The blank of a wave is the number of wavelengths that pass a fixed point in a second

Frequency

Explanation: Frequency is the number of occurrences of a repeating process per unit of time. In case of a wave, frequency is defined as the number of waves that passes through a point per unit time.

It is represented by the symbol . S.I unit for frequency of a wave is Hertz (Hz).

A higher frequency wave has more energy and vice versa.

E= energy

h= planck's constant

= frequency

as we probably am aware that our atmosphere or air have various levels, each level has different gasses, and each gas has another porousness. at the point when the light originates from lower porousness to higher penetrability, it alters its course. with the goal that implies that when the light originates from the moon to the earth, it alters it's course a lot more occasions. it essentially implies that the state of the light piece of the moon is changed on the earth.

not copied too! hope this !

joke:

h o h o hope you have a merry christmas!