1
MHT CET 2021 23th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

When wavelength of incident radiation on the metal surface is reduced from '$$\lambda_1$$' to '$$\lambda_2$$', the kinetic energy of emitted photoelectrons is tripled. The work function of metal [$$\mathrm{h}=$$ Plank's constant, $$\mathrm{c}=$$ velocity of light]

A
$$\frac{\mathrm{hc}}{2}\left[\frac{3 \lambda_1-\lambda_2}{\lambda_1 \lambda_2}\right]$$
B
$$\frac{\mathrm{hc}}{2}\left[\frac{3 \lambda_2-\lambda_1}{\lambda_1 \lambda_2}\right]$$
C
hc $$\left[\frac{3 \lambda_1-\lambda_2}{\lambda_1 \lambda_2}\right]$$
D
hc $$\left[\frac{3 \lambda_2-\lambda_1}{\lambda_1 \lambda_2}\right]$$
2
MHT CET 2021 23th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

An electron of mass '$$m$$' and a photon have same energy '$$E$$'. The ratio of de-Broglie wavelength of electron to the wavelength of photon is $$(\mathrm{c}=$$ velocity of light)

A
$$c \sqrt{\frac{E}{m}}$$
B
$$\frac{1}{c} \sqrt{\frac{2 m}{g}}$$
C
$$\frac{1}{c} \sqrt{\frac{E}{2 m}}$$
D
$$c \sqrt{\frac{m}{E}}$$
3
MHT CET 2021 22th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

When a photon enters glass from air, which one of the following quantity does not change?

A
Energy
B
Velocity
C
Wavelength
D
Momentum
4
MHT CET 2021 22th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

The light of wavelength '$$\lambda$$' is incident on the surface of metal of work function $$\phi$$ and emits the electron. The maximum velocity of electron emitted is [$$\mathrm{m}=$$ mass of electron and $$\mathrm{h}=$$ Planck's constant, $$\mathrm{c}=$$ velocity of light]

A
$$\left[\frac{2(h c-\lambda)}{\mathrm{m} \lambda}\right]^{\frac{1}{2}}$$
B
$$\left[\frac{2(h c-\phi) \lambda}{m c}\right]$$
C
$$\left[\frac{2(h c-\lambda)}{m \lambda}\right]$$
D
$$\left[\frac{2(\mathrm{hc}-\lambda \phi)}{\mathrm{m} \lambda}\right]^{\frac{1}{2}}$$
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