An observer at the ground hears thunder 10 safter he sees a lightning flash, and the thunderlasts for 8 s. How far is the observer from theclosest point of the lightning flash and what isthe minimum length of the flash? Under whatconditions would the length of the flash youhave calculated be equal to the true length?(Speed of sound is 0.34 km s-1.)

From basic physics we know, distance=speed x time. Here, let distance of the observer from the…

Answered: An observer at the ground hears thunder…

University Physics Volume 3

17th Edition

ISBN:9781938168185

Author:William Moebs, Jeff Sanny

Publisher:William Moebs, Jeff Sanny

Chapter5: Relativity

Section: Chapter Questions

Problem 13CQ: All galaxies farther away than about exhibit a red shift in their emitted light that is proportional...

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A highway patrol officer uses a device that measures the speed of vehicles by bouncing radar off them and measuring the Doppler shift. The outgoing radar has a frequency of 100 GHz and the returning echo has a frequency 15.0 kHz higher. What is the velocity of the vehicle? Note that there are two Doppler shifts in echoes. Be certain not to round off until the end of the problem, because the effect is small.
All galaxies farther away than about exhibit a red shift in their emitted light that is proportional to distance, with those farther and farther away having progressively greater red shifts. What does this imply, assuming that the only source of red shift is relative motion?
Show that the wave equation in one dimension 2fx2=1v22ft2 Is satisfied by any doubly differentiable function of either the form f(x — vt) or f(x + vt).
then If you stood at the same point on a cold day were T2 = -7.5 °C how long is have taken for you to hear the echo in s?
A physicist at a July fireworks display has a stopwatch. She times the lag between when she sees the flash and when she hears it at 0.55 s. The temperature in July is 25 °C. (a) Can the finite speed of light be neglected for this problem? Show quantitatively. (b) How distant is the firework from the physicist? (c) In December, when the air temperature is -10 °C, what lag time will she measure?
If you stood at the same point on a cold day were T2 = -7.5 °C how long is have taken fou u to hear the echo in s?
An airborn radar of an airoplane has a pulse width of 5µ sec, at a vertical height of1nautical mile,A. find the lateral ground distance on earth to land,B. find the angle to be maintained for proper landing with above values.
Events 1 and 2 are exploding firecrackers that each emit light pulses. In the reference frame of the detector, event 1 leaves a char mark at a distance 3.40 m from the detector, and event 2 leaves a similar mark at a distance 2.10 m from the detector. If the two events are simultaneous in the reference frame of the detector and occur at instant t = 0, at what instant of time will each light pulse be detected?
calculate the reverberation time at 500hz for a conference room that is 12 ft wide, 20 ft long and 12 ft high. It has a carpeted floor, curtains on both sides, plasterboard (or equivalent) short sides, and a plasterboard ceiling. what will the reverberation tiume be if it is occupied by twenty people in comfortable upholstered seats?
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Radio-controlled clocks throughout the United States receivea radio signal from a transmitter in Fort Collins, Colorado,that accurately (within a microsecond) marks the beginningof each minute. A slight delay, however, is introducedbecause this signal must travel from the transmitter to theclocks. Assuming Fort Collins is no more than 3000 km fromany point in the U.S., what is the longest travel-time delay?

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