Home
Class 12
PHYSICS
Light of frequency 7.21xx10^(14) Hz is i...

Light of frequency `7.21xx10^(14)` Hz is incident on a metal surface. Electrons with a maximum speed of `6xx10^(5)m" "s^(-1)` are ejected from the surface. The threhold frequency for photoemission of electrons is threshold frequency for photoemission of electrons is
`("Given h"=6.63xx10^(-34)Js,m_(e)=9.1xx10^(-31)kg)`

A

`4.74 xx10^(14)Hz`

B

`5.74xx10^(15)Hz`

C

`6.84xx10^(13)Hz`

D

`4.84xx10^(14)Hz`

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Similar Questions

Explore conceptually related problems

Light of frequency 7.21xx10^(14)Hz is incident on a metal surface. Electrons with a maximum speed of 6.0xx10^(5)ms^(-1) are ejected from the surface. What is the threshold frequency for photoemission of electrons? h=6.63xx10^(-34)Js, m_(e)=9.1xx10^(-31)kg .

Light of frequency 7.21xx10^(14)Hz is incident on a metal surface. Electrons with a maximum speed of 6.0xx10^(5)ms^(-1) are ejected from the surface. What is the threshold frequency for photoemission of electrons? h=6.63xx10^(-34)Js, m_(e)=9.1xx10^(-31)kg .

The de Broglie wavelength of an electron with kinetic energy 120 e V is ("Given h"=6.63xx10^(-34)Js,m_(e)=9xx10^(-31)kg,1e V=1.6xx10^(-19)J)

What is the binding energy (in J/mol or kJ/mol) of an electron in a metal, whose threshold frequency for photoelectron is 3.5 xx 10^(13) s^(-1) ?

If de Broglie wavelength of an electron is 0.5467 Å, find the kinetic energy of electron in eV. Given h=6.6xx10^(-34) Js , e= 1.6xx10^(-19) C, m_e=9.11xx10^(-31) kg.

Molar mass of electron is nearly : (N_(A) = 6 xx 10^(23)) , mass of e^(-) = 9.1 xx 10^(-31)Kg

If an electron has an energy such that its de Broglie wavelength is 5500 Å , then the energy value of that electron is (h= 6.6 xx 10^(-34)) Js, m_( c) = 9.1 xx 10^(-31) kg

With what velocity must an electron travel so that its momentum is equal to that of a photon with a wavelength of 5000Å(h=6.6 xx 10^(-34)Js,m_(e)=9.1 xx 10^(-31) Kg)

Calculate the (a) momentum and (b) de-Broglie wavelength of the electrons accelerated through a potential difference of 56V. Given, h=6.63xx10^(-34)Js, m_(e)=9.1xx10^(-31)kg, e=1.6xx10^(-19)C .