What is the period of a wave traveling 5 m/s if its wavelength is 20 m/s

Speed of wave is given as

Wavelength of the wave is given as

now from the formula of wave time period we can say

so it will have time period of T = 4 s

layers of the earth affect the waves and these effects are seen on instruiments such as seimometers

what experimental evidence led scientists to change from the previous model to this one?

a few of the positive particles aimed at a gold foil seemed to bounce back.

the colors of light emitted from heated atoms had very specific energies.

experiments with water vapor showed that elements combine in specific proportions.

cathode rays were bent in the same way whenever a magnet was brought near them.