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

According to de-Broglie hypothesis if an electron of mass '$$m$$' is accelerated by potential difference '$$V$$', the associated wavelength is '$$\lambda$$'. When a proton of mass '$$\mathrm{M}$$' is accelerated through potential difference $$9 \mathrm{~V}$$, then the wavelength associated with it is

A
$$\frac{\lambda}{3} \sqrt{\frac{\mathrm{m}}{\mathrm{M}}}$$
B
$$\frac{3}{2} \sqrt{\frac{m}{M}}$$
C
$$\frac{\lambda}{3} \sqrt{\frac{M}{m}}$$
D
$$\frac{3}{\lambda} \sqrt{\frac{\mathrm{M}}{\mathrm{m}}}$$
2
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 $$\left[\frac{3 \lambda_2-\lambda_1}{\lambda_1 \lambda_2}\right]$$
3
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
$$c \sqrt{\frac{m}{E}}$$
4
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
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