Velocity is an object's rate of change (usually over time) of its displacement.
<span>Displacement is the difference between the initial position and the FINAL position of an object.
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Answer:
sound and radio waves are completely different phenomena.
Explanation:
<span>When an electron moves from an excited state to the ground state, "Energy releases"
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The period of a pendulum is given by

where L is the pendulum length and g is the gravitational acceleration.
We can write down the ratio between the period of the pendulum on the Moon and on Earth by using this formula, and we find:

where the labels m and e refer to "Moon" and "Earth".
Since the gravitational acceleration on Earth is

while on the Moon is

, the ratio between the period on the Moon and on Earth is