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Intensities of an ordinary light and laser light The intensity (I) of a wave is the energy per unit time flowing through a unit normal area. The light from an ordinary light so
Reducing friction by an air stream Cut out a disc of cardboard about 10 cm in diameter. With a red-hot pin, burn a hole by the centre. Saw a small cotton reel in half and glue
The water will not spill Get a small pail and fill it nearly full with water . Swing it around rapidly at arms' length and the water will not spill because of centrifugal force
Write down the condition for the construction of good auditoria. Illustrate the reflection of waves at closed and open ends.
A light horizontal bar has a length of 3m. If a 102-kg mass is placed 80 cm away from the left end of the bar and a 109-kg mass is placed 2.15 m from the left end, where must it be
An infinitely long wire carries a current of three amps. The magnetic field outside the wire: a) Points radially away from the wire b) Points radially inward c) Circ
The formula y=A cos ?(t-x/v), describes a wave that moves in the +x direction along a stretched string. Show that this formula is a solution of the wave equation?
For this circuit which of the subsequent shows a correct way to connect a voltmeter to measure the voltage across R2? Answer: An perfect voltmeter has infinite resis
Q. What is the force essential to accelerate a mass of one kilogram one meter per second per second? Answer:- Fundamentally you have defined the Newton. Force is the ve
Explain about the working of functional units in ultrasonic pulse echo system. The master timer by the electronic clock triggers the signal pulse generator at ordinary interval
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