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• Topic:

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An alpha particle enters a hollow tube of 4 m length with an initial speed of 1 km/s. It is accelerated in the tube and comes out of it with a speed of 9 km/s. The time for which it remains inside the tube is

(1)

(2) $80×{10}^{-3}s$

(3) $800×{10}^{-3}s$

(4) $8×{10}^{-4}s$