Chapter: Dual nature of radiation and matter

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The theory, on the basis of Photoelectric effect can be explained:

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Corpusculartheory

Wave theory

Electromagnetic theory

Quantum theory

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When radiation of given frequency is incident upon different metals, the maximum kinetic energy of electrons emitted–

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decrease with increase of work function

increase with increase of work function

remains same with the increase of workfunction

does not depend upon workfunction

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A proton,a neutron,an electron and alpha particle have same kinetic energy,then their de-Broglie wavelengths compare as

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λe = λp= λn= λa

λe>λp>λn>λa

λp =λn&λe>λa

λa<λp<λn<λe

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Which of the following has maximum stopping potential when metal is illuminated by visible light?

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Blue

Yellow

Violet

Red

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Maximum kinetic energy of emitted electron depends on the frequency of incident photon when frequency of incident photons is

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equal to the threshold frequency

half of threshold frequency

greater then threshold frequency

one third of threshold frequency

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Two particles have equal momentum. What is the ratio of their de-Broglie wavelength?

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2:1

1:1

1:3

1:2

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Light of frequency 1.9 times the threshold frequency is incident on a photosensitive material. If the frequency is halved and intensity is doubled, the photo current becomes

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quadrupled

doubled

halved

zero

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Threshold wavelength for a metal having work function W0 is λ What is the threshold wavelength for the metal having work function 2W0?

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4λ

λ/2

3λ

2λ

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Radiations of frequency v are incident on a photosensitive metal. The maximum K.E. of the photo electrons is E. When the frequency of the incident radiation is doubled, what is the maximum kinetic energy of the photo electrons?

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E + hv

E - hv

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A proton and an α-particle are accelerated by the same potential difference. The ratio of their de-broglie wavelengths (λp, λα) is

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√8

1/√8

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According to Einstein’s photoelectric equation the plot of the kinetic energy of the emitted photo-electrons from a metal vs the frequency of the incident radiation gives a straight line whose slope

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depends on the nature of the metal used.

depends on the intensity of the radiation.

depends both on the intensity of the radiation and the metal used.

is the same for all metals and independent of the intensity of the radiation.

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For a given kinetic energy which of the following has smallest de Broglie wavelength?

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Electron

Proton

Deutron

a-particle

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particle is dropped from a height h. The de Broglie wavelength of the particle as a function of height is proportional to

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1/√h

√h

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A Proton and an a-particle have the same de Broglie wavelength. What is same for both of them?

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Mass

Energy

Frequency

Momentum

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The maximum kinetic energy of emitted photo electrons is independent of----------of incident radiation.

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Photoelectric emission is an __________ process.

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De Broglie wavelength associated with an electron beam accelerated through a potential difference V is __________ proportional to √V.

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__________ is the minimum amount of energy required to cause photoelectric emission.

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Name the phenomenon which shows the quantum nature of electromagnetic radiation.

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What is the rest mass of a photon?

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