PLEASE PLEASE HELP!!

A wave with a wavelength of 2 meters travels at 6 hz. What is its velocity?

3 m/s

4 m/s

8 m/s

12 m/s

One-hundred (100) wavelengths pass every 5 seconds. What is the frequency of the wave?

1 Hz

20 Hz

500 Hz

It cannot be determined.

Explanation:

(1) We have,

Wavelength of a wave is 2 meters

Frequency of a wave is 6 Hz

It is required to find the velocity of a wave. The velocity of a wave is given by :

So, the velocity of a wave is 12 m/s.

(2)

Number of waves passing are 100

Time taken to pass the wave is 5 seconds

The frequency of wave is given by total number of waves passing per unit time. So,

Frequency of a wave is 20 Hz.

answer: the correct answer id option(d).

explanation:

snell's law refraction:

the angle of refraction =

the angle of incidence =

refractive index of air = = 1

refractive index of glycerol = 1.47

from the given options, the most closest answer to 63.72° is 65° of option (d).