Conversations with astronauts on the lunar surface were characterized by a kind of echo in which the earthbound person's voice was so loud in the astronaut's space helmet that it was picked up by the astronaut's microphone and transmitted back to Earth. It is reasonable to assume that the echo time equals the time necessary for the radio wave to travel from the Earth to the Moon and back (that is, neglecting any time delays in the electronic equipment). Calculate the distance from Earth to the Moon given that the echo time was 2.56 s and that radio waves travel at the speed of light ( 3.00 × 10 8 m/s).
Conversations with astronauts on the lunar surface were characterized by a kind of echo in which the earthbound person's voice was so loud in the astronaut's space helmet that it was picked up by the astronaut's microphone and transmitted back to Earth. It is reasonable to assume that the echo time equals the time necessary for the radio wave to travel from the Earth to the Moon and back (that is, neglecting any time delays in the electronic equipment). Calculate the distance from Earth to the Moon given that the echo time was 2.56 s and that radio waves travel at the speed of light ( 3.00 × 10 8 m/s).
Conversations with astronauts on the lunar surface were characterized by a kind of echo in which the earthbound person's voice was so loud in the astronaut's space helmet that it was picked up by the astronaut's microphone and transmitted back to Earth. It is reasonable to assume that the echo time equals the time necessary for the radio wave to travel from the Earth to the Moon and back (that is, neglecting any time delays in the electronic equipment). Calculate the distance from Earth to the Moon given that the echo time was 2.56 s and that radio waves travel at the speed of light (
3.00
×
10
8
m/s).
Definition Definition Rate at which light travels, measured in a vacuum. The speed of light is a universal physical constant used in many areas of physics, most commonly denoted by the letter c . The value of the speed of light c = 299,792,458 m/s, but for most of the calculations, the value of the speed of light is approximated as c = 3 x 10 8 m/s.
In astronomy, a unit of distance is used called the Astronomical Unit. It is the average distance
from the Earth to the Sun. If 1 au is 1.49 × 1011 m, and a light-year is the distance it takes light
to travel in 1 year elapsed time (light travels at a speed of c = 3.0 x 108 ), then how many au
is it to get to Alpha Centauri (our closest star with a planetary system) if is 4.367 lightyears
away?
In 1980, the Voyager spacecraft sent back beautiful photographs of Saturn via radio transmission. If the distance between Earth and Saturn was 1.277 x 1012 m, how much time (in minutes) was required for the transmission?
The average distance between Earth and the Sun is 1.5 ✕ 1011 m.
(a)
Calculate the average speed of Earth in its orbit (assumed to be circular) in meters per second
(b)
What is this speed in miles per hour?
Please answer B
College Physics: A Strategic Approach (3rd Edition)
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.