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IMPORTANT

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The number of photons falling per second on a completely darkened plate to produce a force of $6.62 \times 10^{- 5} N$ is $n$ . If the wavelength of the light falling is $5 \times 10^{- 7} m,$ then $n =$ . Take plank constant. $(h = 6.62 \times 10^{- 34} J - s)$

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Important Questions on Electrons and Photons

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MHT-CET

IMPORTANT

MHT-CET TRIUMPH Physics Multiple Choice Questions Part - 2 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 11 - Electrons and Photons>Competitive Thinking>Q 74

Photoelectric emission is observed from a metallic surface for frequencies

v_{1}

and

v_{2}

of the incident light rays

(v_{1} > v_{2}) .

If the maximum values of kinetic energy of the photoelectrons emitted in the two cases are in the ratio of

1 : K

then the threshold frequency of the metallic surface is

HARD

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IMPORTANT

MHT-CET TRIUMPH Physics Multiple Choice Questions Part - 2 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 11 - Electrons and Photons>Competitive Thinking>Q 75

A photoelectric surface is illuminated successively by monochromatic light of wavelength

λ

and

\frac{λ}{2} .

If the maximum kinetic energy of the emitted photoelectrons in the second case is

3

times that in the first case, the work function of the surface of the material is:

(h = Planck' s constant, c = speed of light)

HARD

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IMPORTANT

MHT-CET TRIUMPH Physics Multiple Choice Questions Part - 2 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 11 - Electrons and Photons>Competitive Thinking>Q 76

Two identical photo-cathodes receive the light of frequencies

f_{1}

and

f_{2} .

If the velocities of the photoelectrons (of mass

m

) coming out are

v_{1}

v_{2}

and

v_{2}

respectively, then

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MHT-CET

IMPORTANT

MHT-CET TRIUMPH Physics Multiple Choice Questions Part - 2 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 11 - Electrons and Photons>Competitive Thinking>Q 77

The figure shows a plot of photo current versus anode potential for a photo sensitive surface for three different radiations. Which one of the following is a correct statement? Question Image

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IMPORTANT

MHT-CET TRIUMPH Physics Multiple Choice Questions Part - 2 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 11 - Electrons and Photons>Competitive Thinking>Q 80

Light of wavelength

λ_{A}

and

λ_{B}

Falls on two identical metal plates $A$ and $B$ respectively. The maximum kinetic energy of photoelectrons is

K_{A}

and

K_{B}

Respectively, then which one of the following relations is true?

(λ_{A} = 2 λ_{B})

MEDIUM

MHT-CET

IMPORTANT

MHT-CET TRIUMPH Physics Multiple Choice Questions Part - 2 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 11 - Electrons and Photons>Competitive Thinking>Q 81

The energy of the em waves is of the order of

15 keV .

To which part of the spectrum does it belong ?

EASY

MHT-CET

IMPORTANT

MHT-CET TRIUMPH Physics Multiple Choice Questions Part - 2 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 11 - Electrons and Photons>Competitive Thinking>Q 1

Relation between the stopping potential

V_{0}

of a metal and the maximum velocity of the photoelectrons is

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MHT-CET

IMPORTANT

MHT-CET TRIUMPH Physics Multiple Choice Questions Part - 2 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 11 - Electrons and Photons>Evaluation Test>Q 2

Radiation of wavelength

120 nm

ejects photoelectrons from a plate whose work function is

3.0 eV .

If a magnetic field of flux density

4.0 \times 10^{- 5} T

is applied parallel to the plate, then the radius of the path followed by electrons ejected normally from the plate with maximum energy will be

The number of photons falling per second on a completely darkened plate to produce a force of 6.62×10-5 N is n. If the wavelength of the light falling is 5×10-7m, then n=. Take plank constant. h=6.62×10-34J-s

Important Questions on Electrons and Photons

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The number of photons falling per second on a completely darkened plate to produce a force of $6.62 \times 10^{- 5} N$ is $n$ . If the wavelength of the light falling is $5 \times 10^{- 7} m,$ then $n =$ . Take plank constant. $(h = 6.62 \times 10^{- 34} J - s)$