Temperature to which a gas must be heated to double the rms speed of its molecules

1. A.
   $499^\circ\text{C}$
2. B.
   $772^\circ\text{C}$
3. C.
   $1464^\circ\text{C}$
4. D.
   $1737^\circ\text{C}$

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1. A.
   $357^\circ\text{C}$
2. B.
   $457^\circ\text{C}$
3. C.
   $547^\circ\text{C}$
4. D.
   $820^\circ\text{C}$

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