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Q. What is Maser? Give the principle of it. 1) The term MASER for Microwave Amplification through Stimulated Emission of Radiation. 2) The working of maser is similar to th
What is the difference among Free Electron Theory and Band Theory of solids? Free Electron Theory: This theory says that, metals conduct electricity due to the presence of
What is Power? Power is how fast work is done or energy is used. Example: Remember that cheeseburger (~1/4 pound) I lifted up one meter to do one joule of work? If you now
The earth's rotation about its axis changes measurably over time; You don't have to worry about the details; all you need to know is that our days are growing longer by about 2.3 m
There are five types of modulus of elasticity (i) YOUNG'S MODULUS OF ELASTICITY (Y (ii) BULK MODULUS OF ELASTICITY (K) (iii) COMPRESSIBILITY (iv) MODULUS OF RIGIDITY
Mica is a (A) Dielectric material. (B) Insulating material. (C) Magnetic material. (D) Both insulating and dielectric material. Ans: Mica is a both insulating and
(1) The first practical application for piezoelectric devices was sonar, first developed during worldwar1. Piezoelectric materials are as a source of ultrasonic waves. At sea, they
It is the property of a material by virtue of which it allows itself to be magnetized. Permeability varies from material to material depending upon the saturation and temperature.
What is radioactivity? Radioactivity: The process of spontaneous disintegration of the nuclei of heavy elements with the emission of certain radiations is known as natural ra
A step-up transformer works on 220V and gives 2A to an external resistor. The turn ratio between the secondary and primary coils is 2 : 25. Assuming 100% efficiency, Determine the
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