21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Chapter 5, Problem 16QP
To determine
Whether light can travel at a lower speed than
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A distant galaxy emits light that has a wavelength of 655.6 nm. On earth, the wavelength of this light is measured to be 661.9 nm. (a)
Decide whether this galaxy is approaching or receding from the earth. (b) Find the speed of the galaxy relative to the earth. (Give your
answer to 4 significant digits. Use 2.998 × 108 m/s as the speed of light.)
Your answer is partially correct.
A distant galaxy emits light that has a wavelength of 634.5 nm. On earth, the wavelength of this light is measured to be 639.0 nm. (a)
Decide whether this galaxy is approaching or receding from the earth. (b) Find the speed of the galaxy relative to the earth. (Give your
answer to 4 significant digits. Use 2.998 x 108 m/s as the speed of light.)
(a) The galaxy is
(b) Number
receding
2126000
from the earth.
Units
m/s
A distant galaxy emits light that has a wavelength of 655.7 nm. On earth, the wavelength of this light is measured to be 660.7 nm. (a)Decide whether this galaxy is approaching or receding from the earth. (b) Find the speed of the galaxy relative to the earth. (Give youranswer to 4 significant digits. Use 2.998 × 108 m/s as the speed of light.)
Chapter 5 Solutions
21st Century Astronomy
Ch. 5.1 - Prob. 5.1ACYUCh. 5.1 - Prob. 5.1BCYUCh. 5.2 - Prob. 5.2CYUCh. 5.3 - Prob. 5.3CYUCh. 5.4 - Prob. 5.4CYUCh. 5.5 - Prob. 5.5CYUCh. 5 - Prob. 1QPCh. 5 - Prob. 2QPCh. 5 - Prob. 3QPCh. 5 - Prob. 4QP
Ch. 5 - Prob. 5QPCh. 5 - Prob. 6QPCh. 5 - Prob. 7QPCh. 5 - Prob. 8QPCh. 5 - Prob. 9QPCh. 5 - Prob. 10QPCh. 5 - Prob. 11QPCh. 5 - Prob. 12QPCh. 5 - Prob. 13QPCh. 5 - Prob. 14QPCh. 5 - Prob. 15QPCh. 5 - Prob. 16QPCh. 5 - Prob. 17QPCh. 5 - Prob. 18QPCh. 5 - Prob. 19QPCh. 5 - Prob. 20QPCh. 5 - Prob. 21QPCh. 5 - Prob. 22QPCh. 5 - Prob. 23QPCh. 5 - Prob. 24QPCh. 5 - Prob. 25QPCh. 5 - Prob. 26QPCh. 5 - Prob. 27QPCh. 5 - Prob. 28QPCh. 5 - Prob. 29QPCh. 5 - Prob. 30QPCh. 5 - Prob. 31QPCh. 5 - Prob. 32QPCh. 5 - Prob. 33QPCh. 5 - Prob. 34QPCh. 5 - Prob. 35QPCh. 5 - Prob. 36QPCh. 5 - Prob. 37QPCh. 5 - Prob. 38QPCh. 5 - Prob. 39QPCh. 5 - Prob. 40QPCh. 5 - Prob. 41QPCh. 5 - Prob. 42QPCh. 5 - Prob. 43QPCh. 5 - Prob. 44QPCh. 5 - Prob. 45QP
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- (i) Does the speed of an electron have an upper limit? (a) yes, the speed of light c (b) yes, with another value (c) no (ii) Does the magnitude of an electrons momentum have an upper limit? (a) yes, mec (b) yes, with another value (c) no (iii) Does the electrons kinetic energy have an upper limit? (a) yes, mec2 (b) yes, 12mec2 (c) yes, with another value (d) noarrow_forwardThe speed of the Earth in its orbit is 29.8 km/s. If that is the magnitude of the velocity v of the ether wind in Figure P39.3, find the angle between the velocity of light c in vacuum and the resultant velocity of light if there were an ether.arrow_forwardAs a car heads down a highway traveling at a speed v away from a ground observer, which of the following statements are true about the measured speed of the light beam from the cars headlights? More than one statement may be correct, (a) The ground observer measures the light speed to be c + . (b) The driver measures the light speed to be c. (c) The ground observer measures the light speed to be c. (d) The driver measures the light speed to be c - . (e) The ground observer measures the light speed to be c - .arrow_forward
- An observer in a coasting spacecraft moves toward a mirror at speed v relative to the reference frame labeled by S in Figure P26.46. The mirror is stationary with respect to S. A light pulse emitted by the spacecraft travels toward the mirror and is reflected back to the spacecraft. The spacecraft is a distance d from the mirror (as measured by observers in S) at the moment the light pulse leaves the spacecraft. What is the total travel time of the pulse as measured by observers in (a) the S frame and (b) the spacecraft? Figure P26.46arrow_forwardWhat is wrong with the following expressions? How can you correct them? (a) C=AB , (b) C=AB , (c) C=AB , (d) C=AB , (e) C+2A=B , (f) C=AB , (g) AB=AB , (h) C=2AB , (i) C=A/B , and (j) C=A/B .arrow_forwardSuppose an astronaut is moving relative to the Earth at a significant fraction of the speed of light. (a) Does he observe the rate of his clocks to have slowed? (b) What change in the rate of Earth-bound clocks does he see? (c) Does his ship seem to him to shorten? (d) What about the distance between stars that lie on lines parallel to his motion? (e) Do he and an Earth-bound observer agree on his velocity relative to the Earth?arrow_forward
- The truck in Figure P39.1 is moving at a speed of 10.0 m/s relative to the ground. The person on the truck throws a baseball in the backward direction at a speed of 20.0 m/s relative to the truck. What is the velocity of the baseball as measured by the observer on the ground? Figure P39.1arrow_forwardAn observer in a coasting spacecraft moves toward a mirror at speed v relative to the reference frame labeled by S in Figure P26.46. The mirror is stationary with respect to S. A light pulse emitted by the spacecraft travels toward the mirror and is reflected back to the spacecraft. The spacecraft is a distance d from the mirror (as measured by observers in S) at the moment the light pulse leaves the spacecraft. What is the total travel time of the pulse as measured by observers in (a) the S frame and (b) the spacecraft? Figure P26.46arrow_forward(a) The distance to a star is approximately 4.97 × 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 x 105 km.) Sarrow_forward
- A distant galaxy emits light that has a wavelength of 617.7 nm. On earth, the wavelength of this light is measured to be 623.6 nm. (a) Decide whether this galaxy is approaching or receding from the earth. (b) Find the speed of the galaxy relative to the earth. (Give your answer to 4 significant digits. Use 2.998 × 108 m/s as the speed of light.) (a) The galaxy is (b) Number ◆ from the earth Units ✪arrow_forwardA distant galaxy emits light that has a wavelength of 638.3 nm. On earth, the wavelength of this light is measured to be 639.7 nm. (a) Decide whether this galaxy is approaching or receding from the earth. (b) Find the speed of the galaxy relative to the earth. (Give your answer to 4 significant digits. Use 2.998 × 108 m/s as the speed of light.) (a) The galaxy is (b) Number i from the earth. Units SUPPORTarrow_forwardThe speed of light in space is 3.00 x 108 m/s. The time for light from the Sun to reach Earth is 8 minutes 20 seconds. Therefore, the distance from the Sun to Earth is 2.40 x 109 m. 8.64 x 1012 m. 1.50 x 1011 m. 2.25 x 109 m.arrow_forward
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