Acertain very bright star has an effective surface temperature of 20 000 k. assuming that it radiates as a blackbody, what is the wavelength at which () is maximum?

What is work? how much work is done to move an object 0 meters?

Which two particles are found in the center of an atom

Afisherman notices that his boat is moving up and down periodically without any horizontal motion, owing to waves on the surface of the water. it takes a time of 2.20 s for the boat to travel from its highest point to its lowest, a total distance of 0.670 m . the fisherman sees that the wave crests are spaced a horizontal distance of 5.80 m apart. (a) how much is the wavelength? (b) find the period of the wave. (c) how fast are the waves traveling? (d) what is the amplitude a of each wave?