Q1: The solar constant specifies the intensity of solar radiation at a distance
ID: 1331465 • Letter: Q
Question
Q1: The solar constant specifies the intensity of solar radiation at a distance of 1 AU from the Sun (i.e., Earth’s orbit). Its numerical value is 3 W/m2 1.3610 and it also applies to the Moon. Because the Moon is “tidally locked” to Earth, most regions on the Moon are in continuous sunlight for about two weeks at a time, and there are no oceans or atmosphere to distribute heat around the Moon. Make a quick calculation to estimate the maximum surface temperature which can be reached by the Moon.
Q2: Cam-FM broadcasts radio waves at a frequency of 98.1 MHz using a 50 kW transmitter. (a) How many photons are emitted each day? (b) How “hot” is this music anyway? Compute the temperature of an object which would radiate this frequency of radio waves preferentially.
Q3: A green laser is directed to the surface of a certain metal and produces a photoelectric current. Now suppose that the green laser is replaced by a blue laser having the same power. What happens to the photoelectric current? (No calculations are needed but a careful explanation, perhaps referring to simple formulas, is recommended.)
Q4: In a process known as Compton backscattering, a photon strikes an electron and is scattered in the opposite direction. Suppose we start with a gamma ray of wavelength 4.2 pm incident on a stationary electron. (a) What is the wavelength of the scattered photon? (b) How much energy is transferred to the electron?
Explanation / Answer
3)
If the green light is replaced by blue light, the energy of the incident radiation increases and hence the number of photo electrons emitted will have greater energy and hence photo current increases
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