Solar panels consisting of combinations of photovoltaic cells use energy in the radiation received from the Sun to generate electricity.
An advertisement for solar panels claims that the intensity of radiation from the Sun incident at the top of the Earth’s atmosphere is more than 2 kW m−2.
Assess the validity of this claim.
radius of Sun = 6.96 × 108 m
surface temperature of Sun = 5790 K
distance from Sun to Earth = 1.50 × 1011 m
The average intensity of radiation from the Sun incident at the Earth’s surface over a 24-hour period has been determined to be 164 W m−2.
Explain why.
(4)
Assess the validity of this claim.
radius of Earth = 6.4 × 106 m
typical efficiency of solar panels = 25%
(4)
Scientists are developing a space station equipped with large solar panels. The space station would be located in a geostationary orbit. The space station would transfer energy to Earth as microwaves.
Explain one advantage of locating the space station in a geostationary orbit.
(2)
mass of Earth = 6.00 × 1024 kg
24 hours = 8.64 × 104 s
(4)
h = ....................................
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