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The de Broglie wavelength of a molecule in a gas at room temperature (300 K) is  1 . If the temperature of the gas is increased to 600 K., then the de Broglie wavelength of the same gas molecule becomes

1. 2 1  1
2. 2  1
3. 2 1  1
4. 2  1

Correct answer: 2 1  1

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