Question

At what temp the r.m.s. speed of gas goes half value at N.T.P

Answer 1

Answer:

The temperature at which the rms speed of gas molecules becomes double its value at 0

According to the kinetic theory of gases

v

rms

=

3

M

RT

so v

rms

α

T

v

1

v

2

=

T

1

T

2

eq(1)

v

2

=2v

1

T

1

=0

o

C=273K

substitute values back to eq(1)

2=

273

T

2

T

2

=4×273=1092K=819

o

C

T

2

=819

o

C

answer is A