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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.
Q. What is microwave oven? How it works? Microwave oven It is utilized to cook the food in a short time. When the oven is manage the microwaves are generated which in turn
Kerr effect (J. Kerr; 1875): The ability of certain substances to refract light waves differently whose vibrations are in distinct directions while the substance is placed wit
Ratio of masses of proton and electron is: (1) Infinite (2) 1.8x10 3 (3) 1.8 (4) None of these Ans: (2) 1.8x10 3
It is the degree or extent by which magnetic lines of force can enter a substance and is expressed by µ.
Equilibrium can be spited in given types: (i) Stable equilibrium : After showing a charged particle from it's equilibrium point, if it goes back then it is called in stable equ
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Batch fermentation For aerobic cultivation of yeast the cell mass concentration, X t , and the concentration of the limiting substrate component (glucose), S t , has been deter
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Q. A beam of light converges at a point P. Now a lens is placed in the path of the convergent beam 12 cm from P. At what point does the beam converge if the lens is (a)a convex len
refractive index of the transparent liquids using prism and spectrometer
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