Photoelectric effect occurs when frequency Ν of incident photon is a. Ν < Ν 0
b. Ν = Ν 0
c. Ν = > Ν 0
d. Ν = 0

If steel is more dense that lake water, why can a boat float

The magnitude of the poynting vector of a planar electromagnetic wave has an average value of 0.939 w/m^2 . the wave is incident upon a rectangular area, 1.5 m by 2.0 m, at right angles. how much total electromagnetic energy falls on the area during 1.0 minute?

What pressure difference is required between the ends of a 2.0-m-long, 1.0-mm-diameter horizontal tube for 40 c water to flow through it at an average speed of 4.0 m/s?