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If work function of a metal is $3 eV$ and wavelength of subjected radiation to the metal is $275 nm$ . Then the de Broglie's wavelength (in Å) of photoelectrons emitted by the metal is nearly $n$ . Value of $n$ rounded off to nearest integer, is
(Given $h c = 1240 eV nm$ )

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Important Questions on Dual Nature of Radiation and Matter

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Gamma Question Bank for Engineering Physics>Chapter 27 - Dual Nature of Radiation and Matter>Assignment Set-2>Q 45

The wavelength of photon of energy

E

is same as the de Broglie wavelength of a material particle moving with the

7.5 \times 10^{7} {ms}^{- 1}

and kinetic energy

E^{'}

. Then

\frac{E}{E^{'}}

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Gamma Question Bank for Engineering Physics>Chapter 27 - Dual Nature of Radiation and Matter>Assignment Set-2>Q 46

A silver ball of radius

4.8 cm

is suspended by a thread in the vacuum chamber. UV light of wavelength

200 nm

is incident on the ball for some times during which a total energy of

1 \times 10^{- 7} J

falls on the surface. Assuming on an average one out of

10^{3}

photons incident is able to eject electron. The potential on sphere will be

n \lor

. Value of

n

rounded off to integer, is

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Gamma Question Bank for Engineering Physics>Chapter 27 - Dual Nature of Radiation and Matter>Assignment Set-2>Q 49

An electron of mass

m

when accelerated through a potential difference

V

, has a de Broglie wavelength

λ

. The de Broglie wavelength associated with a proton of mass

M

accelerated through a potential difference

4 V

will be

\frac{λ}{n} \sqrt{\frac{m}{M}}

.

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Gamma Question Bank for Engineering Physics>Chapter 27 - Dual Nature of Radiation and Matter>Assignment Set-2>Q 50

A beam of light of flux density

30 kW / m^{2}

is incident normally on a

100 {mm}^{2}

completely absorbing screen. If

P

is the pressure exerted on the screen, then

P = 10^{- n} N / m^{2}

. Value of

n

, is

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Gamma Question Bank for Engineering Physics>Chapter 27 - Dual Nature of Radiation and Matter>Assignment>Q 4

For a photoelectric cell, the graph in figure showing the variation of the cut-off voltage

V_{0}

with frequency (v) of incident light is

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Gamma Question Bank for Engineering Physics>Chapter 27 - Dual Nature of Radiation and Matter>Assignment>Q 8

A beam of light consists of three distinct wavelengths

λ, 2 λ

and

3 λ

. The number of photons passing through unit area per unit time for three wavelengths are

n, 2 n

and

3 n

respectively. Then the intensity of the beam is

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Gamma Question Bank for Engineering Physics>Chapter 27 - Dual Nature of Radiation and Matter>Assignment>Q 9

Figure shows the graph which depicts the stopping potential $(V_{0})$ versus frequency $(V)$ of incident radiations for two metals $M_{1}$ and $M_{2}$ . Select the correct alternative.

Question Image

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Gamma Question Bank for Engineering Physics>Chapter 27 - Dual Nature of Radiation and Matter>Assignment>Q 10

A point source of constant power

P

is emitting photons of frequency

v

. What is the photon flux at a distance

r

from the source?

If work function of a metal is 3 eV and wavelength of subjected radiation to the metal is 275 nm. Then the de Broglie's wavelength (in Å) of photoelectrons emitted by the metal is nearly n. Value of n rounded off to nearest integer, is (Given hc=1240 eV nm )

Important Questions on Dual Nature of Radiation and Matter

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If work function of a metal is $3 eV$ and wavelength of subjected radiation to the metal is $275 nm$ . Then the de Broglie's wavelength (in Å) of photoelectrons emitted by the metal is nearly $n$ . Value of $n$ rounded off to nearest integer, is
(Given $h c = 1240 eV nm$ )