A red laser with a wavelength of 630 nm and a blue laser with a wavelength of 450 nm emit laser beams with the same light power. How do their rates of photon emission compare

Light that is polarized along the vertical direction is incident on a sheet of polarizing material. only 96% of the intensity of the light passes through the sheet and strikes a second sheet of polarizing material. no light passes through the second sheet. what angle does the transmission axis of the second sheet make with the vertical?

How is sound energy produced a. vibrating objects b. objects being heated c. temperature differences d. stationary objects

What are the necessary conditions for fusion?