Ahe-ne laser emits radiation with second by =633nm. how many photons are emitted per wavelength a laser with a power of 1 mw?

What is the internal energy of 4.00 mol of diatomic nitrogen gas n2 at 455k

Wavelength of 125 meters is moving at a speed of 10 m/s. what is it's frequency?

On a horizontal frictionless surface, a small block with mass 0.200 kg has a collision with a block of mass 0.400 kg. immediately after the collision, the 0.200 kg block is moving at 12.0 m/s in the direction 30° north of east and the 0.400 kg block is moving at 11.2 m/s in the direction 53.1° south of east. use coordinates where the +x-axis is east and the +y-axis is north.(a) what is the total kinetic energy of the two blocks after the collision (in ) what is the x-component of the total momentum of the two blocks after the collision? (indicate the direction with the sign of your ) what is the y-component of the total momentum of the two blocks after the collision? (indicate the direction with the sign of your answer.)