Engineering Homework Help

3. Duality nature of material

(a) A light source has an output wavelength of 532 nm and an output power of 10 W. What is the number of photons emitted within 2 s?

(b) The light source in part (a) was used to illuminate a totally black absorption surface. What is the average force applied on the surface within 1 second.

(c) An electron has a wavelength of 0.01 nm. What is the moving speed of the electron? (Mass of electron =9.1 10−31 kg).