What is the period of a wave if the wavelength is 10 m and the speed is 200 m/s

 = 0.05 seconds

The speed of a wave is given by the product of frequency and wavelength;

Speed = Frequency × wavelength

Thus;

Frequency = speed/wavelength

                  = 200/10

                   =  20 Hz

But; period = 1/ frequency

Hence; Period = 1/20

                         = 0.05 seconds

answer: the rock sample is a sedimentary rock.

explanation:

it is given that:

mass of rock sample, m = 2.7 g

volume of rock sample,

so, density of rock sample will be

since, the density of rock sample is . hence, the rock sample is a sedimentary rock, whose densities varies between .

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.