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Physics help!

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Hey how to we make estimates of something in physics for example :

1 Make reasonable estimates of the following quantities.
(a) the frequency of an audible sound wave
frequency = ........................................... Hz [1]

(b) the wavelength, in nm, of ultraviolet radiation
wavelength = ........................................... nm [1]

(c) the mass of a plastic 30 cm ruler
mass = .............................................. g [1]

(d) the density of air at atmospheric pressure
density = ..................................... kg m–3 [1]
 
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