A light source emits a beam of photons, each of which has a momentum of 1.3 × 10-29 kg·m/s. (a) What is the frequency of the photons? (b) To what region of the electromagnetic spectrum do the photons belong?
SOLUTION :
(a)
p = h/lambda
lambda = c / v
p = h v / c
v = p c / h
v = (1.3 x 10^-29 x 3 x 10^8) / (6.62 x 10^-34)
v = 0.5891238670694 x 10^13 Hz
(b) v = 10^13 ranges in "infrared region" (approx 10^12 to 10^14)
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