y • x hertz
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Speed = (wavelength) times (frequency) = (wavelength) divided by (period) = 30/5 = 6 meters per second
assuming walking speed = 100 meter/minute 1200 meters take 1200/100 = 12 minutes
40 meters by 100 meters
A decimeter is 1/10 of a meter, so that means there are 10 per meter. If the car is 5 meters long, it is 50 decimeters long.
If one wave completes, or passes a point, every 8 seconds, then the frequency is 1/8 Hz. = 0.125. The dimensions have nothing to do with the frequency.