SHS3 Physics · Semester 2 Week 17: Atomic Physics

Lesson notes

Learning Objectives

Indicator: 3.4.1.LI.2 - Distinguish between hard x-rays and soft x-rays

By the end of the lesson, learners can:

Define hard x-rays and soft x-rays in terms of their energy, frequency, wavelength and penetrating power.
Compare and contrast hard x-rays and soft x-rays using at least four distinguishing characteristics.
Explain how the voltage applied to an x-ray tube determines whether hard or soft x-rays are produced.
Classify given x-ray applications as using either hard or soft x-rays, based on the depth of penetration required.
Justify the choice of hard or soft x-rays for specific medical and industrial situations.

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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.2 - Distinguish between hard x-rays and soft 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: From the video learners must also come out with the characteristics and uses of x-rays.
Challenge stereotypes and misconceptions about gender and disabilities in radiation physics.
Assessment (3.4.1.AS.2). 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