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Ans: A quantity cannot have units until it has dimensions. A quantity that has dimensions must have units. Yes a quantity have units but still be dimensionless for example,unit of angle is radian ,but it is a dimensionless quantity. A dimensionless quantity may have unit.
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The answer is a," their receptors are sensitive to chemical molecules."
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A time period is denoted by 'T' . It is the time to complete one cycle of vibration. As the frequency of a wave increases, the time period of the wave decreases. The unit for time period is 'seconds
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The astronaut would go the opposite direction due to Newton’s third law of -10N, -10N, -9N, -9N
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