How often a wave occurs (repeats its back and forth or up and down motion) is the wave's . *

-crest
-frequency
-wavelength
-resting point

Frequency

Explanation:

The number of times a wave is occurring is called the frequency of a wave. It is also defined as the number of vibrations or oscillations per unit time. It is represented by f or (nu).

Its relation with the wavelength and the speed of a wave is given by :

Hence, we can say that the correct option is (B) "frequency"

this is an example of "committed" time.

committed time, as contracted time, takes need over essential and available time since it is seen as profitable work. it alludes to the time allotted to keep up a home and family. at the point when a man is commuting using committed time this individual may feel that the drive is an obligation to family, for example, strolling youngsters to class or driving a mate to work. contracted and committed time clients may feel that their commute could really compare to the commute of important or leisure time clients on the grounds that their commute is profitable work. in this manner, they might be more disposed to pick a mechanized method of movement.