Home
Class 12
PHYSICS
The work function of a substance is 4.0...

The work function of a substance is ` 4.0 eV`. The longest wavelength of light that can cause photo-electron emission form this substance is approximately :

A

540 nm

B

400 nm

C

310 nm

D

220 nm

Text Solution

Verified by Experts

The correct Answer is:
C
`phi_(0)=4eV =(hc)/(lambda_(0))`
`rArr lambda_(0)=(6.6 xx 10^(-34)xx3xx10^(8))/(4xx1.6 xx 10^(-19))=3100Å=310 nm`
Promotional Banner

Similar Questions

Explore conceptually related problems

The work functio of a substance is 4.0 eV . The longest wavelength of light that can cause photoelectron emission form this substance is approximately :

The work function of a substance is 4.0 eV. The longest wavelength of light that can cause photoelectron emission from this substance is approximately equal to

The work function of a substance is 4.0 eV. The longest wavelength of light that can cause photoelectron emission from this substance is approximately. (a) 540 nm (b ) 400nm (c ) 310 nm (d) 220 nm

The work function of a substance is 4.0 eV The longest wavwlength of light that can cause photoelectron emission from this substance is approximately

The work function of a substance is 4.0 eV The longest wavwlength of light that can cause photoelectron emission from this substance is approximately

The work function of a substance is 3.68 eV. The longest wavelength of light that can cause photoelectrons emission from this substance is approximately

The work function of a substance is "3.0eV" .The longest wavelength of light that can cause the emission of photoelectrons from this substance is approximately:

The work function of a substance is 1.6 ev. The longest wavelength of light that can produce potoemisson form the substance is