Find the speed of a wave (in meters/second) whose wavelength is 4 meters and whose frequency is 3.5 Hz. Enter a number rounded to the first decimal place
(e. g. "0.1").
Your answer

Wave speed = (wavelength) x (frequency)

Wave speed = (4 m) x (3.5 /s)

Wave speed = 14.0 m/s

its c i just checked it

speed of light in vacuum is 300,000 km/s

speed of light in other mediums is given by the expression v = c/n, where c is the speed of light in vacuum and n is the refractive index of medium.

for the first medium v = 200,000 km/s

  so, refractive index of medium = 300000/200000 = 1.5

    1.5 refractive index is usually for glass. so first medium is glass.

for the second medium v = 250,00 km/s

so, refractive index of medium = 300000/250000 = 1.2

    1.2 refractive index is usually for water. so second medium is water.

for the third medium v = 0 km/s

so, refractive index of medium = 300000/0 = ∞

    ∞ refractive index is usually for opaque mediums. so third medium is opaque medium.