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An ideal gas is enclosed in a cylinder at pressure of 2 atm and temperature 300 K. The mean time between two successive collisions is 6 × 10 –8 s. If the pressure is doubled and temperature is increased to 500 K, the mean time between two successive collisions will be close to

1. 0.5 × 10 –8 s
2. 4 × 10 –8 s
3. 3 × 10 –6 s
4. 2 × 10 –7 s

Correct answer: 4 × 10 –8 s

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