1
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
$$c \sqrt{\frac{m}{E}}$$
2
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
3
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
$$\left[\frac{2(\mathrm{hc}-\lambda \phi)}{\mathrm{m} \lambda}\right]^{\frac{1}{2}}$$
4
MHT CET 2021 22th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

Photons of energy $$10 \mathrm{~eV}$$ are incident on a photosensitive surface of threshold frequency $$2 \times 10^{15} \mathrm{~Hz}$$. The kinetic energy in $$\mathrm{eV}$$ of the photoelectrons emitted is

[Planck's constant $$\mathrm{h}=6.63 \times 10^{34} \mathrm{~Js}$$ ]

A
8.29 eV
B
6.5 eV
C
4.2 eV
D
1.71 eV
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