In a photoelectric experiment, the wavelength of the light incident on a metal is changed from 300 nm to 400 nm. The decrease in the stopping potential is close to :
a.
0.5 V
b.
1.0 V
c.
2.0 V
d.
1.5 V
a.
0.5 V
b.
1.0 V
c.
2.0 V
d.
1.5 V
Question ID - 50599 | SaraNextGen Top Answer In a photoelectric experiment, the wavelength of the light incident on a metal is changed from 300 nm to 400 nm. The decrease in the stopping potential is close to :
a.
0.5 V
b.
1.0 V
c.
2.0 V
d.
1.5 V
In a photoelectric experiment, the wavelength of the light incident on a metal is changed from 300 nm to 400 nm. The decrease in the stopping potential is close to :
|
a. |
0.5 V |
b. |
1.0 V |
|
c. |
2.0 V |
d. |
1.5 V |
1 Answer
127 votes
Answer Key / Explanation : (b) -
= 
+ eV1 …… (i)
= 
+ eV2 …… (ii)
(i) − (ii)
hc
=e(V1 − V2)
⇒ V1 − V2 = 
= (1240nm − V )
= 1V
127 votes
Answer Link
127