Harnessing the sun's energy to produce heat or electricity is

harnessing the sun's energy to produce heat or electricity is : Non-polluting Unlike oil or gas based energy, solar energy create no dangerous emission that is dangerous for our environment. Many scientist believed that solar energy is the answer to the environmental crisis that we currently faced.

If the fundamental frequency of a musical instrument is 22Hz, the frequency of the second harmonic is 44Hz.

The solution on we solve and get this answer is shown below:
Fn=n*F1 where F1 is for the fundamental frequency
F2=2*22
F2=44 Hz

The correct answer is 44 Hz.