How do you determine if a constant velocity is fast or slow when compared to another velocity? (constant velocity)

In the 1980's, congress authorized the u.s. department of energy to build the wipp facility in the chicuahuan desert in new mexico. what is the purpose of wipp?

What is the energy of a photon of ultraviolet radiation with a frequency of 4.4 × 1015 hz? planck’s constant is 6.63 × 10–34

At what time will the interfering waves have an amplitudeof zero?