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Paper 1 · June 2009 · Units and Measurement

The base units of Planck's constant are

A

kg\,m\,s^{-2}

B

kg\,m^{-1}\,s^{-2}

C

kg\,m^2\,s^{-1}

D

kg\,s\,m^{-1}

Explanation

E = hf, so h = E/f. Energy has units kg m² s⁻², frequency s⁻¹, so h has units kg m² s⁻².

ZIMSEC Physics Paper 1, June 2009, Q2

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