Fusion is the process by which the sun produces energy. One experimental techniq
ID: 2186801 • Letter: F
Question
Fusion is the process by which the sun produces energy. One experimental technique for creating controlled fusion utilizes a solid-state laser that emits a wavelength of 1060 nm and can produce a power of 1.00 x 1014 W for a pulse duration of 1.10 x 10-11 s. In contrast, the helium/neon laser used at the checkout counter in a bar-code scanner emits a wavelength of 633 nm and produces a power of about 1.00 x 10-3 W. How long (in days) would the helium/neon laser have to operate to produce the same number of photons that the solid-state laser produces in 4 pulse(s)?Explanation / Answer
for solid state laser
=1060 nm = 1060*10-9 m
energy of 1 photon = hc/ = 1.8753*10-19 J
number of photons in 1 pulse = power produced*time/energy of 1 photon = 1*1014 * 1.1*10-11/1.8753*10-19
=5.8657*1021
number of photons in 7 pulses = 4.106*1022
now for neon laser
=633 nm = 633*10-9 m
energy of 1 photon = hc/ = 3.14032*10-19 J
since number of photons=P*t/energy of 1 photon
=>4.106*1022 =10-3*t/ 3.14032*10-19 => t=12894153.92 s = 149.24 days Ans.
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