Answer: I think, the number of oscillations in a given period of time.
Explanation: Well I guess because in a period time is known as the rate of occurrence of the wave. Hope this helps!
Answer:bill 5 m/s. Jack:10 m/s
Explanation:
Cuz I took it
D. White is a reflectiom of all colors

Since the diameter of helium atom is approximately
, therefore the diameter of helium atom in nano meter,
