Consider a sphere of radius R exposed to radition of instensity I as shown in figure . If surface of sphere is partially reflection and reflection coefficient is 0.3, then radiation force experienced is :

A ray of light, travelling parallel to diameter of a sphere enters the sphere through a hole at point A as shown in the figure. The inner surface of the sphere is made perfectly reflecting. Find the number of reflections suffered by the ray before coming out of the sphere.

A ray of light, travelling parallel to diameter of a sphere enters the sphere through a hole at point A as shown in the figure. The inner surface of the sphere is made perfectly reflecting. Find the number of reflections suffered by the ray before coming out of the sphere.

A solid sphere of mass M and radius R is pulled by a force F as shown in figure . If the sphere does not slip over the surface , then frictional force acting on the sphere is

A solid sphere of mass M and radius R is pulled by a force F as shown in figure . If the sphere does not slip over the surface , then frictional force acting on the sphere is

The radiation force experienced by body exposed to radiation of intensity I , assuming surface of body to be perfectly absorbing is:

The radiation force experienced by body exposed to radiation of intensity I , assuming surface of body to be perfectly absorbing is:

The radiation force experienced by body exposed to radiation of intensity I , assuming surface of body to be perfectly absorbing is:

A sphere of radius R rolls without slipping between two planks as shown in figure. Find (a) Speed of centre of sphere (b) Angular velocity of the sphere

A sphere of radius R rolls without slipping between two planks as shown in figure. Find (a) Speed of centre of sphere (b) Angular velocity of the sphere