Help with my physics homework please

AI Thread Summary
To determine how long it takes for a radio wave to travel from Mars to Earth, the frequency of the wave is irrelevant; instead, the speed of light in a vacuum is needed. The distance between Mars and Earth is approximately 8.00 x 10^7 km. The speed of light is approximately 3.00 x 10^5 km/s. By dividing the distance by the speed of light, the time taken can be calculated accurately. The initial calculations presented do not correctly address the problem, as they mistakenly incorporate frequency instead of using the speed of light.
madman555
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Homework Statement


How long would it take a radio wave whose frequency is 7.25 x 10^5 Hz to travel from Mars to Earth if the distance between the two planets is approximately 8.00 x 10^7 km.

Homework Equations



Don't know what to put here.

The Attempt at a Solution


7.25 x 10^5 / 8.00 10^9=9.0625 x 10^-5
Is that they right answer or am i doing this whole thing the wrong way?
 
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madman555 said:

Homework Statement


How long would it take a radio wave whose frequency is 7.25 x 10^5 Hz to travel from Mars to Earth if the distance between the two planets is approximately 8.00 x 10^7 km.


Homework Equations



Don't know what to put here.

The Attempt at a Solution


7.25 x 10^5 / 8.00 10^9=9.0625 x 10^-5
Is that they right answer or am i doing this whole thing the wrong way?

Hint: The frequency of the radio wave is irrelevant in this question. What is the velocity of propagation of light (and hence radio waves) in a vacuum?
 

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