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Select all true statements. The threshold of human hearing is defined as having an intensity of exactly one W/m2. Sound...

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Physics

Select alltrue statements.

The threshold of humanhearing is defined as having an intensity of exactly oneW/m2.

Sound is alongitudinal wave in air.

Sound waves travelfaster through gases than through solids.

The sound of a hornapproaching a stationary observer will have higher frequency thanthe frequency of the horn at rest.   

All other variablesbeing equal, the speed of sound in air decreases as the airtemperature becomes colder.

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