Question
Chemistry Question on Gibbs Free Energy
Choose the correct answer :
1. The minimum energy that must be possessed by photons in order to produce the photoelectric effect with platinum metal is
[Given The threshold frequency of platinum is 1.3 × 1015 s–1 and h = 6.6 × 10–34 Js.]
A
3.21 × 10–14 J
B
6.24 × 10–16 J
C
8.58 × 10–19 J
D
9.76 × 10–20 J
Answer
3.21 × 10–14 J
Explanation
Solution
The correct option is(C): 8.58 × 10–19 J.
The minimum energy possessed by photons will be equal to the work function of the metal.
Hence,
w0 = hν0
= 6.6 × 10–34 × 1.3 × 1015
= 8.58 × 10–19 J.