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Photon Flashcards

(11 cards)

1
Q

Photoelectric effect

A

emission of a electron when a ray of light falls into the metal surface.

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2
Q

Threshold frequency

A

the minimum frequency of incident radiation required to eject the electron from the metal surface. Doesnot depend on the intensity of a light.Denoted by fnod

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2
Q

Photoelectric emission

A

The process of ejection of electron from its metal surface.

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3
Q

Photoelectric equation normal,in terms of stooping potential and work function.

A

E=hf
hf=hfnod+eVnod
In terms of stooping potential
hf=hfnod- (φ)

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3
Q

Stooping potential

A

minimum retarding potential applied at anode at which the photoelectric current becomes zero.Denoted by Vnod.

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4
Q

Work function

A

minimum energy required to eject a electron from a metal surface without imparting any KE onto it.

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5
Q

Does K.E or fnod (threshold frequency) depend on the intensity of light?

A

No because these both terms depend upon the frequency of light rather than intensity of light.

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6
Q

In which reason does the Photoelectric current is greater infrared or ultraviolet? why does in uv region it can cause severe burns.

A

Ultraviolet because as we know
E=hf , E = h c / λ and λIR> λuv.

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7
Q

If the wavelength is doubled what happens to the energy of the photons?

A

reduced to half.

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8
Q

What happens to the no of electrons if wavelength is increased?

A

nothing.No of electrons depend upon the intensity of light not wavelength.

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9
Q

Formulas

A

hf=hfnod+K.E
Φnod=hfnod
6.4x10^18 to change joule into eV.

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