Awave is moving at 40 cm/s. its wave length is 8 cm. what is the frequency of the wave?

Frequency = (speed) / (wavelength)

Frequency = (40 cm/s) / (8 cm)

Frequency = (40/8) ( /s )

Frequency = 5 /s

Frequency = 5 Hz

that tool is called an altimeter which measures your altitude which can be used to tell which atmosphere you are currently in, including the stratosphere.

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