I need help on this Phyiscs Problem.

The image shows a pendulum in simple harmonic motion the pendulum starts at a and swing to e

Acertain radio station broadcasts radio waves that have a wavelength of 298cm what is its broadcast frequency?

Me pl give an example of a collision in real life. use the law of conservation of energy to describe the transfer of momentum. be sure and discuss the momentum before and after the collision occurs. you will need at least 3 sentences to thoroughly answer this question.