A Fire Engine Approaches a Wall at 5 M/s While

question 69

Multiple Choice

A fire engine approaches a wall at 5 m/s while the siren emits a tone of 500 Hz frequency. At the time, the speed of sound in air is 340 m/s. How many beats per second do the people on the fire engine hear?

• A) 0
• B) 15
• C) 29
• D) 63
• E) 250

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Definitions:

Accounts Receivable

Amounts owed to a business by its customers for goods or services delivered but not yet paid for.