A wave travels with a speed of 20 m/s and has a wavelength of 0.800 m. what is the period of the wave? a. 250 ms
b. 40 ms
c. 25 ms
d. 4 ms

b. 40 ms

Explanation:

A wave travels at a speed of 20 m/s

the wavelength is 0.800 m

Required

the period

The expression for the velocity of a wave is given as

substituting our data

But T=1/f

T=1/25

T=0.04s

T=40ms

the entire statement is true and correct.  

there's no diagram, nothing is illustrated, and no question is asked.

  the unit of the measure =

explanation:

  the property that is quantified by the energy needed per of material to raise the temperature by one.

  si unit of energy = joule (j)

  si unit of temperature = kelvin (k)

  si unit of mass of material = kilogram (kg)

the property that is quantified by the energy needed per of material to raise the temperature by one is called specific heat.

the unit of specific heat is