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W.2 Sound and Light

Practice Worksheet — name: ______________________ date: ____________

Formulas for this topic

Index of Refraction n=cvn = \frac{c}{v}

Section A — Multiple choice

A1. Which of the following electromagnetic waves has the highest frequency?

  1. A Radio waves
  2. B Microwaves
  3. C Visible light
  4. D Gamma rays

A2. What is the normal line in reflection and refraction diagrams?

  1. A A line parallel to the surface
  2. B A line perpendicular to the surface at the point of incidence
  3. C The incident ray itself
  4. D The reflected ray itself

Section B — Short answer

B1. Explain why light refracts (bends) when entering glass from air.

B2. How does the pitch of a sound wave relate to its wave properties?

Answer key

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Section A

A1: Gamma rays

A2: A line perpendicular to the surface at the point of incidence

Section B

B1: Light refracts because its speed changes. Glass is optically denser than air, so light slows down and bends towards the normal line.

B2: The pitch of a sound wave is directly determined by its frequency. Higher frequency waves are perceived as higher pitch sounds.