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Q. Give three applications of photoelectric cells.
(i) Photoelectric cells are utilized for reproducing sound in cinematography.
(ii) They are utilized for controlling the temperature of furnaces.
(iii) Photoelectric cells are utilized for automatic switching on and off the street lights.
(iv) Photoelectric cells are utilized in the study of temperature and spectra of stars.
(v) Photoelectric cells are as well used in obtaining electrical energy from sunlight during space travel.
(vi) These cells are utilized in instruments measuring light illumination.
(vii) These cells are utilized in opening and closing of door automatically.
(viii) Photoelectric cells are utilized in burglar alarm and fire alarm.
The molecular theory of magnetism was given by Weber and modified later by Ewing. According to that theory - Each molecule of a substance is a complete magnet in itself. Though,
Q. What is an electric dipole? Define: the dipole moment. Two equal as well as opposite charges separated by a very small distance constitute an electric dipole. Instances amm
what are the type and classification
Biasing Network and Resistor RG Biasing Network (Rs and Cs): JFET is self-biased by using the biasing network R s -C s . Desired bias voltage is obtained when d.c.
What are lens aberrations? Give reasons for them. Illustrate the working of a simple microscope and give a mathematical expression for its magnifying power.
calculate the frequency of radiation which must be incident on a substance placed in magnetic field strength so that the electron can absorb energy
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Q. A rubber ball is dropped to the floor. What force act on the ball to bounce? Does the Earth "bounce" too? Ans. The force of the Earth pushing back on the ball causes
kindly send me a detailed explanation of string constraint relation on pulley based problems....2 solve it do v take a reference point from wich v take d velocities and den v go wi
Two light rays will interfere constructively with maximum amplitude if the path difference between them is: a) one wavelength b) one-half wavelength c) one-qua
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