Question

For a gas, the r.m.s. speed at 800 K is

• A. Four times the value at 200 K
• B. Half the value at 200 K
• C. Twice the value at 200 K
• D. Same as at 200 K

Answer 1

The correct option is C

Twice the value at 200 K

$v\propto \sqrt{T}$

$\frac{v_2}{v_1}=\sqrt{\frac{800}{200}}=2$