1
MHT CET 2024 4th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

The kinetic energy of an electron is increased by 2 times, then the de-Broglie wavelength associated with it changes by a factor.

A
$\frac{1}{3}$
B
$\frac{1}{\sqrt{3}}$
C
3
D
$\sqrt{3}$
2
MHT CET 2024 4th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

A photosensitive metallic surface has work function $\phi$. If photon of energy $3 \phi$ falls on the surface, the electron comes out with a maximum velocity of $6 \times 10^6 \mathrm{~m} / \mathrm{s}$. When the photon energy is increased to $9 \phi$, then maximum velocity of photoelectrons will be

A
$12 \times 10^6 \mathrm{~m} / \mathrm{s}$
B
$6 \times 10^6 \mathrm{~m} / \mathrm{s}$
C
$3 \times 10^6 \mathrm{~m} / \mathrm{s}$
D
$24 \times 10^6 \mathrm{~m} / \mathrm{s}$
3
MHT CET 2024 4th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

The threshold frequency of a metal is ' $F_0$ '. When light of frequency $2 F_0$ is incident on the metal plate, the maximum velocity of photoelectron is ' $\mathrm{V}_1$ '. When the frequency of incident radiation is increased to ' $5 \mathrm{~F}_0$ ', the maximum velocity of photoelectrons emitted is ' $V_2$ '. The ratio of $V_1$ to $V_2$ is

A
$\frac{1}{8}$
B
$\frac{1}{16}$
C
$\frac{1}{4}$
D
$\frac{1}{2}$
4
MHT CET 2024 4th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

For a photosensitive material, work function is ' $\mathrm{W}_0$ ' and stopping potential is ' V '. The wavelength of incident radiation is ( $\mathrm{h}=$ Planck's constant, $c=$ velocity of light, $e=$ electronic charge)

A
$\frac{h^2 c^2}{W_0+e V}$
B
$\frac{\mathrm{hc}}{\mathrm{W}_0}$
C
$\frac{\mathrm{hcV}}{\mathrm{W}_0}$
D
$\frac{\mathrm{hc}}{\mathrm{W}_0+\mathrm{eV}}$
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