A police officer's radar gun emits radio waves at a frequency of 11.9 GHz. What is the difference in the frequencies reflected back to the radar gun by a car traveling at the 45 mph speed limit and a car travelling 1 mph faster? Assume that the cars are both headed directly away from the stationary officer. 35.54 difference between frequencies: Hz Incorrect

A police officer's radar gun emits radio waves at a frequency of 11.9 GHz. What is the difference in the frequencies reflected back to the radar gun by a car traveling at the 45 mph speed limit and a car travelling 1 mph faster? Assume that the cars are both headed directly away from the stationary officer. 35.54 difference between frequencies: Hz Incorrect

Glencoe Physics: Principles and Problems, Student Edition

1st Edition

ISBN:9780078807213

Author:Paul W. Zitzewitz

Publisher:Paul W. Zitzewitz

Chapter25: Electromagnetic Induction

Section: Chapter Questions

Problem 95A

See similar textbooks

Similar questions

Radio station WWVB, operated by the National Institute of Standards and Technology (NIST) from Fort Collins, Colorado, at a low frequency of 60 kHz, broadcasts a time synchronization signal whose range covers the entire continental US. The timing of the synchronization signal is controlled by a set of atomic clocks to an accuracy of 101012 s, and repeats every 1 minute. The signal is used for devices, such as radio-controlled watches, that automatically synchronize with it at preset local times. WWVB's long wavelength signal tends to propagate close to the ground. (a) Calculate the wavelength of the radio waves from WWVB. (b) Estimate the error that the travel time of the signal causes in synchronizing a radio controlled watch in Norfolk, Virginia, which is 1570 mi (2527 km) from Fort Collins, Colorado.
A radio station broadcasts its radio waves with a power of 50,000 W. What would be the intensity of this signal if it is received on a planet orbiting Proxima Centuri, the closest star to our Sun, at 4.243 ly away?
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.
While driving at a constant speed of 79 km/h, you are passed by a car traveling at 122 km/h. If the frequency of light emitted by the taillights of the car that passes you is 4.3 1014 Hz, what frequency will you observe? (Use c = 2.9979245 ✕ 108 m/s Enter your answer to at least eight significant figures.) Whats the change in fequency?
A speeder tries to explain to the police that the yellow warning lights she was approaching on the side of the road looked green to her because of the Doppler shift. How fast would she have been traveling if yellow light of wavelength 576.6 nm had been shifted to green with a wavelength of 562.3 nm? Note: For speeds less than 0.03c, the equation below will lead to a value for the observed frequency accurate to approximately two significant digits. fO ≈ fS (1 ± u/c) if u < c what is the frequency in m/s?
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?
What is the wavelength, in fm (femtometers, or 10^-15 m), of a proton travelling at 90% of the speed of light?
At what speed must a human weighing 150.0 lb be traveling in order to have a wavelength at 650 nm?
Astronomers determine that a particular star in our galaxy is moving toward Earth at a speed of 716.0 km/s with respect to the Earth. If Earth receives a wavelength ? = 689.6 nm from this star, what was the wavelength emitted by the star?
A speeder tries to explain to the police that the yellow warning lights she was approaching on the side of the road looked green to her because of the Doppler shift. How fast would she have been traveling if yellow light of wavelength 576.6 nm had been shifted to green with a wavelength of 562.3 nm? Note: For speeds less than 0.03c, the equation below will lead to a value for the observed frequency accurate to approximately two significant digits. answer in m/s
A FM radio station broadcasts with a wavelength of 2.85 m, what frequency can you find them on your radio dial in MHz?
Assume (unrealistically) that a TV station acts as a point source broadcasting isotropically at 1.0 MW.What is the intensity of the transmitted signal reaching Proxima Centauri, the star nearest our solar system, 4.3 ly away? (An alien civilization at that distance might be able to watch X Files.) A light-year (ly) is the distance light travels in one year.