What is the approximate wavelength of a light whose second-order dark band forms a diffraction angle of 15.0° when it passes thr
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(a) 8927 mi/h
In order to calculate the average speed, we need to convert the time (t=5.0 y) into hours first. In 1 year, we have 365 days, each day consisting of 24 hours, so the time taken is:
The distance covered by the spacecraft is
Therefore, the average speed is just the ratio between the distance covered and the time taken:
(b) 35 minutes (2097 seconds)
The transmitted signals (which is a radio wave, which is an electromagnetic wave) travels back to the Earth at the speed of light:
Since 1 miles = 1609 metres, the distance covered by the signal is
So, the time taken by the signal will be
And since 1 minute = 60 sec, the time taken is