The work function of a metal is 4.2 , eV. If | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(C) The work function $\Phi = 4.2 \, eV = 4.2 	imes 1.602 	imes 10^{-19} \, J \approx 6.73 	imes 10^{-19} \, J$. The energy of the incident radiati

Vedclass · Accepted Answer

$3.2 	imes 10^{-19} \, J$

Vedclass · Answer

(C) The work function $\Phi = 4.2 \, eV = 4.2 	imes 1.602 	imes 10^{-19} \, J \approx 6.73 	imes 10^{-19} \, J$. The energy of the incident radiation $E = \frac{hc}{\lambda} = \frac{6.626 	imes 10^{-34} 	imes 3 	imes 10^8}{2000 	imes 10^{-10}} \, J = 9.939 	imes 10^{-19} \, J$. According to Einstein's photoelectric equation,$K_{max} = E - \Phi$. $K_{max} = (9.939 - 6.73) 	imes 10^{-19} \, J = 3.209 	imes 10^{-19} \, J$. Thus,the kinetic energy is approximately $3.2 	imes 10^{-19} \, J$.

The work function of a metal is $4.2 \, eV$. If radiation of $2000 \, \mathring{A}$ falls on the metal,then the kinetic energy of the fastest photoelectron is:

Similar Questions

When $\beta$-particles are sent through a tin metal foil,most of them go straight through the foil as

For which of the following species,Bohr's theory is not applicable?

An excited hydrogen atom emits light in the ultraviolet region at a frequency of $2.47 \times 10^{15} \ Hz$. Calculate the energy of a single photon. (Given: $h = 6.63 \times 10^{-34} \ J \cdot s$)

The magnitude of kinetic energy $(K.E.)$ of an electron in a Bohr orbit is equal to which of the following?

As an electron is brought from an infinite distance close to the nucleus of the atom,the energy of the electron-nucleus system :

Vedclass Test Series

Exam Paper Generator

Online Exam Module