Consider figure for photoemission. How would you reconcile with momentum-conservation ? Note light (

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11.Dual Nature of Radiation and matter

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Consider figure for photoemission.

How would you reconcile with momentum-conservation ? Note light (photons) have momentum in a different direction than the emitted electrons.

Option A

Option B

Option C

Option D

Solution

When incident photon is absorbed completely, its momentum becomes zero. This momentum is gained by atoms of metal and so these atoms get excited. As a result, electrons in them, transit from lower to higher energy levels and along with this, some free electrons get emitted in the form of photoelectrons. Here, total momentum is definitely conserved, irrespective of type of collision.

Standard 12

Physics

The energy of a photon of light of wavelength $450 nm$ is

easy

A $100\,watt$ light source is emitting radiations of wavelength $5000\,\mathop A\limits^o $. The rate of emission of photons is of the order of

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The energy of a photon of wavelength $\lambda $ is given by

easy

(AIPMT-1988)

Find the number of photons emitted per second by a $25$ watt source of monochromatic light of wavelength $6600 \mathring A$. What is the photoelectric current assuming $3 \%$ efficiency for photoelectric effect?

easy

The velocity of photon is proportional to (where $v$ is frequency)

easy

Consider figure for photoemission. How would you reconcile with momentum-conservation ? Note light (photons) have momentum in a different direction than the emitted electrons.

Solution

Similar Questions

The energy of a photon of light of wavelength $450 nm$ is

A $100\,watt$ light source is emitting radiations of wavelength $5000\,\mathop A\limits^o $. The rate of emission of photons is of the order of

The energy of a photon of wavelength $\lambda $ is given by

Find the number of photons emitted per second by a $25$ watt source of monochromatic light of wavelength $6600 \mathring A$. What is the photoelectric current assuming $3 \%$ efficiency for photoelectric effect?

The velocity of photon is proportional to (where $v$ is frequency)

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Consider figure for photoemission.

How would you reconcile with momentum-conservation ? Note light (photons) have momentum in a different direction than the emitted electrons.