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Drift Velocity of Electron

Arrange the f...

Question

Arrange the following speeds in increasing order:
$10 m s^{- 1}, 1 k m m i n^{- 1}, 18 k m h^{- 1}$ .

1 k m m i n^{- 1}, 10 m s^{- 1}, 18 k m h^{- 1}

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18 k m h^{- 1}, 1 k m m i n^{- 1}, 10 m s^{- 1}

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18 k m h^{- 1}, 10 m s^{- 1}, 1 k m m i n^{- 1}

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10 m s^{- 1}, 18 k m h^{- 1}, 1 k m m i n^{- 1}

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Solution

The correct option is
B
$18 k m h^{- 1}, 10 m s^{- 1}, 1 k m m i n^{- 1}$

We have to convert each of these values of speed into $m / s$ .
$10 m / s = 10 m / s$
$1 k m / m i n = 1000 m / 60 s = 16.67 m / s$
$18 k m / h = 18 \times 1000 m / (60 \times 60 s) = 5 m / s$
Hence the correct option will be B.

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