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Chapter 33: Q4P (page 1001)
About how far apart must you hold your hands for them to be separated by (the distance light travels in)?
One nano light second is equal to .
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In Fig. 33-41, unpolarized light is sent into a system of two polarizing sheets. The anglesof the polarizing directions of the sheets are measured counterclockwise from the positive direction of the y-axis (they are not drawn to scale in the figure). The angle is fixed but the angle can be varied. Figure 33-45 gives the intensity of the light emerging from sheet 2 as a function of . (The scale of the intensity axis is not indicated.) What percentage of the light鈥檚 initial intensity is transmitted by the two-sheet system when?
a.
b.
An isotropic point source emits light at wavelength, at the rate of. A light detector is positionedfrom the source. What is the maximum rate at which the magnetic component of the light changes with time at the detector鈥檚 location?
Question: (a) How long does it take a radio signal to travel from a transmitter to a receiving antenna? (b) We see a full Moon by reflected sunlight. How much earlier did the light that enters our eye leave the Sun? The Earth鈥揗oon and Earth鈥揝un distances are and , respectively. (c) What is the round-trip travel time for light between Earth and a spaceship orbiting Saturn, distant? (d) The Crab nebula, which is about light years (ly) distant, is thought to be the result of a supernova explosion recorded by Chinese astronomers in A.D. 1054. In approximately what year did the explosion actually occur? (When we look into the night sky, we are effectively looking back in time.)
(a) Show that Eqs. 33-1 land 33-2 satisfy the wave equations displayed in Problem 108. (b) Show that any expressions of the form and , where denotes an arbitrary function, also satisfy these wave equations.
An airplane flying at a distance offrom a radio transmitter receives a signal of intensity.(a) What is the amplitude of the electric component of the signal at the airplane and (b) What is the amplitude of the magnetic component of the signal at the airplane? (c) If the transmitter radiates uniformly over a hemisphere, what is the transmission power?
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