Help me plss, or give the correct formula at least, thxx :) A wave is created in an elastic rope. The diagram below represents a snapshot of the wave
at a given instant of time. The distance from point A to points B and C are given. Point A
on the wave moves to the position of point B in 49.90 seconds.
21.1 m
12.8 m C
АЛЛЛЛ
Determine the wavelength (in meters), frequency (in Hertz), and speed (in meters/second) of
this wave.
m
Wavelength:
Frequency:
Hz
Speed: 0.423
m/s
Blank 1:

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.