Physics - General Knowledge Questions and Answers

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The energy of a photon varies directly with its

Wave length

Frequency

Speed

None of the above

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A photon of X-ray has energy of 1 keV. A photon of visible radiation has energy of 3 eV. In this context, which one of the following statements is not correct?

The wavelength of X-ray photon is less than the wavelength of visible radiation photon.

Both the photons have different energies.

The speeds of both the photons in vacuum are different

The frequency of X-ray photon is higher than the frequency of visible radiation photon.

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The threshold frequency is the frequency below which :

Photo current increases with voltage

Photo current decreases with voltage

Photo electric emission is not possible

Photo current is constant

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Which of the following supports particle nature of photons ?

Diffraction

Polarization

Photoelectric effect

Interference

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The reverse effect of X–ray emission is

Raman effect

Compton effect

Zeeman effect

Photoelectric

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The term photon refers to

Light ray

Sub atomic particle

Radiation

None of the above

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In a conductor

There is no conduction band

The forbidden energy gap is very wide

The forbidden energy gap is very narrow

The valence band and the conduction band overlap each other

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The unit of intensity of electric field is

N/c

N/m

J/c

Volt

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. . . . . . . . . exerts a force on anything that has an electric charge.

Electric field

Electrostatic force

Inductive field

All of the above