Question

A sample of gas is at 0ºC. To what temperature it must be raised in order to double the r.m.s. speed of the molecule-

• A. 270ºC
• B. 819ºC
• C. 1090ºC
• D. 100ºC

Answer 1

Answer: (B)

819ºC

Answer 2

Qv_rms­ µ $\sqrt{T}$

\To double the rms speed. Temperature should be made four times.

T₂ = 4T₁ = 4(273 + 0)

= 1092 K = 819º C