Home
Class 12
PHYSICS
Consider a beam of electrons (each elect...

Consider a beam of electrons (each electron with energy `E_(0))` incident on a metal surface kept in an evacuated chamber. Then

A

no electrons will be emitted as only photons can emit electrons.

B

electron can be emitted but all with an energy `E_(0)`.

C

electrons can be emitted with any energy, with a maximum of `E_(0)-phi(phi"is the work function")`.

D

electrons can be emitted with energy, with a maximum of `E_(0)`.

Text Solution

Verified by Experts

The correct Answer is:
D
(d) : when a beam of electrons of energy `E_(0)` is incident on a metal surface kept in evacuated chamber, elecrtrons can be emitted with maximum energy `E_(0)` (due to elastic collision) and with any energy less than `E_(0)`, when part of incident ebergy of electron is used in liberating electrons from the surface of metal.
Promotional Banner

Topper's Solved these Questions

  • DUAL NATURE OF RADIATION AND MATTER

    NCERT FINGERTIPS|Exercise Assertion And Reason|15 Videos

  • DUAL NATURE OF RADIATION AND MATTER

    NCERT FINGERTIPS|Exercise Higher Order Thinking Skills|8 Videos

  • CURRENT ELECTRICITY

    NCERT FINGERTIPS|Exercise Assertion And Reason|15 Videos

  • ELECTRIC CHARGES AND FIELDS

    NCERT FINGERTIPS|Exercise Assertion And Reason|15 Videos

Similar Questions

Explore conceptually related problems

The electrons are emitted in a photoelectric effect from a metal surface

When light of energy 2.5 eV falls on a metal surface, the maximum K.E. of the emitted electrons is T. If the radiation of energy 4eV is made incident on the same metal surface, the K.E. of the electrons is doubled. What is the work function of the metal ?

Two beams one of red light and other of blue light of the same intensity are incident on a metallic surface to emit photoelectrons. Which one of the two beam emits electrons of greater kinetic energy?

Statement 1: Though light of a single frequency (monochromatic light) is incident on a metal, the kinetic energies of emitted photoelectrons are not equal. Statement 2: The energy of electrons just after they absorb photons incident on metal surface may be lost in collision with other atoms in the metal before the electron is ejected out of the metal.

Statement-1: The photoelectrons produced by a monochromatic light beam incident on a metal surface have a spread in their kinetic energies. Statement-2: The work function of the metal varies as a function of depth form the surface.

In each of the following questions, a statement is given and a corresponding statement or reason is given just below it. In the statement, mark the correct answer as Statement-I: Though light of a single frequency (monochromic light) is incident ona metal, the energies of emitted photoelectrons are different Statement-II: The energy of electrons just after they absorb photons incident on the metal surface may be lost in collision with other atoms in the metal before the electron is ejected out of the metal.

In a photoelectric effect experiment , photons of energy 5 eV are incident on metal surface . They liberate electrons which are just stopped by an electrode at a potential of 3.5 V with respect to metal . The work function of the metal surface in eV is :

If we go on increasing the wavelength of light incident on a metal surface, what change in the number of electrons and the energy take place?