Light having a wavelength of 450 nm (4.50 x 10-7 m) moves through space at
3.0 x 108 m/s. What is the frequency of the light?

the closer the planet is to the sun, the larger the gravity

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