College Physics
OER 2016 Edition
ISBN: 9781947172173
Author: OpenStax
Publisher: OpenStax College
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Chapter 24, Problem 3TP
To determine
To Explain:
The reason of
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Students have asked these similar questions
12.10. We will learn in Chapter 14 that brightness of light called its intensity I is inversely
proportional to the square of the distance r² from the light source.
a. As r increases what happens to r² (does it increase or decrease)? What then happens to
I (does it increase or decrease)?
b. Write an equation that relates the two variables I, r² using an unknown constant k.
c. The intensity from a light source is 50 Watts/meter2 when observed from 2 meters away.
What is the value and units of the proportionality constant. What is the equation that relates
the two variables I, r² using an unknown constant k.
d. What intensity do you expect to measure at 10 meters away?
CHECКРОINT
Choose the letter that corresponds to the correct answer.
1. Which of the following is not true of all electromagnetic waves?
a. They are transverse waves.
b. They cannot travel through a vacuum
c. They are produced by accelerating charges.
d. They have magnetic as well as electric components
2. Among the EM waves, which has the highest energy?
Gamma rays
C. radio waves
a.
b. Microwaves
d. X-rays
3. In radio broadcasting, AM stands for
After morning
c. amplitude modulation
a.
d. ante meridian
b. Amplitude modeling
4. Which of the following ranges of frequency in radio waves is used by FM radios?
Low frequency
b. Medium frequency
c. ultra-high frequency
d. very high frequency
a.
5. Among the different colors of visible light, which has the longest wavelength?
C. orange
d. red
a.
Blue
b. Green
A set of waves has a speed of 4.2 m/s and a frequency of 2.0 Hz. The wavelength is
O 3.2 m.
O 2.1 m.
O 0.48 m.
O 8.4 m.
O 0.84 m.
Chapter 24 Solutions
College Physics
Ch. 24 - The direction of the electric field shown in each...Ch. 24 - Is the direction of the magnetic field shown in...Ch. 24 - Why is the direction of the current shown in each...Ch. 24 - Prob. 4CQCh. 24 - Prob. 5CQCh. 24 - Should the straight wire antenna of a radio he...Ch. 24 - Under what conditions might wires in a DC circuit...Ch. 24 - Give an example of interference of electromagnetic...Ch. 24 - Prob. 9CQCh. 24 - Can an antenna be any length? Explain your answer.
Ch. 24 - If you live in a region that has a particular TV...Ch. 24 - Explain why people who have the lens of their eye...Ch. 24 - How do ?uorescent soap residues make clothing look...Ch. 24 - Give an example of resonance in the reception of...Ch. 24 - Illustrate that the size of details of an object...Ch. 24 - Why don't buildings block radio waves as...Ch. 24 - Make a list of some everyday objects and decide...Ch. 24 - Your friend says mat more patterns and colors can...Ch. 24 - The rate at which information can be transmitted...Ch. 24 - Give an example of energy carried by an...Ch. 24 - In an MRI scan, a higher magnetic field requires...Ch. 24 - Laser vision correction often uses an excimer...Ch. 24 - Verify that the correct value for the speed of...Ch. 24 - Show that, when SI units for 0 and 0 are entered,...Ch. 24 - What is the maximum electric field strength in an...Ch. 24 - The maximum magnetic field strength of an...Ch. 24 - Verify the units obtained for magnetic field...Ch. 24 - (a) Two microwave frequencies are authorized for...Ch. 24 - (a) Calculate the range of wavelength for AM radio...Ch. 24 - A radio station utilizes frequencies between...Ch. 24 - Find the frequency range of visible light, given...Ch. 24 - Combing your hair leads to excess electrons on the...Ch. 24 - Electromagnetic radiation having a 15.0m...Ch. 24 - Approximately what is the smallest detail...Ch. 24 - A radar used to detect the presence of aircraft...Ch. 24 - Some radar systems detect the size and shape of...Ch. 24 - Determine the amount of time it takes for X-rays...Ch. 24 - If you wish to detect details of the size of atoms...Ch. 24 - If the Sun suddenly turned off, we would not know...Ch. 24 - Distances in space are often quoted in units of...Ch. 24 - A certain 50.0-Hz AC power line radiates an...Ch. 24 - During normal bee?ng, the heat creates a maximum...Ch. 24 - (a) The ideal size (most efficient) for a...Ch. 24 - (a) What is the wavelength of 100MHz radio waves...Ch. 24 - (a) What is the frequency at the 193-nm...Ch. 24 - Prob. 24PECh. 24 - Conversations with astronauts on lunar walks had...Ch. 24 - Lunar astronauts placed a reflector on the Moon's...Ch. 24 - Radar is used to determine distances to various...Ch. 24 - Integrated Concepts (a) Calculate the ratio of the...Ch. 24 - Integrated Concepts (a) Calculate the rate in...Ch. 24 - What is the intensity of an electromagnetic wave...Ch. 24 - Find the intensity of an electromagnetic wave...Ch. 24 - Assume the helium-neon lasers commonly used in...Ch. 24 - An AM radio transmitter broadcasts 50.0 kW of...Ch. 24 - Suppose the maximum safe intensity of microwaves...Ch. 24 - Prob. 35PECh. 24 - Lasers can be constructed that produce an...Ch. 24 - Show that for a continuous sinusoidal...Ch. 24 - Suppose a source of electromagnetic waves radiates...Ch. 24 - Integrated Concepts An LC circuit with a 5.00pF...Ch. 24 - Integrated Concepts What capacitance is needed in...Ch. 24 - Integrated Concepts Police radar determines the...Ch. 24 - Integrated Concepts Assume the mostly infrared...Ch. 24 - Integrated Concepts On its highest power se1ting,...Ch. 24 - Integrated Concepts Electromagnetic radiation from...Ch. 24 - Integrated Concepts A 200-turn flat coil of wire...Ch. 24 - Integrated Concepts If electric and magnetic field...Ch. 24 - Unreasonable Results A researcher measures the...Ch. 24 - Unreasonable Results The peak magnetic field...Ch. 24 - Unreasonable Results An LC circuit containing a...Ch. 24 - Unreasonable Results An LC circuit containing a...Ch. 24 - Create Your Own Problem Consider electromagnetic...Ch. 24 - Create Your Own Problem Consider the most recent...Ch. 24 - Prob. 1TPCh. 24 - Prob. 2TPCh. 24 - Prob. 3TPCh. 24 - Prob. 4TPCh. 24 - Prob. 5TPCh. 24 - Prob. 6TPCh. 24 - Prob. 7TPCh. 24 - Prob. 8TPCh. 24 - Prob. 9TPCh. 24 - Prob. 10TPCh. 24 - Prob. 11TPCh. 24 - Prob. 12TP
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