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Question

An electron has urms value at 270C:

(Given me=9.108×1031kg).

A
3.7×104m/sec
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B
1.3×105km/hr
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C
1.3×105m/sec
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D
11.7×104km/hr
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Solution

The correct options are
A 3.7×104m/sec
B 1.3×105km/hr
The rms speed,
urms=3RTme=3×8.314×3009.108×1028×6.023×1023=3.694×104m/s
It is also equal to 3.694×104m/s×36001000km/hr=1.3295×105km/hr

So, both the options A and B are correct.

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