The force acting normally on the unit area of a surface

Two separate monochromatic light beams A and B of the same intensity (energy per unit area per unit time) are falling normally on a unit area of a metallic surface. Their wavelength are lambda_(A) and lambda_(B) respectively. Assuming that all the the incident light is used in ejecting the photoelectrons, the ratio of the number of photoelectrons from beam A to that from B is

The net force acting is not zero on

A "50 W m"^(-2) energy density of sunlight is incident normally on the surface of a solar panel. Some part of incident energy (25%) is reflected from the surface and the rest is absorbed. The force exerted on 1m^(2) surface area will be close to (c=3xx10^(8)ms^(-1))

The viscous force acting on a solid ball of surface area. A moving with terminal velocity v is proportional to

What are the forces acting on the disc?

The internal restoring force acting per unit area of cross-section of the deformed body is called

A square wire frame of size L is dipped in a liquid . On taking out , a membrane is formed . If the surface tension of liquid is T, then force acting per unit length of the frame is

50 W//m^(2) energy density of sunlight is normally incident on the surface of a solar panel. Some part of incident energy (25%) is reflected from the surface and the rest is absorbed. The force exerted on 1m^(2) surface area will be close to (c=3xx10^(8) m//s) :

Calculate the pressure in the following cases : i. On a surface with area 10 "cm"^2 if a force of 1200 N is acting normally on it. ii. On the same area (10 "cm"^2) if the normal force is increased to 2000 N.

Light with an energy flux of 18 W cm^(-2) falls on a non-reflecting surface at normal incidence. If the surface at normal incidence. If the surface has an area of 20 cm^(2) , find the average force exerted on the surface during a span of 30 min.