The Variation in the Pressure of Helium Gas, Measured from Its

question 52

Multiple Choice

The variation in the pressure of helium gas, measured from its equilibrium value, is given by ΔP = 2.9 × 10−⁵ cos (6.20x − 3 000t) where x and t have units m and s, and ΔP is measured in N/m². Determine the frequency (in Hz) of the wave.

• A) 1 500
• B) 477
• C) 1.01
• D) 0.32
• E) 239

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