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

A sample of gas is at 0^@C. To what temperature it must be raised in o

1.	A sample of gas is at 0^@C. To what temperature it must be raised in order to double the r.m.s speed of the molecule
Answer» `270^0C` `819^0C` `1090^0C` `100^0C` ANSWER :B