An early LiDAR system was used to measure the distance to the moon. This system used a wavelength of 530 nm and a pulse-width of 25 nano-seconds. The transmit power was 10-15 Joules/pulse. (a) Assuming the average distance to the moon is 384,000 km, how long would it take for the laser pulse to make a round trip? Provide answer in seconds to two significant digits. The round-trip time is _____ s.   (b) The LiDAR system was used to measure the distance to the moon.  This measurement had an inherent uncertainty due to the range resolution of the laser.  Based on the parameters given above, what was the range uncertainty (i.e. resolution) for this measurement?

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Wien's displacement law

Students often get confused between Wien's displacement law and Planck's radiation law. Although both are historically related, yet they are conceptually different. Planck's law helps determine the spectrum of a blackbody, while Wien's law determines the relationship between peak wavelength and temperature.