Physics
Hertz is a unit for measuring

Intensity of waves
Clarity of waves
Wavelength
Frequency of waves

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Physics
The term ''equinox' means

The path which the Earthtakes around the Sun
The time when the Sun seems to be going round and round in the sky in the Arctic but does not go below the horizon
The axis of the Earth around which it rotates
When the day and night are of equal duration

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