Atomic Physics · SHS3 Physics

Lesson notes

Learning Objectives

Indicator: 3.4.1.LI.3 - Calculate the energy, frequency and wavelength of x-rays.

By the end of the lesson, learners can:

Recall the relationship between photon energy, frequency, and wavelength using E = hf and c = fλ.
Calculate the energy of an x-ray photon given its frequency or wavelength, using Planck’s constant (h = 6.63 × 10⁻³⁴ J·s).
Calculate the frequency of x-rays when given the photon energy, and express answers in appropriate SI units (Hz, keV, nm).
Determine the wavelength of x-rays from the photon energy or frequency, using c = 3.0 × 10⁸ m/s.
Solve multi-step word problems involving conversions between electron volts (eV) and joules (J), applying the skills to realistic medical and industrial x-ray scenarios.

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Curriculum details

Strand: Atomic and Nuclear Physics (Strand 4)
Sub-strand: Atomic Physics (4.1)
Content standard: 3.4.1.CS.1 - Demonstrate knowledge and understanding of the production of x-rays. 3.4.1.LO.1 Recognise the applications of x-rays in medicine, and other industrial sectors.
Indicator: 3.4.1.LI.3 - Calculate the energy, frequency and wavelength of x-rays.
Suggested placement: Semester 2, Week 17 (Week 37 of the year)
Our suggestion, laid out in curriculum order across three terms of twelve weeks. NaCCA does not fix the week, so follow your school's scheme of learning.
Curriculum reference: NaCCA curriculum document, p. 198

Exemplars (from the NaCCA curriculum)

Experiential learning: Let learners employ their knowledge in calculating the energy of a photon to determine the frequency of x-rays produced.
Provide equitable access to resources and opportunities.
Assessment (3.4.1.AS.3). The document marks these depth-of-knowledge levels for this indicator: Level 2 Skills of conceptual understanding.
Teaching and Learning Resources:
- Audio-visuals
- Internet
- Projectors
- YouTube
- Interactive virtual laboratory