A Question 4What is one difference between an electromagnetic wave and a mechanical wave?A mechanical wave can travel through a vacuum. An electromagnetic wave must have a medium to travel through.BAn electromagnetic wave can travel through a vacuum. A mechanical wave must have a medium to travel through.An electromagnetic wave moves parallel to the direction of the wave's travel. A mechanical wave can move only perpendicular to the direction of the wave's travel.DAn electromagnetic wave moves perpendicular to the direction of the wave's travel. A mechanical wave can move only parallel to the direction of the wave's travel.O Time Remai©2021 Illuminate EducationTM Inc.0%%2334

The electromagnetic wave is a transverse wave and the mechanical wave is a longitudinal wave. An…

Answered: O Question 4 What is one difference…

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

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Chapter16: Electromagnetic Waves

Section: Chapter Questions

Problem 64P: Lasers can be constructed that produce an extremely high intensity electromagnetic wave for a brief...

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Lasers can be constructed that produce an extremely high intensity electromagnetic wave for a brief time—called pulsed lasers. They are used to initiate nuclear fusion, for example. Such a laser may produce an electromagnetic wave with a maximum electric field strength of 1.001011 V/m for a time of 1.00 ns. (a) What is the maximum magnetic field strength in the wave? (b) What is the intensity of the beam? (c) What energy does it deliver on an 1.00-mm2 area?
Police radar guns measure the speed of moving vehicles by transmitting electromagnetic waves at a vehicle and detecting a Doppler shift in the reflected wave. Suppose police radar transmit at a frequency of 24.0 GHz and receives a wave reflected from a car moving toward the radar at 65.0 mph. Find the frequency shift f = f0 fs between the observed (received) and source (transmitted) frequencies.
Radar is used to determine distances to various objects by measuring the round-trip time for an echo from the object. (a) How far away is the planet Venus if the echo time is 1000 s? (b) What is the echo time for a car 75.0 m from a Highway Police radar unit? (c) How accurately (in nanoseconds) must you be able to measure the echo time to an airplane 12.0 km away to determine its distance within 10.0 m?
(a) What is the wavelength of 100MHz radio waves used in an MRI unit? (b) If the frequencies are swept over a (1.00 range centered on 100 MHZ, what is the range of wavelengths broadcast?
Lasers can be constructed that produce an extremely high intensity electromagnetic wave for a brief time-called pulsed lasers. They are used to ignite nuclear fusion, for example. Such a lager may produce an electromagnetic wave with a maximum electric field strength of 1.001011V/m for a time of 1.00 ns. (a) What is the maximum magnetic field strength in the wave? (b) What is the intensity of the beam? (c) What energy does it deliver on a 1.00-mm2 area?
What is the maximum electric field strength in an electromagnetic wave that has a maximum magnetic field strength of 5.00104T (about 10 times the Earth’s)?
A certain 50.0-Hz AC power line radiates an electromagnetic wave having a maximum electric field strength of 13.0 kV/m. (a) What is the wavelength of this very low frequency electromagnetic wave? (b) What is its maximum magnetic field strength?
Integrated Concepts Electromagnetic radiation from a 5.00-mw laser is concentrated on a 1.00m2 area. (a) What is the intensity in W/m2? (b) Suppose a 2.00nC static charge is in the beam. What is me maximum electric force it experience? (c) If the static charge moves at 400 m/s, what maximum magnetic force can it feel?
A radio station broadcasts radio waves at a frequency of 101.7 MHz. The radio waves move through the air at approximately the speed of light in a vacuum. What is the wavelength of the radio waves?
Radio waves transmitted through space at 3.00108m/s by the Voyager spacecraft have a wavelength of 0.120 m. What is their frequency?
Unreasonable Results A researcher measures the wavelength of a 1.20-GHz electromagnetic wave to be 0.500 m. (a) Calculate the speed at which this wave propagates. (b) What is unreasonable about this result? (c) Which assumptions are unreasonable or inconsistent?
E1ecmagnedc radiation from a 5.00-mW laser is concentrated on a 100-mm2 area. (a) What is the intensity in W/m2? (b) Suppose a 2.00-nC electric charge is in the beam. What is the maximum electric force it experiences? (C) If the electric charge moves at 400 m/s, what maximum magnetic force can it feel?

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