What forces do you know about and
what do they do?

There are 4 fundamental forces

1.Gravitational force :the force of mutual attraction between any two objects by virtue of their masses .

2.electromagnetic force :the force between charged particles.

3. strong nuclear force :force which binds protons and neutrons in the nucleus.

4..weak nuclear force: This forces only appear in certain nuclear processes such as the beta decay of nucleus ..

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Explanation:

As w = 2000π

2πf= 2000π

f= 1000Hz

speed = wavelength × f= w/k

wavelength = 2000π/ (0.5× 1000)

= 4π

or

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