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A Li7 target is bombarded with a proton beam current of 10-4A for 1 hour to produce Be7 with an activity of 1.8 *108 disintegrations per second . assuming that one Be radioactive nucleus is produced by 1000 protons bobarding ...
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A Li7 target is bombarded with a proton beam current of 10-4A for 1 hour to produce Be7 with an activity of 1.8 *108 disintegrations per second . assuming that one Be radioactive nucleus is produced by 1000 protons bobarding ...
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Calculate the coefficient of refraction of a sound wave on the boundary between air and glass. Young’s modulus for a glass is 6.9 * 1010 Nm-2 , density of glass is 2.6gcm-3 and air temperature is 20°C . velocity of sound i ...
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in a set of 5 games in a tennis match between A and B , the probability of a player who has won the earlier game winning a game is 2/3. A wins the first game.The probability that A will win atleast three of the next four game ...
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the slope of a chord of a parabola y2=8x which is normal at one end and subtends a right angle at the vertex is ?? ...
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*Image* *Image* whats the concept behind ...... this concept is asked frequently in the JEE ...
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of ICl2- and the number of lone pairs steps !! ...
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the least positive value of "n" for which (1+w2)n = (1+w4)n, where w is a non real cube root of unity is .......... ? ...
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a rod of weight, w is supportd by two parallel knife edges A and B and is in equilibrium in a horizontal position. the knives are at a distance of d from each other. the centre of mass of the rod is at a distance x from A. th ...
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*Image* how is it done ? ...
