Are formulas given in the exam?

No. You must recall SPM Physics formulas.

Is a formula sheet given for these calculations?

No. SPM Physics (4531) provides no formula sheet, recall each formula and write units on every line.

What does the easy band mean?

Foundation items use the formula directly; marks come from showing the method.

Can a tutor mark my working?

Yes, in a one-to-one lesson the teacher checks each line and fixes the exact step that loses marks. From RM50/hr, paid trial available.

Quantum Physics Calculations (Easy), SPM Physics

How to approach

These are direct plug-in problems: identify the formula and substitute. Get these automatic first.

The method

List what is given, with units.
Choose the formula and rearrange for the unknown.
Substitute with units on every line.
Round to the correct significant figures.

Worked examples

Photon energy

E = hf

Light of frequency f = 5.0 × 10¹⁴ Hz (h = 6.63 × 10⁻³⁴ J s). E = hf = 6.63 × 10⁻³⁴ × 5.0 × 10¹⁴ = 3.32 × 10⁻¹⁹ J.

Photon energy (wavelength form)

E = hc / λ

Light of wavelength λ = 6.0 × 10⁻⁷ m (h = 6.63 × 10⁻³⁴ J s, c = 3.0 × 10⁸ m s⁻¹). E = hc / λ = (6.63 × 10⁻³⁴ × 3.0 × 10⁸) / 6.0 × 10⁻⁷ = 3.32 × 10⁻¹⁹ J.

Work function

W = hf₀

A metal has threshold frequency f₀ = 4.5 × 10¹⁴ Hz (h = 6.63 × 10⁻³⁴ J s). W = hf₀ = 6.63 × 10⁻³⁴ × 4.5 × 10¹⁴ = 2.98 × 10⁻¹⁹ J.

Einstein's photoelectric equation

hf = W + ½mv²max

Photon energy hf = 5.0 × 10⁻¹⁹ J strikes a metal of work function W = 3.0 × 10⁻¹⁹ J. ½mv²max = hf − W = 5.0 × 10⁻¹⁹ − 3.0 × 10⁻¹⁹ = 2.0 × 10⁻¹⁹ J (maximum kinetic energy).

Where marks are lost

Skipping units, rounding too early, and writing only the final answer (which loses method marks in Paper 2).

Practise these

Try each formula above with your own numbers, showing every line. Bring anything you get stuck on to a one-to-one lesson.

Formulas you use for Quantum Physics calculations

These foundation problems draw on the 4 relationships in Quantum Physics. None is printed in the exam, so recall each and write its symbols with units before substituting:

E = hf, Photon energy
E = hc / λ, Photon energy (wavelength form)
W = hf₀, Work function
hf = W + ½mv²max, Einstein's photoelectric equation

A worked example, with units on every line

Using E = hf (E = photon energy (J); h = Planck constant (J s); f = frequency (Hz)):

Light of frequency f = 5.0 × 10¹⁴ Hz (h = 6.63 × 10⁻³⁴ J s).
E = hf = 6.63 × 10⁻³⁴ × 5.0 × 10¹⁴ = 3.32 × 10⁻¹⁹ J.

Where the marks are, and the common mistakes

In Paper 2, calculation marks are awarded line by line: the formula, the substitution with units, and the final answer with its unit and sensible significant figures. Watch this trap: Use h = 6.63 × 10⁻³⁴ J s and f in hertz; the answer is in joules.

Divide by 1.6 × 10⁻¹⁹ to convert to eV. For foundation items, the numbers are direct, the marks are in showing the method, not just the answer.

Source: DSKP KSSM Physics Form 4 and 5 (Versi English) (Bahagian Pembangunan Kurikulum (BPK), KPM)

Written by the spmphysics.com.my editorial team.· Updated 5 Sept 2026