A Source Emits Sound with a Frequency of 1000 Hz

question 38

Multiple Choice

A source emits sound with a frequency of 1000 Hz.It is moving at 20 m/s toward a stationary reflecting wall.If the speed of sound is 340 m/s an observer at rest directly behind the source hears a beat frequency of:

• A)3.0 Hz
• B)55 Hz
• C)63 Hz
• D)114 Hz
• E)118 Hz

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Definitions:

Regression Coefficient

A value that represents the amount by which a dependent variable changes when a related independent variable changes by one unit.

Regression

A statistical method used to determine the relationship between a dependent variable and one or more independent variables.

Variance

Average squared deviation from the mean.

Degrees Freedom

Degrees of freedom refer to the number of independent values or quantities which can be assigned to a statistical distribution or to the number of variables minus the number of constraints in a system.