Interference was observed in interference chamber when air was present, now the chamber is evacuated and if the same light is used, a careful observer will see
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(a) No interference |
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(b) Interference with bright bands |
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(c) Interference with dark bands |
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(d) Interference in which width of the fringe will be slightly increased |
(d) Interference in which width of the fringe will be slightly increased
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The mutual characteristic of triode is
(a)
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(a)
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(c)
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(d)
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You are given four sources of light each one providing a light of a single colour – red, blue, green and yellow. Suppose the angle of refraction for a beam of yellow light corresponding to a particular angle of incidence at the interface of two media is 90º. Which of the following statements is correct if the source of yellow light is replaced with that of other lights without changing the angle of incidence?
For television broadcasting, the frequency employed is normally
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(a) 30-300 MHz |
(b) 30-300 GHz |
(c) 30-300 KHz |
(d) 30-300 Hz |
Mean life of a radioactive sample is 100 seconds. Then its half life (in minutes) is
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(a) 0.693 |
(b) 1 |
(c) 10-4 |
(d) 1.155 |