Answer: A
Explanation: We know that f=p*n
f=50*300=15000 Hz = 15kHz.
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The Electromagnetic ave that is about the size of humans is : A typical micro waves have around 14 inches ( 1.1 meter) in height.
This is very similar to the height of human right before we hit puberty (around 9 - 10 years old)
Answer : I hope this helps !
The Effort Force is the force applied to a machine. Work input is the work done on a machine. The work input of a machine is equal to the effort force times the distance over which the effort force is exerted.
No. Oxygen( an atmosphere to contain the oxygen),water ,sunlight(energy)
