R.M.S velecity of helium at S.T.P is x cm/sec. R.M.S velocity of helium at 273 k and 4 atm is 

Options

A. 4x cm/sec
B. 3x cm/sec
C. 2x cm/sec
D. x cm/sec

Explanation

To find the R.M.S (Root Mean Square) velocity of helium at 273 K and 4 atm, given that the R.M.S velocity at standard temperature and pressure (S.T.P) is x cm/sec, we can follow these steps:

### Step 1: Understand the R.M.S Velocity Formula
The R.M.S velocity (v_rms) of a gas is given by the formula:
\[ v_{rms} = \sqrt{\frac{3RT}{M}} \]
where:
- \( R \) is the universal gas constant,
- \( T \) is the absolute temperature in Kelvin,
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