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- DGreek
Explanation:
The word atom is derived from Greek word, 'atomos'. In Greek, the prefix "a" means "not" and the word "tomos" means cut. Our word atom therefore comes from atomos, a Greek word meaning uncuttable.
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The tail of the comet is due to
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(a) Vaporisation of water on the comet |
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(b) Sublimation of vapour in the comet |
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(c) Cooling of water in the comet |
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(d) Vaporisation of heat in the comet |
An e.m.f. of 100 millivolts is induced in a coil when the current in another nearby coil becomes 10 ampere from zero in 0.1 second. The coefficient of mutual induction between the two coils will be
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(a) 1 millihenry |
(b) 10 millihenry |
(c) 100 millihenry |
(d) 1000 millihenry |
A star is going away from the earth. An observer on the earth will see the wavelength of light coming from the star
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(a) Decreased |
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(b) Increased |
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(c) Neither decreased nor increased |
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(d) Decreased or increased depending upon the velocity of the star |
Threshold frequency for a metal is
Hz. Light of
falls on its surface. Which of the following statements is correct
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(a) No photoelectric emission takes place |
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(b) Photo-electrons come out with zero speed |
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(c) Photo-electrons come out with 103 m/sec speed |
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(d) Photo-electrons come out with 105 m/sec speed |