1
MHT CET 2023 12th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

When light of wavelength $$\lambda$$ is incident on a photosensitive surface the stopping potential is '$$\mathrm{V}$$'. When light of wavelength $$3 \lambda$$ is incident on same surface the stopping potential is $$\frac{\mathrm{V}}{6}$$. Then the threshold wavelength for the surface is

A
$$2 \lambda$$
B
$$3 \lambda$$
C
$$4 \lambda$$
D
$$5 \lambda$$
2
MHT CET 2023 11th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

When a metallic surface is illuminated with radiation of wavelength '$$\lambda$$', the stopping potential is '$$\mathrm{V}$$'. If the same surface is illuminated with radiation of wavelength '$$2 \lambda$$', the stopping potential is '$$\left(\frac{\mathrm{v}}{4}\right)$$'. The threshold wavelength for the metallic surface is

A
$$\frac{5}{2} \lambda$$
B
$$3 \lambda$$
C
$$4 \lambda$$
D
$$5 \lambda$$
3
MHT CET 2023 11th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

A metal surface of work function $$1 \cdot 13 \mathrm{~eV}$$ is irradiated with light of wavelength $$310 \mathrm{~nm}$$. The retarding potential required to stop the escape of photoelectrons is [Take $$\frac{\mathrm{hc}}{\mathrm{e}}=1240 \times 10^{-9} \mathrm{SI}$$ units]

A
1.13 V
B
2.87 V
C
3.97 V
D
4.23 V
4
MHT CET 2023 11th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

The maximum kinetic energies of photoelectrons emitted are $$\mathrm{K}_1$$ and $$\mathrm{K}_2$$ when lights of wavelengths $$\lambda_1$$ and $$\lambda_2$$ are incident on a metallic surface. If $$\lambda_1=3 \lambda_2$$ then

A
$$\mathrm{K}_1=\frac{\mathrm{K}_2}{3}$$
B
$$\mathrm{K}_1<\frac{\mathrm{K}_2}{3}$$
C
$$\mathrm{K}_1=3 \mathrm{K}_2$$
D
$$3 \mathrm{K}_1=2 \mathrm{K}_2$$
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