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.

LIGHT WAVES Light is transferred by radiation

Visible light has a large wave of wavelengths

The color of light depends on its wavelength

All e/m wavesAll e/m waves travel through freetravel through freespace at a speed of approximatelyspace at a speed of approximately

3.00 x 103.00 x 1088 m/s m/s oror 186,000 miles/sec 186,000 miles/sec..

This speed is known as theThis speed is known as the speed of lightspeed of light..

Light, radio, x-rays, and gamma raysLight, radio, x-rays, and gamma raysare some examples of e/m waves. are some examples of e/m waves.

No medium is needed forNo medium is needed forELECTROMAGNETICELECTROMAGNETIC waves.waves.

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

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)

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

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?

The displacement of the particlesThe displacement of the particlesof the medium isof the medium is perpendicularperpendicular totothe direction of wave propagation.the direction of wave propagation.

TRANSVERSE

LONGITUDINAL

Reflectionthe the turning backturning back of a wave when of a wave whenit reaches the it reaches the boundaryboundary of the of the

medium through which it is travelingmedium through which it is traveling

Law of Reflectionthe the angle of incidenceangle of incidence is is equalequal

to the to the angle of reflectionangle of reflection

the bendingbending of a wave as it passes obliquelyobliquely from

one medium into another of different propagation different propagation

speedspeed

RefractioRefractionn

For refraction to occur, the waveFor refraction to occur, the wavemust change speed and must entermust change speed and must enterthe new medium at an oblique angle.the new medium at an oblique angle.

DiffractionDiffractionthethe spreadingspreading of a of a

wavewavearound a barrier oraround a barrier orthrough an openingthrough an opening

Interferencethe result of the the result of the superpositionsuperposition

of two or more wavesof two or more waves

Superposition Principlethe displacement of the medium whenthe displacement of the medium when

two or more waves pass throughtwo or more waves pass throughit at the same timeit at the same time

ConstructiveConstructiveresults in a larger amplitudelarger amplitude

Types of InterferenceTypes of Interference

DestructiveDestructiveresults in a smaller amplitudesmaller amplitude