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Chapter Questions
Find the distance (in metres) traveled by a radio wave in $21.5 \mathrm{h}$.
A radar wave that is bounced off an airplane returns to the radar receiver in $3.78 \times 10^{-5}$ s. How far (in miles) is the airplane from the radar receiver?
How long does it take for a police radar beam to travel to a car and back if the car is $0.245 \mathrm{mi}$ from the radar unit?
How long does it take for a pulse of laser light to return to a police speed detector after bouncing off a speeding car 0.274 mi away?
How long does it take for a radio signal to travel from the earth to a communications satellite 22,500 mi above the surface of the earth?
Find the wavelength of a radio wave from an AM station broadcasting at a frequency of $1230 \mathrm{kHz}$.
Find the frequency of a radio wave if its wavelength is $46.5 \mathrm{m}$.
Find the frequency of a light wave if its wavelength is $5.415 \times 10^{-8} \mathrm{m}$.
What is the energy of a photon with frequency $1.45 \times 10^{11} \mathrm{Hz} ?$
What is the frequency of a photon with energy of $4.75 \times 10^{-23} \mathrm{J} ?$
What is the energy of a photon with frequency $8.25 \times 10^{-15} \mathrm{Hz}$ ?
Find the intensity of the light source necessary to produce an illumination of $3.75 \mathrm{ft}$ candles at $6.75 \mathrm{ft}$ from the source.
Find the intensity of the light source necessary to produce an illumination of 4.86 lux at $9.25 \mathrm{m}$ from the source.
What is the intensity of the light source required to produce the illumination of Problem 13 if the distance from the light source is doubled?
What are the maximum and minimum transit times for light traveling from Jupiter to Mars? The orbital radii are 215 million kilometres for Mars and 725 million kilometres for Jupiter. Assume the planetary orbits are circular. Also make the (nonphysical) assumption that the sun is transparent to the transmission of light between the planets.
Find the intensity of two identical light sources located $0.454 \mathrm{m}$ and $0.538 \mathrm{m},$ respectively, from a point where the illumination is $8.46 \mathrm{em} / \mathrm{m}^{2}$.
Find the illumination on a surface by three light sources, each with intensity $125 \ell \mathrm{m},$ located at $1.85 \mathrm{m}, 1.92 \mathrm{m},$ and $2.43 \mathrm{m}$ from the surface, respectively.