I am struggling to understand the question.

153 Question 5: Suppose that the angular frequency of vibration of a hydrogen molecule is wH,. During careful measurements of gas from a hydrogen supplier, it is observed that weak signals of vibration also occur at angular frequencies corresponding to 86% and 71% of WH2 - Show how these percentages can be explained by the presence of a small amount to deuterium in the hydrogen gas. [5] Hint: Recall that deuterium is an isotope of hydrogen with the same chemical bonding properties, but double the mass. Consider the effective mass when one or both atoms in the hydrogen molecule are replaced with deuterium atoms