force on a second object, the second object exerts a force on the first that is opposite in direction and equal in magnitude at the same time. in the same direction and equal in magnitude a moment later. opposite in direction and greater in magnitude at the same time. in the same direction and weaker in magnitude a moment later. O o o

force on a second object, the second object exerts a force on the first that is opposite in direction and equal in magnitude at the same time. in the same direction and equal in magnitude a moment later. opposite in direction and greater in magnitude at the same time. in the same direction and weaker in magnitude a moment later. O o o

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter24: Electromagnetic Waves

Section: Chapter Questions

Problem 25PE: Conversations with astronauts on lunar walks had an echo that was used to estimate the distance to...

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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.
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Conversations with astronauts on lunar walks had an echo that was used to estimate the distance to the Moon. The sound spoken by the person on Earth was transformed into a radio signal sent to the Moon, and transformed hack into sound on a speaker inside the astronaut’s space suit. This sound was picked up by the microphone in the space suit (intended tor the astronaut’s voice] and sent back to Earth as a radio echo of sorts. If the round-trip time was 2.60 s, what was the approximate distance to the Moon, neglecting any delays in the electronics?
18.) The speed of electromagnetic waves in space is the same as the speed of light in space. a. true b. false
1039.83 is wrongg
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When high-energy charged particles move through a transparent medium with a speed greater than the speed of light in that medium, a shock wave, or bow wave, of light is produced. This phenomenon is called the Cerenkov effect. When a nuclear reactor is shielded by a large pool of water, Cerenkov radiation can be seen as a blue glow in the vicinity of the reactor core due to high-speed electrons moving through the water as shown. In a particular case, the Cerenkov radiation produces a wave front with an apex half-angle of 53.0°. Calculate the speed of the electrons in the water. The speed of light in water is 2.25 × 108 m/s.