wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

A metal has a work function of 2.5×1019 J.The threshold frequency beyond which photo electrons will come out is.

A
2.3×1014 Hz
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
3.3×1014 Hz
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
2.8×1014 Hz
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
3.8×1014 Hz
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
Open in App
Solution

The correct option is D 3.8×1014 Hz

So, the work function of the metal is 2.5×1019 J.

This means that we need to give an electron a minimum of 2.5×1019 J of energy for it to come out of the metal. This energy needs to be supplied by light, in this case a photon.

Energy of a photon is hν.

So hν2.5×1019 J.

ν2.5×1019h

ν2.5×10196.626×1034

ν3.8×1014 Hz

So, the threshold frequency is 3.8×1014 Hz.


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