A laser delivers pulses of 2mJ at wavelength 633 nm with a pulse duration of 200 ps.
(hint E=h.c/l, with h=6.6 x10-34 J.s and c=3x108 m/s and 1 eV=1.6 x10-19 J)
i) How far do they travel in 1s?
ii) What is the photon energy in eV?
iii) How many photons are delivered per pulse?
& please show working out
1
Expert's answer
2011-07-08T05:14:35-0400
i) S=c*t=3*108*1=3*108 meters. ii) eV=1.6*10-19 J → J=1019/1.6 eV= 0.625*1019 eV=625*1016 eV → E=2*10-3*1016=2*1013 eV iii) energy of 1 photon is E1 = hc/λ=6.6*10-34 *3*108/633*10-9 = 31.2*10-20 J Thus n = E/E1 = 2*10-3/31.2*10-20 = 6.4*31.2*1015 particles.
Numbers and figures are an essential part of our world, necessary for almost everything we do every day. As important…
APPROVED BY CLIENTS
"assignmentexpert.com" is professional group of people in Math subjects! They did assignments in very high level of mathematical modelling in the best quality. Thanks a lot
Comments
Leave a comment