None of the above are the name of an air mass. This is probably a trick question.
Answer: A
Wavelength and frequency of light are closely related. The higher the frequency, the shorter the wavelength. Because all light waves move through a vacuum at the same speed, the number of wave crests passing by a given point in one second depends on the wavelength.
It depends how the sound travels and the conditions, The speed of sound in dry air, 20°C is 323 m/s
The law of conservation of energy states that energy cannot be created or destroyed, it can only transferred from one type to another.