Question # 1

G.P Thomson revealed:

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Particle nature of electron

Dual nature of electron

Wave nature of electron

Electromagnetic nature of electron

Interference and diffraction of light confirms its:

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Particle nature

Dual nature

Wave nature

Electromagnetic nature

Moving photons posses:

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Energy

Momentum

Wavelength

All of these

Joule-second is the unit of:

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Energy

Heat

Planck’s constant

None of these

The reverse process of photo-electric effect is called:

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Pair production

Compton effect

Annihilation of matter

X-rays

J.J Thomson finds:

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Particle nature of the electron

Dual nature of electron

Wave nature of electron

Electromagnetic nature of electron

In photoelectric effect, electrons are emitted:

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Slowly

Intermittently

Both (a) & (b)

Instantly

A human eye can detect the electromagnetic radiations of the type:

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Infrared radiations

For- infrared radiations

X-rays radiations

Red radiations

Rest mass energy of electron is:

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1.02 MeV

0.51 MeV

931 MeV

200 MeV

Interference and diffraction confirm:

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Particle nature

Wave nature

Dual nature

None of these

A.H Compton studied the scattering of X-rays by loosely bound electrons from a graph target in:

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1905

1911

19251

1923

Diffraction pattern has also been observed for:

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Proton

Neutron

Hydrogen atom

All of them

The maximum energy of the photoelectrons can be determined by making the:

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Anode positive

Anode negative

Cathode positive

Both (b) & (c)

In a photocell, sodium and potassium emit electrons for:

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Visible light

Infrared light

Ultraviolet light

All of these

In photoelectric effect, electrons are emitted with:

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Same energy

Different energies

Both (a) & (b)

Intermittent energies

Photoelectric effect and Compton effect prove the:

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Wave nature of light

Particle nature of light

Dual nature of light

The stopping potential for a certain metal is 10 volt, the max. Energy of emitted electron is:

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10 J

100 J

1.6 × 10-18 J

1.6 × 10-19 J

Potassium cathode in photocell emits electrons for a light:

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Visible

Infrared

Ultraviolet

X-rays

The photoelectric effect was explained by:

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Einstein

Davison

Hertz

Planck

The dimensions of Planck’s constant “h” are same as that of:

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Momentum

Angular momentum

Work

Torque

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