1
MHT CET 2021 20th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

When light of wavelength '$$\lambda$$' is incident on a photosensitive surface, photons of power 'P' are emitted. The number of photon 'n' emitted in time 't' is [h = Planck's constant, c = velocity of light in vacuum]

A
$$\mathrm{\frac{hc}{p\lambda t}}$$
B
$$\mathrm{\frac{P\lambda}{htc}}$$
C
$$\mathrm{\frac{P\lambda t}{hc}}$$
D
$$\mathrm{\frac{hP}{\lambda tc}}$$
2
MHT CET 2021 20th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

When a photosensitive surface is irradiated by light of wavelengths '$$\lambda_1$$' and '$$\lambda_2$$', kinetic energies of emitted photoelectrons are 'E$$_1$$' and 'E$$_2$$' respectively. The work function of photosensitive surface is

A
$$\frac{\left(\lambda_1 E_1-\lambda_2 E_2\right)}{\left(\lambda_2-\lambda_1\right)}$$
B
$$\frac{\left(\lambda_1 \mathrm{E}_1+\lambda_2 \mathrm{E}_2\right)}{\left(\lambda_2-\lambda_1\right)}$$
C
$$\frac{\left(\lambda_1 \mathrm{E}_2-\lambda_2 \mathrm{E}_1\right)}{\left(\lambda_2-\lambda_1\right)}$$
D
$$\frac{\left(\lambda_1 E_2+\lambda_2 E_1\right)}{\left(\lambda_2-\lambda_1\right)}$$
3
MHT CET 2020 19th October Evening Shift
MCQ (Single Correct Answer)
+1
-0

The graph of stopping potential $V_s$ against frequency $v$ of incident radiation is plotted for two different metals $P$ and $Q$ as shown in the graph. $\phi_p$ and $\phi_Q$ are work-functions of $P$ and $Q$ respectively, then

MHT CET 2020 19th October Evening Shift Physics - Dual Nature of Radiation Question 65 English

A
$\phi_P>\phi_Q$
B
$\phi_P<\phi_Q$
C
$\phi_P=\phi_Q$
D
$\nu_0^{\prime}<\nu_0$
4
MHT CET 2020 19th October Evening Shift
MCQ (Single Correct Answer)
+1
-0

If the maximum kinetic energy of emitted electrons in photoelectric effect is $3.2 \times 10^{-19} \mathrm{~J}$ and the work-function for metal is $6.63 \times 10^{-19} \mathrm{~J}$, then stopping potential and threshold wavelength respectively are

[Planck's constant, $h=6.63 \times 10^{34} \mathrm{~J}$-s]

[Velocity of light, $c=3 \times 10^8 \frac{\mathrm{~m}}{\mathrm{~s}}$ ]

[Charge on electron $=1.6 \times 10^{-19} \mathrm{C}$ ]

A
4V, 6000$\mathop A\limits^o$
B
3V, 4000$\mathop A\limits^o$
C
2V, 3000$\mathop A\limits^o$
D
1V, 1000$\mathop A\limits^o$
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