At what temperature is the rms speed of helium molecules half its value at STP (0 C}, 1.0 atm)?

Answer 1

At what temperature is the rms speed of helium molecules twice its value at STP?

Answer 2

Isn't speed squared a measureof energy?
as is PV?

so if speed squared is measure of energy, then 1/2 speed is 1/4 energy, which means PV is 1/4, which means T is 1/4. Check my thinking.

Answer 3

I did'nt follow your approach