Understanding Our Universe
3rd Edition
ISBN: 9780393614428
Author: PALEN, Stacy, Kay, Laura, Blumenthal, George (george Ray)
Publisher: W.w. Norton & Company,
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Chapter 4, Problem 15QAP
To determine
The effect of change in wavelength on frequency.
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(a) The distance to a star is approximately 5.50 × 10¹8 m. If this star were to burn out today, in how many years would we see it disappear?
581.35
years
(b) How long does it take sunlight to reach Earth?
8.33
minutes
(c) How long does it take for a microwave radar signal to travel from Earth to the Moon and back? (The distance from Earth to the Moon is 3.84 x 105 km.)
X
1.28
Your response differs from the correct answer by more than 10%. Double check your calculations. S
(a) The distance to a star is approximately 6.74 ✕ 1018 m. If this star were to burn out today, in how many years would we see it disappear? ___ years(b) How long does it take sunlight to reach Earth? ____ minutes(c) How long does it take for a microwave radar signal to travel from Earth to the Moon and back? (The distance from Earth to the Moon is 3.84 ✕ 105 km.)______ s
A) Suppose a star is 4.15 ✕ 1018 m from Earth. Imagine a pulse of radio waves is emitted toward Earth from the surface of this star. How long (in years) would it take to reach Earth?
B) The Sun is 1.50 ✕ 1011 m from Earth. How long (in minutes) does it take sunlight to reach Earth?
C) The Moon is 3.84 ✕ 108 m from Earth. How long (in s) does it take for a radio transmission to travel from Earth to the Moon and back?
Chapter 4 Solutions
Understanding Our Universe
Ch. 4.1 - Prob. 4.1CYUCh. 4.2 - Prob. 4.2CYUCh. 4.3 - Prob. 4.3CYUCh. 4 - Prob. 1QAPCh. 4 - Prob. 2QAPCh. 4 - Prob. 3QAPCh. 4 - Prob. 4QAPCh. 4 - Prob. 5QAPCh. 4 - Prob. 6QAPCh. 4 - Prob. 7QAP
Ch. 4 - Prob. 8QAPCh. 4 - Prob. 9QAPCh. 4 - Prob. 10QAPCh. 4 - Prob. 11QAPCh. 4 - Prob. 12QAPCh. 4 - Prob. 13QAPCh. 4 - Prob. 14QAPCh. 4 - Prob. 15QAPCh. 4 - Prob. 16QAPCh. 4 - Prob. 17QAPCh. 4 - Prob. 18QAPCh. 4 - Prob. 19QAPCh. 4 - Prob. 20QAPCh. 4 - Prob. 21QAPCh. 4 - Prob. 22QAPCh. 4 - Prob. 23QAPCh. 4 - Prob. 24QAPCh. 4 - Prob. 25QAPCh. 4 - Prob. 26QAPCh. 4 - Prob. 27QAPCh. 4 - Prob. 28QAPCh. 4 - Prob. 29QAPCh. 4 - Prob. 30QAPCh. 4 - Prob. 31QAPCh. 4 - Prob. 32QAPCh. 4 - Prob. 33QAPCh. 4 - Prob. 34QAPCh. 4 - Prob. 35QAPCh. 4 - Prob. 36QAPCh. 4 - Prob. 37QAPCh. 4 - Prob. 38QAPCh. 4 - Prob. 39QAPCh. 4 - Prob. 40QAPCh. 4 - Prob. 41QAPCh. 4 - Prob. 42QAPCh. 4 - Prob. 43QAPCh. 4 - Prob. 44QAPCh. 4 - Prob. 45QAP
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- 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?arrow_forwardWhat is the frequency of a light ray of wavelength 6.50 x 10^8m?arrow_forwardA radio transmitter broadcast at a frequency of 119 kHz. what is the wavelength of the wave? (Speed of light in vacuum is 3•10^8)arrow_forward
- (a) Suppose a star is 8.59 x 1018 m from Earth. Imagine a pulse of radio waves is emitted toward Earth from the surface of this star. How long (in years) would it take to reach Earth? years (b) The Sun is 1.50 x 1011 m from Earth. How long (in minutes) does it take sunlight to reach Earth? minutes (c) The Moon is 3.84 x 108 m from Earth. How long (in s) does it take for a high-intensity laser beam to travel from Earth to the Moon and back?arrow_forwardDetermine the frequency of red visible light (λ = 650 nm) (GIVEN: 1 m = 10⁹ nm) Answer: Tip: To enter scientific notation, use "e". Examples: 21000 is 2.1×104. It would be entered as 2.1e4 0.000093 is 9.3x105. It would be entered as 9.3e-5 Hzarrow_forwardThe wavelength of visible light is from, O 400 m to 700 m O 400 km to 700 km O 400 cm to 700 cm O 400 nm to 700 nmarrow_forward
- How long will it take, for the sunlight to reach the earth surface, if the sun is 1.497 x 10"m away from the earth? (Consider the speed of light in vacuum)arrow_forward1) What is the wavelength for an FM radio signal that has a frequency of 107.8 MHz? (speed of light, is 3.00*10^ 1 m/s )arrow_forwardWhich of the following statements about EM waves below is FALSE? Şelect one: O 1. An EM wave can travel through vacuum. O 2. The EM wave always propagates in a direction perpendicular to the magnetic field direction. O 3. The directions of the magnetic field and the electric field in an EM wave are not always perpendicular to each other. O 4. DC voltage source cannot produce electromagnetic waves.arrow_forward
- What is the wavelength of an FM radio station that broadcasts at 101.1 MHz?Assume speed of light c = 3.0 * 10⁸ m/s. Round your answer to two decimal places.arrow_forwardIf the frequency of an EM wave is doubled and the speed remains constant, its wavelength is ____. quartered. halved. unchanged. doubled. quadrupled. As a light wave travels into a medium in which its speed decreases, its wavelength would ____. increase decrease remain the same If the frequency of an EM wave is doubled and the speed remains constant, its wavelength is ____. quartered. halved. unchanged. doubled. quadrupled. Correct answers are noted but I'm confused why?arrow_forwardHow can one encode a signal inside a radio wave? O The atoms that make up the medium can be modified to carry the code O The frequency can be modulated to match the code O The speed can be made to vary as it travels through the airarrow_forward
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