Dear
classmates... solve the following exercises and send them at 20:00 h., to the
following email address
jose.gogu@outlook.com
- A microwave oven emits
700 W of radiation at a frequency of 2.45 GHz. How
many photons does it generate per second?
- The filament of a 60 W
incandescent light bulb has a temperature of 3300 K.
a. Assume the
filament is an ideal blackbody and determine the peak wavelength of its
spectrum.
b. Assume the peak
wavelength is equal to the mean wavelength of the visible photons emitted and
determine the number of photons emitted per second.
- The world's most powerful laser
is the Petawatt at Lawrence Livermore National
Laboratory in California. At full energy of about 680 joules, the shots
delivered by the Petawatt last a mere 440 femtoseconds. The resulting
rapid dump of energy when applied to a small space is sufficient to knock
neutrons loose from medium sized nuclei like gold or to split heavier
nuclei like uranium in two. When applied to light nuclei like hydrogen,
the power of the Petawatt could be used to initiate nuclear fusion (the
process that powers the sun) in reactors on earth.
What is the power of the Petawatt
beam?
What is the energy per photon
assuming a wavelength of 1057 nm?
How many photons are delivered
per shot?
Have a nice afternoon
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