MHT CET 2021 23th September Morning Shift | Dual Nature of Radiation Question 30 | Physics

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)

$$c \sqrt{\frac{E}{m}}$$

$$\frac{1}{c} \sqrt{\frac{2 m}{g}}$$

$$\frac{1}{c} \sqrt{\frac{E}{2 m}}$$

$$c \sqrt{\frac{m}{E}}$$

MHT CET 2021 22th September Evening Shift

MCQ (Single Correct Answer)

-0

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

Energy

Velocity

Wavelength

Momentum

MHT CET 2021 22th September Evening Shift

MCQ (Single Correct Answer)

-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]

$$\left[\frac{2(h c-\lambda)}{\mathrm{m} \lambda}\right]^{\frac{1}{2}}$$

$$\left[\frac{2(h c-\phi) \lambda}{m c}\right]$$

$$\left[\frac{2(h c-\lambda)}{m \lambda}\right]$$

$$\left[\frac{2(\mathrm{hc}-\lambda \phi)}{\mathrm{m} \lambda}\right]^{\frac{1}{2}}$$

MHT CET 2021 22th September Evening Shift

MCQ (Single Correct Answer)

-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 $$\mathrm{h}=6.63 \times 10^{34} \mathrm{~Js}$$ ]

8.29 eV

6.5 eV

4.2 eV

1.71 eV

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