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What is the stimulated emission? Define this term briefly. Stimulated emission: a. While photon interacts along with atom that is in the excited state E 2 , in that case de-
why sky is blue?
WORK AND ENERGY 1. Work can be defined as: the force applied in direction of displacement ×. This means that if the force F acts at an angle θ with respect to the direct
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Geometrized units: A system of units in which certain fundamental constants (G, c, k, and h) are set to unity. It makes calculations in certain theories, such like general rel
An elevator is stopped at the ground floor. It starts moving upwards at constant acceleration a>0 for 5 seconds. It then keeps a constant speed for 35 seconds. Finally, it slows do
A device which changes light energy into electrical energy is known as photoelectric cell. It is also known as photocell or electric eye.
Two waves of equal frequency have amplitudes 2 units and 3 units respectively. When they superpose coherently the intensity of the resultant wave is I 1 . The intens
A guitar string produces 4 beats/second when sounded with a250Hz tuning fork and 9 beats/second when sounded with a 255 Hz tuning fork. What is the vibration frequency?
Derive the mathematical relation connecting n,u,v and R for refraction at a spherical surface concave towards a point object in a denser medium.
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