The energy E of a photon and its wavelength are related by E\lambda = X. the numerical value of X is?
[h = 6.63 x 10\(^{-34}\)js, c = 3 x 10\(^8\) ms\(^{-1}\)]
A
6.6 X 10-28
B
1.99 X 10-27
C
6.60 x 10-26
D
1.99 x 10-25
Verified Correct Answer: D.
Physical Principles & Numerical Solution
E = HF = (hc)/\lambda
E\lambda = hc
∴ X = hc ==6.63 x 10\(^{-34}\) x 10\(^8\)
= 1.989 x 10\(^{-25}\)
=1.99 x 10\(^{-25}\)
Source: Myschool Past Questions Archive (Record #14012)