Across
- 1. / Which electromagnetic radiation is in the middle
- 3. / A reinforcement of sound in a vibrating body.
- 5. waves / Type of wave that can travel through a vacuum.
- 6. / A concave lens is also known as a.
- 7. / What electromagnetic radiation is used with a heat lamp.
- 8. / A unit of light energy.
- 9. / The change in wave frequency during the relative motion between a wave source and its observer.
Down
- 2. / What type of wave is a sound wave.
- 3. / Which electromagnetic radiation has the lowest frequency.
- 4. / A convex lens is also known as a.