Statement-I: When ultraviolet light is incident on a photocell, its stopping potential is V 0 and the maximum kinetic energy of the photoelectrons is K When the ultraviolet light is replaced by X-rays, both V 0 and K max increase Statement-2: Photoelectrons are emitted with speeds ranging from zero to a maximum value because of the range of frequencies present in the incident light

Statement-I is true, Statement- 2 is false

Statement-I is true, Statement-2 is true Statement-2 is the correct explanation of statement - 1

Statement-I is true, Statement-2 is true , Statement-2 is not the correct explanation of statement -1

Statement-1 is false, statement – 2 is true

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The de-Broglie wavelength of a neutron in thermal equilibrium with heavy water at a temperature $T$ (kelvin) and mass $m$ , is:

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Important Questions on Dual Nature of Matter and Radiation

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Alpha Question Bank for Medical: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise-3>Q 31

When the light of frequency

2 v_{0}

(where

v_{0}

is threshold frequency), is incident on a metal plate, the maximum velocity of electrons emitted is

v_{1}

. When the frequency of the incident radiation is increased to

{5 v}_{0}

the maximum velocity of electrons emitted from the same plate is

v_{2}

. The ratio of

v_{1}

v_{2}

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Alpha Question Bank for Medical: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise-3>Q 32

An electron of mass

m

with an initial velocity

\bar{V} = V_{0} \hat{i} (V_{0} > 0)

enters an electric field

E = - E_{0} \hat{i}

, (

E_{0} =

constant

> 0

) at

t = 0, λ

is its de Broglie wavelength at a time

t

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Alpha Question Bank for Medical: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise-3>Q 33

The surface of a metal is illuminated with the light of

400 n m

. The kinetic energy of the ejected photoelectrons was found to be

1.68 e V

. The work function of the metal is (

h c = 1240 e V n m

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Alpha Question Bank for Medical: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise-3>Q 34

Statement-I: When ultraviolet light is incident on a photocell, its stopping potential is V_₀ and the maximum kinetic energy of the photoelectrons is K When the ultraviolet light is replaced by X-rays, both V_₀and K_{_max} increase

Statement-2: Photoelectrons are emitted with speeds ranging from zero to a maximum value because of the range of frequencies present in the incident light

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Alpha Question Bank for Medical: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise-3>Q 35

If a source of power

4 kW

produces

10^{20}

photons/second, the radiation belongs to a part of the spectrum called

HARD

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Alpha Question Bank for Medical: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise-3>Q 36

This question has Statement-I and Statement-2. Of the four choices given after the statements, choose the one that best describes the two statements

Statement-I : A metallic surface is irradiated by a monochromatic light of frequency $v > v_{0}$ (the threshold frequency). The maximum kinetic energy and the stopping potential are $a r e K_{m a x} a n d V_{0} a r e a l s o d o u b l e d, b o t h t h e K_{m a x} a n d v_{0} a r e a l s o d o u b l e d$

Statement-2 the maximum kinetic energy and the stopping potential of photoelectrons emitted from a surface are linearly dependent on the frequency of incident light

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Alpha Question Bank for Medical: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise-3>Q 37

After absorbing a slowly moving neutron of mass

m_{N}

(momentum

\approx 0

) a nucleus of mass

M

breaks into two nuclei of masses

m_{1}

and

5 m_{1} (6 m_{1} = M + m_{N})

, respectively. If the de Broglie wavelength of the nucleus with mass

m_{1}

λ

, then the de Broglie wavelength of the other nucleus will be

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Alpha Question Bank for Medical: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise-3>Q 38

The anode voltage of a photocell is kept fixed. The wavelength

λ

of the light falling on the cathode is gradually changed. The plate current

I

of the photocell varies as follows

The de-Broglie wavelength of a neutron in thermal equilibrium with heavy water at a temperature T (kelvin) and mass m, is:

Important Questions on Dual Nature of Matter and Radiation

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The de-Broglie wavelength of a neutron in thermal equilibrium with heavy water at a temperature $T$ (kelvin) and mass $m$ , is: