Laws of refraction Ratio of velocity of light in rarer medium to velocity of light in denser medium is a constant called refractive index of denser medium w.r.t. rarer medium. The incident rays, refracted rays and normal lie in the […]
Tag: class 12th question and answer
Give a brief account of Huygens’ wave theory of light.
Huygens’ wave theory of light: In 1678, Dutch physicist Christian Huygens proposed a theory to explain the wave nature of light. This theory is called Huygens’ wave theory of light. According to wave theory of light, a source of light […]
State the main characteristics of wave normal & Wave front.
Characteristics of wave normal I. It gives the direction of propagation of wave. II. It is perpendicular to wave front. III. In a homogeneous isotropic medium, wave normal is same as direction of ray of light. IV. It is drawn […]
What is vertical circular motion? Show that motion of an object revolving in vertical circle is non uniform circular motion.
A body revolves in a vertical circle such that its motion at different points is different then the motion of the body is said to be vertical circular motion. Consider an object of […]
State four examples where centripetal force is experienced by the body .
Examples where centripetal force is experienced by the body. I) A stone tied at the end of a string is revolved in a horizontal circle, the tension in the string provides the necessary centripetal force. It is given by equation […]
What is the difference between uniform circular motion and non uniform circular motion? Give examples.
Sr. No U.C.M Non-U.C.M 1. Circular motion with constant angular speed is known as uniform circular motion Circular motion with variable angular speed is called as non-uniform circular motion 2. For U.C.M, α = 0 For non-U.C.M, α≠ 0 3. In U.C.M, work […]
U.C.M is an accelerated motion. Justify this statement.
Definition: In U.C.M, the magnitude of linear velocity (speed) remains constant but the direction of linear velocity goes on changing i.e., linear velocity changes. The […]