CameraIcon
CameraIcon
SearchIcon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

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

A
220 nm
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
310 nm
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
C
400 nm
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
540 nm
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is B 310 nm
Work function of metallic substance ϕ=4.0 eV
For photoelectric effect to take place, minimum energy of the incident photon must be equal to the work function of metal surface i.e. Emin=ϕ
hcλmax=ϕ
Or λmax=hcϕ
Or λmax=1240ϕ (in eV) nm
λmax=12404=310 nm

flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Hertz's Observations
PHYSICS
Watch in App
Join BYJU'S Learning Program
CrossIcon