyuqlikka botgan qismining hajmini (dm

^3

) toping. Jismning to'la hajmi 48 dm

^3

, zichligi 1250 kg/m

^3

ga teng.

Hajmi 6 cm

^3

bo'lgan jism suvli idish tubida yotibdi. Unga gorizontal yo'nalishda

\sqrt{44}

m/s

^2

tezlanish berildi. Jismga ta'sir qilayotgan arximed kuchini (mN) aniqlang.

10.

Garmonik tebranayotgan jismning to'lqin uzunligi 0,8 m ga teng. To'lqinning birinchi va to'rtinchi do'ngliklari orasidagi masofani (m) toping.

11.

Tebranma harakat qilayotgan jismning siljish tenglamasi

x = 2\cos(2,5\pi t)

[cm] ko'rinishga ega. Jismning maksimal tezlanishini (m/s

^2

) aniqlang.

\pi^2 \approx 10

12.

2 mol

C_3H_8

ning massasini (g) aniqlang.

13.

Yupiter atmosferasi asosan geliy gazidan iborat. Uning bosimi 100 kPa, zichligi esa 1,3 kg/m

^3

ga teng. Uning temperaturasini (K) aniqlang.

14.

Xona o'lchamlari 3 m

\times

4 m

\times

5 m ga teng. Xonaning nisbiy namligi 50 % ga teng. Xona harorati 20

^\circ

C ga teng. Xonadagi suv bug'ining massasini (g) aniqlang. 20

^\circ

C da to'yingan bug'ning zichligi 17,2 g/m

^3

ga teng.

15.

Yung moduli 200 GPa bo'lgan qattiq jismning mexanik kuchlanishi 120 MPa ga teng. Nisbiy uzayishni (%) aniqlang.

16.

Modda miqdori 5 mol bo'lgan bir atomli gaz

p = kV

qonuniyat bilan kengaymoqda. Agar temperatura 40 K ga ortgan bo'lsa, gaz olgan issiqlik miqdorini (J) aniqlang.

k

— o'zgarmas son.

17.

Bir jinsli elektr maydonning ikki nuqtasi orasidagi maydon kuchlanganligi 120 V/m ga, nuqtalar orasidagi masofa 5 cm ga teng. Nuqtalar orasidagi potensiallar farqini (V) aniqlang.

18.

Zaryadi

q

bo'lgan sharning radiusi

R

ga teng. Uning sirt energiyasini hisoblang.

19.

Sirt energiyasi 8,1 mJ bo'lgan sharning radiusi 5 cm ga teng. Uning sirt zichligini (

\mu

C/m

^2

) aniqlang.

\pi^2 \approx 10

20.

O'tkazgich simdagi tok kuchi

I = 5t

[A] qonuniyat bo'yicha o'zgarayotgan bo'lsa, 4 s da undan qancha zaryad (C) oqib o'tadi?

21.

Reostat surgichi pastga surilganda ideal ampermetrning ko'rsatkichi qanday o'zgaradi?

22.

Grafikda metall o'tkazgich qarshiligining temperaturaga bog'lanishi tasvirlangan. Qarshilikning termik koeffitsiyentini (K

^{-1}

) toping.

23.

Fazoning bir nuqtasida janubga tomon 0,3 T, g'arbga 0,9 T va sharqqa 0,5 T magnit induksiya hosil bo'lmoqda. Shu nuqtadagi natijaviy induksiyani (T) aniqlang.

24.

O'zgarmas tok manbaiga ideal induktiv g'altak ulangan. Bunda

4L_1 = 3L_2

ga teng. Birinchi g'altakdagi magnit oqim 72 mWb ga teng bo'lsa, ikkinchi g'altakdagi magnit oqimni (mWb) toping. G'altaklarning aktiv qarshiligini inobatga olmang.

25.

Induktiv g'altak orqali

I = 15

A tok o'tmoqda. G'altakning magnit oqimi

\phi = 6

Wb ga teng. G'altakda hosil bo'lgan magnit maydon energiyasini (J) aniqlang.

26.

Sig'imi

C

bo'lgan kondensator dastlab

q_0

zaryadgacha zaryadlandi va manbadan uzilib induktiv g'altakka ulandi. Natijada tebranish konturi hosil bo'ldi. Kondensatordagi zaryad

2q_0/3

bo'lgan paytda g'altakdagi magnit maydon energiyasini toping.

27.

Fokus masofasi 20 cm bo'lgan linzada buyumning 4/3 marta kattalashgan mavhum tasviri hosil bo'ldi. Buyum bilan tasvir orasidagi masofani (cm) aniqlang.

28.

Lupaning optimal kattalashtirishi 6 ga teng bo'lsa, uning fokus masofasini (cm) toping.

29.

Ikki zarracha bir xil yo'nalishda

c/2

2c/5

tezlikda harakatlanmoqda. Ularning nisbiy tezligini aniqlang.

c

— yorug'likning vakuumdagi tezligi.

30.

Metall uchun qizil chegarasi

\lambda

ga teng. Metall sirtiga to'lqin uzunligi

3\lambda/5

fotonlar oqimi tushmoqda. Sirtdan chiqayotgan fotoelektronlarning maksimal kinetik energiyasini toping.

31.

Moddaning 2-statsionar orbitasidagi elektronining to'la energiya

-8

eV bo'lsa, elektronning 5-sathdagi kinetik energiyani (eV) toping.

32.

Atom reaktorida neytronlarning ko'payish koeffitsiyenti 1,2 bo'lsa nima sodir bo'ladi?

Topshiriqlar (33-35) va javob variantlari (A-F) ni o'zaro moslashtiring.

33-35.

Ikkita teng radiusli sharchalarning energiyalari mos ravishda 6,4 mJ va 3,6 mJ ga teng. Ular ingichka sim bilan tutashtirildi.

Javob variantlari:

1,4

0,2

4,9

0,1

1,5

36.

Massalari

m = 4

kg dan bo'lgan ikki brusok rasmda ko'rsatilgandek arqon yordamida mahkamlanib

F = 60

N kuch bilan tortib ketilmoqda. Brusoklar va sirt orasidagi ishqalanish koeffitsiyenti

\mu = 0,5

ga teng. Harakat davomida burchak o'zgarmaydi.

a) Arqonning taranglik kuchini (N) toping.

b) Jismlarning tezlanishini (m/s

^2

) aniqlang.

37.

Massasi 0,5 kg bo'lgan jism yuqoriga tik uloqtirildi. Jism qayta tushguncha 3 s vaqt ketdi. Parvoz davomidagi havoning qarshiligi doimiy va 3 N ga teng bo'lgan.

a) Jismning boshlang'ich tezligini (m/s) toping.

b) Jismning maksimal ko'tarilish balandligini (m) toping.

38.

Massasi 500 g bo'lgan jism 4 m balandlikdan 10 m/s boshlang'ich tezlik bilan jism tik pastga uloqtirildi. U yerga urilish natijasida 9 J energiya issiqlikka aylandi.

a) Jismning birinchi urilishdan keyingi maksimal balandligini (m) aniqlang.

b) Jismning yerga birinchi va ikkinchi urilishlar orasidagi vaqt intervalini (s) aniqlang.

39.

70 m chuqurlikda suv pufakchasi bor. Uning yuzasi 0,8 cm

^2

ga teng.

T = \text{const}

a) Pufakchaning suv sirti yaqinidgi to'la sirtini (cm

^2

) aniqlang.

b) Pufakchaning energiyasi qanchaga (

\mu

J) ortgan?

40.

Detall 40 mol misdan yasalgan.

a) Detallning issiqlik sig'imini (J/K) aniqlang.

b) Temperatura 60 K ga ortganda olingan issiqlik moqdorini (kJ) toping.

41.

Massasi 20 mg bo'lgan 4 nC zaryadli zarracha zaryadi 6 nC bo'lgan qo'zg'almas zaryadga 60 cm/s tezlik bilan uzoq masofadan yaqinlashmoqda.

a) Zarrachalar orasidagi minimal masofani (cm) aniqlang.

b) Ular orasidagi maksimal Kulon kuchini (

\mu

N) aniqlang.

42.

Elektr zanjirida qarshiliklari

R_1 = 10

\Omega

R_2 = 15

\Omega

R_3 = 20

\Omega

ga teng bo'lgan rezistorlar shunday aralash ulanganki, natijada umumiy qarshilik 10

\Omega

ga teng bo'ldi. Zanjirdagi

R_3

qarshilikdan oqayotgan tok 2 A ga teng.

R_2

qarshilikdagi tok kuchini (A) aniqlang.

R_2

qarshilikdan ajralayotgan quvvatni (W) aniqlang.

43.

Yorug'lik kuchi 500 cd bo'lgan lampa yerdan 5 m balandlikda osilgan.

\pi \approx 3

a) Lampaning to'la yorug'lik oqimini (lm) toping.

b) Lampa ostidagi yer sirtining yoritilganligini (lx) aniqlang.

44.

Fokus masofasi 45 cm bo'lgan linzada buyumning 3 marta kattalashgan to'g'ri tasviri hosil bo'ldi.

a) Linzadan tasvirgacha masofani (cm) aniqlang.

b) Buyum va tasvir orasidagi masofani (cm) aniqlang.

45.

Ikki xil izotopning yarim yemirilish davrlari mos ravishda

T

2T

ga teng. Ularning umumiy aktivligi

A

ga teng.

t = 4T

vaqt o'tgandan keyin umumiy aktivlik

A/10

ga teng bo'lib qoldi.

a) Birinchi izotopning boshlang'ich aktivligini toping.

t = 4T

vaqtdan keyin oxirgi atomlar sonining nisbatini aniqlang.

Savol	A	B	C	D	E	F
33. Ikkinchi sharchaning tekkizilgandan keyingi energiyasini (mJ) toping.
34. Birinchi sharchaning energiyasi qanchaga (mJ) o'zgargan.
35. Simdan qancha issiqlik miqdori (mJ) ajralgan?