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The waves which needs medium for their propagation are known as mechanical waves. Example : Waves on string and spring, waves on water surface, sound waves, seismic waves.
Quantum Theory of Light: Wave theory failed to describe some new effects in 19th century. A German Physicist Max Plank gave theory about the nature of light. 1. Light is emi
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A device which changes light energy into electrical energy is known as photoelectric cell. It is also known as photocell or electric eye.
A uniform spring of length 2m and mass 200gm is under a tension of 800N. Find the speed of transverse wave in the string.
Explain vectors Vectors : a quantity that has a size as well as direction is known a vector. So, for example, the wind blows with some speed and in some direction. So the win
Demonstrating how the angle of the sun's rays changes from day to day at the same hour Cut a 1-cm round hole in a piece of paper or cardboard. Place this in a south window of y
A child rolls a ball up a hill at 3.24 m/s. If the ball experiences an acceleration of 2.32 m/s 2 . How long will it take for the ball to have a velocity of 1.23 m/s down the
Rotating a Mirror and the Reflected Ray Describing in which when a mirror is rotated through an angle, the reflected ray is rotated through twice that angle. You might drag th
A string has a linear density of 7.20 10-3 kg/m and is under a tension of 390 N. The string is 1.9 m long, is fixed at both ends, and is vibrating in the standing wave pattern sho
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