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Chemistry Level 3

The atomic masses of Helium and Neon are 4 and 20 amu respectively. What is the ratio of de Broglie wavelength of He gas at 73C-73^\circ C compared to that of Ne gas at 727C727^\circ C?

The answer is of the form ab\dfrac{a}{b}, where aa and bb are coprime positive integers. Enter your answer as a+ba+b.

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