Chapter14LightSound

Chapter 14-Light and Sound Pgs.408-425 =*How do sound and light travel?= 1.__Compression__-the part of the wave where the particles are close together.

2.__Frequency__-the number of times a wave makes a complete cycle in a second.

3.__Wavelength__- distance between one point on a wave to the next similar point on a wave the faster the vibration is,the shorter the wavelengths will be.

4.__Pitch__- a measure of whether a sound seems high or low.

5.__Reflection__- the bouncing back of a wave off and object or suface.

6.__Absorption__- the taking in of light energy by an object.

7.__Transparent__- describes meterials that let nearly all the light rays that hit them pass through.

8.__Translucent__- describes materials that let some light rays pass through but scatar light pass through them.

9.__Opaque__-describes materials that do not let light pass through.

10.__Refraction__-bending of light caused by the change of speed that occurs when light rays pass from one transparent medium to another. __Energy__- light and sound are forms of energy. Sound is created when air vibrates. Sound does not travel at the same speed. Light travels in a straight line called rays. High frenquency- if somethings vibrates fast. A light wave can travel through a vacuum but a sound wave cannot. Absorption can change light energy to heat energy. Red apples have the color red becauseit reflects the light waves of red frenquencies. The most importantlight source is the sun because without the sun, there would be no plants to harvest and eat. Without plants, we cant live on Earth. Earth is also cold and dark without the sun. Colors that make up the visible light spectrum in order from left to right are: Red Orange Yellow Green Blue Violet Sound travels fastest in solids and slowest in gases. Why? Vibrations pass quickly through the particles of most solids. Those particles are strongly attracted to each other so the sound moves quickly. In a gas, the particles are not attracted to each other, not easily compressed, and do __not__ bounce back so sound travels more slowly. of waves || types of materials that interact with light || Charcteritics of sound waves ||
 * charcteritics
 * opaque || reflection || pitch ||
 * wavelength || absorption ||  ||
 * compression || refraction ||  ||
 * frequency || transparent ||  ||
 * || translucent ||  ||

__Sound__-A form of energy that travels in waves. sounds occur when objects vibrate.

__Transverse-__ Wave-The wave travels forward.

__Wavelength-__ affections frenquency(how often a wave psses a particualr point in a certain amount of times).

12-6-10

__pitch__- depends on a sounds frequency

12-7-10

Lihgt has things in common with sound: (1) Both forms of energy. (2) Both travel in waves.

The sun is our most important light source. Without the sun, the earth would be too cold and too dark to live on. Plants convert or change sunlight into chemical energy witch they use to make thier own food. People and animals eat the plants. Light travels straight lines called __rays__.

12-8-10

__electromagnet radiation-__ light energy White is a blend of the colors of the rainbow. The colors appear in a particular order because of thier wave length and frequency. It starts from the left, and ends in the right.

ROY G BV R=red O=orange Y=yellow G=green B=blue V=violt Red has the longest wavelength with the lowest frequency Violet has the shortest wavelength and the highest frequency.

__Lesson 4__ Light waves travel in a straight line. Light can change when it hits an object: (1) the light rays can __pass through__ an object (2) they may __reflect__ off an object (3) they may be __absorbed__ by the object

__reflection__- is when the light rays bounce (or reflect) off a surface back to our eyes. __Absorption__- when light rays are taken in by an object and then becomes a form of __heat energy__ 12-13-10

p.430 #s 1-12 p.431 # 16-20

1.Clear glass is an example of a (n) transparent material. 2.Light rays cannot pass through a material that is 3.A sound wave with a high frequncy will also have a high 4.The distance from one point on a wave to the next similar point on a wave is known as 5. is bending that results from a light wave changing speed as it moves at an angle from one medium to another. 6.When a wave is taken in by an object occurs? 7.Materials that let some of the other rays are 8.A wave bouncing back off an object or surface is known as ? 9.A (n) is the part of a sound wave where particals are close together. 10.The number of times a wave makes a complete cycle in a second is its 11.Explain why a wave with a short wavelength has a high frequency. 12.Why does a light wave travel more slowy through a gas than through a vacum? 16.A sound wave cannot travle through a. A Gas B Liquid C.Solid D.vacum 17.To hear a higher -pitched note on a guitar string you should? 18.Radio waves ultravilote rays and gamma rays are all? 19 explain why 18 answer is the best. 20 Write a paragraph explaining what happens to a ray of sunlight as it passes through a clear glass filled with water.