How many photons are produced in a laser pulse of 0.332 J at 597 nm

Nuclear fusion is the source of energy for stars. besides hydrogen, which other element is most likely also common in stars?

If 10.g of agno3 is available, what volume of 0.25 m agno3 can be prepared

Diffraction is when light is bent around obstructions. which of the these observation about clouds would indicate diffraction? a) after rain storms, you can sometimes see rainbows. b) clouds are white or gray and cannot be seen through. c) on a cloudy day, the temperature tends to be cooler than a sunny day. d) the edges of dark clouds appear lighter. this