How can velocity be used to calculate distance? (logically)

The sun generates both mechanical and electromagnetic waves. which statement about those wave is true?

Pls pls pls pls ! describe, in your own words, how you found the epicenter of the earthquake.

Red light strikes a metal surface and electrons are ejected. if violet light is now used with a 10% greater intensity, what will happen to the ejection rate (number of ejected electrons per second) and the maximum energy of the electrons? a) greater ejection rate; same maximum energyb) same ejection rate; greater maximum energyc) greater ejection rate; greater maximum energyd) same ejection rate; same maximum energye) none of the above answers are correct