Photons of energy 7.0 ev strike a metal whose work function is 2.3 ev. ke of the most energetic photoelectron is
5.2 ev
3.8 ev
4.7 ev
7.4 ev
9.3 ev

14. a body is projected with velocity vi from a.at the same time another body is projectedvertically upwards from point b withvelocity v2 lies vertically below the highestpoint. both the bodies collide thenv2÷v1is

The space between two 15-in.-long concentric cylinders is filled with glycerin (viscosity = 8.5 × 10-3 lb·s/ft2). the inner cylinder has a radius of 1 in. and the gap width between cylinders is 0.1 in. determine (a) the torque and (b) the power required to rotate the inner cylinder at 180 rev/min. the outer cylinder is fixed. assume the velocity distribution in the gap to be linear.

Amagnetic field applies forces on: a)static chargesb)moving chargesc)water flow