CHECK YOUR UNDERSTANDING 1. Based on the electromagnetic spectrum, which EM wave has the shortest wavelength? the largest frequency? 2. Compare the energies emitted by long-frequency EM waves with those carried by short- frequency EM waves. 3. How does the energy of the EM waves relate to their wavelength? 4. Prolonged exposure to sunlight can cause sunburn. Which EM waves emitted by the sun can easily cause sunburn: infrared waves or ultraviolet waves? Explain your answer. 5. The energy emitted by visible light is considered as bundles of electromagnetic energy called photons. If a 100 W light bulb has an average wavelength of 5.3x10- m, how many photons per second does it emit? 6. Microwaves are also used to cook food. If a microwave oven radiates microwaves with a wavelength of 2.2 cm, how much energy does it emit? 5.2 Low-Frequency EM Waves Low-frequency EM waves include radio waves, microwaves, infrared rays, and visible lig Table 5-1 lists some of the properties of low-frequency electromagnetic waves. TABLE 5-1 Some Properties of Low-Frequency EM waves EM Wave Wavelength (m) Frequency (Hz) radio >1x10-1 <3x10° microwave 1x10-3 to 1x10- 3x10° to 3 x10" 7x10-7 to 1x10-3 4x10-7 to 7x10-7 infrared 3x10 to 4 x 1014 visible light 4x104 to 7.5x 1014 Radio Wavés Radio waves have the lowest frequency (approximately 10' to 1010 Hz) but the woppoh-onrozirsately 10 to 10° m); hence, they can travel long distances through obst This is the reason radio waves are used for communication. Reno3 4G 2021/12/14 11:20 Figure 5-3. Antennas
CHECK YOUR UNDERSTANDING 1. Based on the electromagnetic spectrum, which EM wave has the shortest wavelength? the largest frequency? 2. Compare the energies emitted by long-frequency EM waves with those carried by short- frequency EM waves. 3. How does the energy of the EM waves relate to their wavelength? 4. Prolonged exposure to sunlight can cause sunburn. Which EM waves emitted by the sun can easily cause sunburn: infrared waves or ultraviolet waves? Explain your answer. 5. The energy emitted by visible light is considered as bundles of electromagnetic energy called photons. If a 100 W light bulb has an average wavelength of 5.3x10- m, how many photons per second does it emit? 6. Microwaves are also used to cook food. If a microwave oven radiates microwaves with a wavelength of 2.2 cm, how much energy does it emit? 5.2 Low-Frequency EM Waves Low-frequency EM waves include radio waves, microwaves, infrared rays, and visible lig Table 5-1 lists some of the properties of low-frequency electromagnetic waves. TABLE 5-1 Some Properties of Low-Frequency EM waves EM Wave Wavelength (m) Frequency (Hz) radio >1x10-1 <3x10° microwave 1x10-3 to 1x10- 3x10° to 3 x10" 7x10-7 to 1x10-3 4x10-7 to 7x10-7 infrared 3x10 to 4 x 1014 visible light 4x104 to 7.5x 1014 Radio Wavés Radio waves have the lowest frequency (approximately 10' to 1010 Hz) but the woppoh-onrozirsately 10 to 10° m); hence, they can travel long distances through obst This is the reason radio waves are used for communication. Reno3 4G 2021/12/14 11:20 Figure 5-3. Antennas
Chapter8: Electromagnetism And Em Waves
Section: Chapter Questions
Problem 1MIO
Related questions
Question
Transcribed Image Text:CHECK YOUR UNDERSTANDING
1. Based on the electromagnetic spectrum, which EM wave has the shortest wavelength? the
largest frequency?
2. Compare the energies emitted by long-frequency EM. waves with those carried by short-
frequency EM waves.
3. How does the energy of the EM waves relate to their wavelength?
4. Prolonged exposure to sunlight can cause sunburn. Which EM waves emitted by the sun
can easily cause sunburn: infrared waves or ultraviolet waves? Explain your answer.
5. The energy emitted by visible light is considered as bundles of electromagnetic energy
called photons. If a 100 W light bulb has an average wavelength of 5.3x107 m, how many
photons per second does it emit?
6. Microwaves are also used to cook food. If a microwave oven radiates microwaves with
a wavelength of 2.2 cm, how much energy does it emit?
5.2 Low-Frequency EM Waves
Low-frequency EM waves include radio waves, microwaves, infrared rays, and visible light
Table 5-1 lists some of the properties of low-frequency electromagnetic waves.
TABLE 5-1 Some Properties of Low-Frequency EM waves
Wavelength (m)
>1x10-
Frequency (Hz)
< 3x10°
EM Wave
radio
microwave
1x10-3 to 1x10-1
3x10° to 3 x10"
infrared
7x10-7 to 1×10-3
3x10 to 4 x1014
visible light
4x10-7 to 7x10-7
4x1014 to 7.5x1014
Radio Wavés
Radio waves have the lowest frequency (approximately 10' to 1010 Hz) but the long
wrodpoheonrorirgately 10 to 10° m); hence, they can travel long distances through obstac
This is the reason radio waves are used for communication.
4G
2021/12/1411:20
Figure 5-3, Antennas ai
important components
Expert Solution
This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
This is a popular solution!
Trending now
This is a popular solution!
Step by step
Solved in 2 steps with 2 images
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.Recommended textbooks for you
Physics for Scientists and Engineers: Foundations…
Physics
ISBN:
9781133939146
Author:
Katz, Debora M.
Publisher:
Cengage Learning
College Physics
Physics
ISBN:
9781938168000
Author:
Paul Peter Urone, Roger Hinrichs
Publisher:
OpenStax College
Physics for Scientists and Engineers: Foundations…
Physics
ISBN:
9781133939146
Author:
Katz, Debora M.
Publisher:
Cengage Learning
College Physics
Physics
ISBN:
9781938168000
Author:
Paul Peter Urone, Roger Hinrichs
Publisher:
OpenStax College
Horizons: Exploring the Universe (MindTap Course …
Physics
ISBN:
9781305960961
Author:
Michael A. Seeds, Dana Backman
Publisher:
Cengage Learning
Glencoe Physics: Principles and Problems, Student…
Physics
ISBN:
9780078807213
Author:
Paul W. Zitzewitz
Publisher:
Glencoe/McGraw-Hill