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Get Full Access to College Physics - 1 Edition - Chapter 2 - Problem 13pe
Get Full Access to College Physics - 1 Edition - Chapter 2 - Problem 13pe

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# Conversations with astronauts on the lunar surface were

ISBN: 9781938168000 42

## Solution for problem 13PE Chapter 2

College Physics | 1st Edition

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Problem 13PE

Problem 13PE

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 (3.00×108 m/s) .

Step-by-Step Solution:

Solution to 13PE

Step 1

We need to calculate the distance between the earth and the moon when an astronaut hears an echo after 2.56s. An echo is the reflection of sound back to the source. Thus, to hear an echo, the sound has to travel from the source to the surface of reflection and then back to the source.

Therefore let us assume the following after neglecting the time delays, atmospheric perturbations, orbital perturbations etc.

is the time taken for the echo to be heard.

is the time taken for radio waves to travel the one side distance.

is the distance the radio waves travels to generate an echo.

is the distance the radio waves travel from source to earth.

Given data:

is the speed of radio waves.

Step 2 of 2

##### ISBN: 9781938168000

The answer to “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 (3.00×108 m/s) .” is broken down into a number of easy to follow steps, and 108 words. This full solution covers the following key subjects: EARTH, echo, moon, radio, back. This expansive textbook survival guide covers 34 chapters, and 3125 solutions. Since the solution to 13PE from 2 chapter was answered, more than 580 students have viewed the full step-by-step answer. College Physics was written by and is associated to the ISBN: 9781938168000. The full step-by-step solution to problem: 13PE from chapter: 2 was answered by , our top Physics solution expert on 07/07/17, 04:39PM. This textbook survival guide was created for the textbook: College Physics , edition: 1.

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