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
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
- A
$8 \times {10^{ - 3}}$s
- B
$80 \times {10^{ - 3}}s$
- C
$800 \times {10^{ - 3}}s$
- D
$8 \times {10^{ - 4}}s$
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