Two astronauts are 1.40 m apart in their spaceship. One speaks to the other. The conversation is transmitted to earth via electromagnetic waves. The time it takes for sound waves to travel at 343 m/s through the air between the astronauts equals the time it takes for the electromagnetic waves to travel to the earth. How far away from the earth is the spaceship?

Two astronauts are 1.40 m apart in their spaceship. One speaks to the other. The conversation is transmitted to earth via electromagnetic waves. The time it takes for sound waves to travel at 343 m/s through the air between the astronauts equals the time it takes for the electromagnetic waves to travel to the earth. How far away from the earth is the spaceship?

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Ch. 33
A galaxy moves away from the Earth. It is observed that light emitted by the galaxy at a wavelength of 705.2 nm is observed by astronomers at Earth at a wavelength of 736.6 nm. Determine the velocity at which the galaxy is moving away from the Earth.
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QUESTION 24 The speed of light on a particular form of plastic fiber is 2.90 x 10^8 m/s. A lightwave with 1,340 nm wavelength is sent down the fiber. What frequency would that be? 2.10 x 10^11 Hz O 2.10 x 10^14 Hz O.2.16 x 10^11 Hz O 2.16 x 10^14 Hz
A plane wave of light that propagates in vacuum in the x-direction obeys the following function: E(x, t) = (2,000 N/C)sin[(1.26 x 107m-1) − (3.14 x 1015 rad/s)t]. What is the speed of the light wave? a. 3.00 x 108 m/s b. 2.49 x 108 m/s c. 2.13 x 108 m/s d. 1.25 x 108 m/s e. 1.84 x 108 m/s
2. Two astronauts are 1.20 m apart in their spaceship. One speaks to the other. The conversation is transmitted to earth via electromagnetic waves. The time it takes for sound waves to travel at 346 m/s through the air between the astronauts equals the time it takes for the electromagnetic waves to travel to the earth. How far away from the earth is the spaceship? m.
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