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Q.

The half life of a neutron is 800 sec. 108 neutrons at a certain instant are projected from one space station towards another space station, situated 3200 km away, with a velocity 2000 m/s. Their velocity remains constant during the journey. How many neutrons reach the other station?

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a

50×106

b

25×106

c

80×105

d

25×105

answer is B.

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Detailed Solution

t=3200×1032000=1600sec.=2T1/2⇒N=N04=1084=25×106
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The half life of a neutron is 800 sec. 108 neutrons at a certain instant are projected from one space station towards another space station, situated 3200 km away, with a velocity 2000 m/s. Their velocity remains constant during the journey. How many neutrons reach the other station?