1. BELL WORK Answer the following questions on a piece of paper. You will correct these and turn in your answers. 1. Draw a picture of a wave with LOW frequency and LOW amplitude. 2. Draw a picture of a wave with HIGH frequency and LOW amplitude 3. What changes the speed of a sound wave? (think of the medium it passes through) 4. Describe convection. Draw a picture to show it. 5. Describe conduction. Draw a picture to show it.

2. LIGHT WAVES Light is transferred by radiation Visible light has a large wave of wavelengths The color of light depends on its wavelength

3. All e/m waves travel through free space at a speed of approximately 3.00 x 10 8 m/s or 186,000 miles/sec. This speed is known as the speed of light. Light, radio, x-rays, and gamma rays are some examples of e/m waves. No medium is needed for ELECTROMAGNETIC waves.

4. TYPES OF LIGHT - TRANSPARENT Transparent Light –The physical property of allowing light to pass through the material without being scattered. You can see directly through transparent light. Examples – jelly fish, water, glass

5. TYPES OF LIGHT - TRANSLUCENT Translucent light allows light to pass through, but it is diffused so persons or objects on the opposite sigh are not clearly visible. Example: Frosted glass, sheer material (like a shawl)

6. OPAQUE You can NOT see through an opaque substance. It will not reflect any light on the other side. EXAMPLES: heavy lead mats used for x-rays, solid objects, such as wood or lead

7. BELL WORK – WEDNESDAY 11/4 Answer the following questions carefully. 1. Draw a picture of a wave with high amplitude and high frequency. 2. What does Hz measure? 3. What is the speed of light in meters? 4. Give an example of a translucent object. 5. Is this object transparent, translucent, or opaque?

8. The displacement of the particles of the medium is perpendicular to the direction of wave propagation. TRANSVERSE

9. LONGITUDINAL The displacement of the particles The displacement of the particles of the medium is parallel to the of the medium is parallel to the direction of wave propagation. direction of wave propagation.

10. Reflection Reflection the turning back of a wave when it reaches the boundary of the medium through which it is traveling

11. Law of Reflection Law of Reflection the angle of incidence is equal to the angle of reflection

12. bending obliquely different propagation speed the bending of a wave as it passes obliquely from one medium into another of different propagation speed Refraction For refraction to occur, the wave must change speed and must enter the new medium at an oblique angle.

13. Diffraction the spreading of a wave around a barrier or through an opening

14. Interference the result of the superposition of two or more waves Superposition Principle the displacement of the medium when two or more waves pass through it at the same time

15. Constructive larger amplitude results in a larger amplitude Types of Interference Destructive smaller amplitude results in a smaller amplitude