1.

. An alpha particle enters a hollow tube of 4m lengthwith an initial speed of 1 km/s. It is accelerated inthe tube and comes out of it with a speed of 9 km/s.The time for which it remains inside the tube is(a) 8 x 10-3 s(c) 800 x 10-3(b) 80 x 10-3 s(d) 8 x 10-4 s

Answer»

v2=u2+2as⇒(9000)2−(1000)2=2×a×4⇒a=107m/s2Now t=v−ua⇒t= 9000−1000107=8×10−4sec



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