Page 526 - SUBSEC October 2017_Neat

UNIT 1
MODULE 2: OSCILLATIONS AND WAVES (cont’d)

SPECIFIC OBJECTIVES EXPLANATORY NOTES SUGGESTED PRACTICAL
ACTIVITIES

Properties of Waves (cont’d)

Students should be able to:

2.23. define refractive index in See Appendix II for
terms of velocity of suggested practical activity.
waves;

2.24. use Snell’s Law; n sin(θ )=n sin(θ )
2
1
1
2

2.25. explain total internal Use two media with indices Use same suggested
reflection; n and n . practical activity for Specific
2
1
Objective 2.23.

2.26. determine the value of
critical angle; and,

2.27. discuss practical For example, fibre optic
applications of total cables.
internal reflection.

3. Physics of the Ear and Eye

Students should be able to:

3.1. discuss the response of the Consider sensitivity, Download and use an
ear to incoming sound frequency response and audiometer to demonstrate
waves; intensity. Precise numerical the difference in hearing
values related to the thresholds for individuals.
response of the ear are not Focus on the change in
required. thresholds with age.

Play high frequency tones
above 10 kHz to check
whether all individuals can
hear.

3.2. state the orders of
magnitude of the threshold
of hearing and the intensity
at which discomfort is
experienced;

CXC A16/U2/17 26