A certain radio station broadcasts electromagnetic radiation with a wavelength of one quarter mile (0.25 mi). (a) What is the frequency of the broadcast

less than one you can't create energy

float.

archimedes' principle

denser than water sinks in water.

denser than mercury would sink in it

a sonic boom is a loud boom that breaks the sound barrier

explanation:

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me