Plz

1. which of the following is true about the sun's radiation?

a. it reaches the earth with a wide range of wavelengths.
b. it reaches the earth only as ultraviolet light.
c. it reaches the earth with several wavelengths and one frequency.
d. it reaches the earth with several frequencies and one wavelength.

Air enters a gas turbine with two stages of compression and two stages of expansion at 100 kpa and 17°c. this system uses a regenerator as well as reheating and intercooling – the intercooler returns the air to the inlet temperature. the pressure ratio across each compressor is 4 ; 300 kj/kg of heat are added to the air in each combustion chamber; and the regenerator operates perfectly while increasing the temperature of the cold air by 20°c. determine the system’s thermal efficiency. assume isentropic operations for all compressor and the turbine stages and use constant specific heats at room temperature. (0.378)