The Longitudinal Displacement of a Mass Element in a Medium

question 3

Multiple Choice

The longitudinal displacement of a mass element in a medium as a sound wave passes through it is given by s = s_m cos (kx - ωt) .Consider a sound wave of frequency 440 Hz and wavelength 0.75m.If s_m = 12 µm, what is the displacement of an element of air located at x = 1.2 m at time t = 0.11 s?

• A)3.7 µm
• B)4.9 µm
• C)6.0 µm
• D)8.2 µm
• E)12 µm

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Definitions:

IRR

Internal Rate of Return; a financial metric used to evaluate the profitability of potential investments, representing the discount rate that makes the net present value of all cash flows equal to zero.

Cash Flow

A measure of the amount of cash and cash-equivalents being transferred into and out of a business.

Project

An individual or collaborative enterprise planned and designed to achieve a specific goal.

WACC

By employing the Weighted Average Cost of Capital calculation, a company's cost of capital is assessed, with each type of capital weighted proportionately.