1
MHT CET 2023 10th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

An electron accelerated through a potential difference '$$V_1$$' has a de-Broglie wavelength '$$\lambda$$'. When the potential is changed to '$$V_2$$' its de-Broglie wavelength increases by $$50 \%$$. The value of $$\left(\frac{\mathrm{V}_1}{\mathrm{~V}_2}\right)$$ is

A
$$3: 1$$
B
$$9: 4$$
C
$$3: 2$$
D
$$4: 1$$
2
MHT CET 2023 10th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

Maximum kinetic energy of photon is '$$E$$' when wavelength of incident radiation is '$$\lambda$$'. If wavelength of incident radiations is reduced to $$\frac{\lambda}{3}$$ then energy of photon becomes four times. Then work function of the metal is

A
$$\frac{3 h c}{\lambda}$$
B
$$\frac{\mathrm{hc}}{3 \lambda}$$
C
$$\frac{h c}{\lambda}$$
D
$$\frac{\mathrm{hc}}{2 \lambda}$$
3
MHT CET 2023 9th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

When photons of energies twice and thrice the work function of a metal are incident on the metal surface one after other, the maximum velocities of the photoelectrons emitted in the two cases are $$\mathrm{v}_1$$ and $$\mathrm{v}_2$$ respectively. The ratio $$\mathrm{v}_1: \mathrm{v}_2$$ is

A
$$\sqrt{2}: 1$$
B
$$\sqrt{3}: 1$$
C
$$\sqrt{3}: \sqrt{2}$$
D
$$1: \sqrt{2}$$
4
MHT CET 2023 9th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

When a certain metal surface is illuminated with light of frequency $$v$$, the stopping potential for photoelectric current is $$\mathrm{V}_0$$. When the same surface is illuminated by light of frequency $$\frac{v}{2}$$, the stopping potential is $$\frac{\mathrm{V}_0}{4}$$, the threshold frequency of photoelectric emission is

A
$$\frac{v}{6}$$
B
$$\frac{v}{3}$$
C
$$\frac{2 v}{3}$$
D
$$\frac{4 v}{3}$$
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