Modern Physics For Scientists And Engineers
Modern Physics For Scientists And Engineers
2nd Edition
ISBN: 9781938787751
Author: Taylor, John R. (john Robert), Zafiratos, Chris D., Dubson, Michael Andrew
Publisher: University Science Books,
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Chapter 4, Problem 4.8P
To determine

(a)

The energy of typical microwave photons.

To determine

(b)

The wavelength of the radiation.

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(a) How many minutes does it take a photon to travel from the Sun to the Earth? min (b) What is the energy in ev of a photon with a wavelength of 478 nm? ev (c) What is the wavelength (in m) of a photon with an energy of 1.03 eV?
(a) How many minutes does it take a photon to travel from the Sun to the Earth? 8.32 It can be useful to remember that light travels from the Sun to Earth in about 8.32 minutes. min (b) What is the energy in eV of a photon with a wavelength of 628 nm? 1.98 eV (c) What is the wavelength (in m) of a photon with an energy of 1.13 eV? 1.76*10**-6
The most energetic electromagnetic waves in the universe are gamma-rays from gamma ray bursts (GRBs) from collapsing massive stars, observed by satellites with expected energies of 100 TeV (1 TeV = 1012eV). (a) (10) What is the frequency of these energetic gamma ray photons? 1 eV = 1.60 x 10-19 J. (b)  What is the wavelength? 2. An astronaut on the International Space Station (ISS) is experimenting with a solid-state green laser communications system from on-orbit at 435 km altitude to the earth’s surface with a wavelength of 532nm and beam divergence (width) of 10-6 radians or 5.73 x 10-15° << 1°. The indices of refraction in free space and the atmosphere are n0 o 1.00000 ..., and na = 1.000293. Although density in the atmosphere varies continuously from the thinness of the upper atmosphere (near r ® 0) to higher density at the surface, refraction can be modeled as a ‘surface’ mid-atmosphere just like classic Snell’s Law calculations. (a)  When the ISS is directly…
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