CAIE A-Level Physics 22.1.3 Using E = hf

Practise using E = hf and c = fλ to calculate photon energy, frequency or wavelength, with consistent units and rearrangement.

Exam points

calculate photon energy using E = hf
rearrange E = hf to determine frequency or Planck constant and use consistent units

[Maximum number: 3]

For an accelerating voltage of 32 kV in Fig. 8.1, determine:

the minimum wavelength of X-rays produced at the target.

minimum wavelength =m [3]

E=h f and $\lambda=c / f$

C1

$\begin{aligned} \lambda =h c / E =\left(6.63 \times 10^{-34} \times 3.00 \times 10^{8}\right) /\left(0.032 \times 1.60 \times 10^{-13}\right) \end{aligned}$

C1

$\lambda=3.9 \times 10^{-11} \mathrm{~m}$

A1

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22.1.3—E = hf question 1