LIGHT and SOUNDPrepared by: Ms. Hernani

Light

Observe the following illustrations.

By pair activity: (A.S # 1.12)Light

1. Describe the illustrations in one sentence only.2. What are the major colors that comprises visible light?3. How does the color of the light is determined or arranged?4. Who do you think first discovered this concept on electromagnetic spectrum?5. Describe the energy each color in the light spectrum possesses.6. Which of the colors is bent the least and bent the most? Why do you think so?

dispersion - light is separated into its colors due to its differences in degrees of refractions.

NOTE: The primary colors of light are red, blue, and green which produces white light when combined.

Secondary colors include yellow (r+g), cyan (g+b), and magenta (r+b).

Light

Observe the table below:

Describe the table based on your own understanding.

Light

COLOR Wavelength (m)

frequency

Red 6.2 x 10 -7 4.8 x 10 14

Orange 6.0 x 10 -7 5.0 x 10 14

Yellow 5.8 x 10 -7 5.2 x 10 14

Green 5.4 x 10 -7 5.5 x 10 14

Blue 4.8 x 10 -7 6.3 x 10 14

Violet 4.4 x 10 -7 6.8 x 10 14

Wave properties of light:

1. Refraction -light can be deflected upon passing from one medium to another

2. Reflection-light can be bounced off a surface

Light

Wave properties of light:

3. Diffraction-slight bending of light as it passes around the edges or corner of an object

4. Interference-interaction of waves that are correlated of coherent with each other-has two forms: constructive and destructive interference

Light

SOUND

Act. # 1.13: Individual ActivityFill-out the Frayer Model

Characteristics:1.2.3.

Factors affecting the speed of sound:1.2.3.

Comparison of light and sound:1.2.3.

Non-examples:

1.2.3.

Sound

SOUND

Factors affecting the speed of sound

Sound

1. Density of the medium

- sound waves move well through dense materials *metal or wood (sound moves well, molecules are close together) *air density – high altitude (low movement; molecules are far apart)

- low altitude (faster movement; because molecules are nearer from each other)

Factors affecting the speed of sound

Sound

2. Elasticity of the Medium

- sound waves moves fast through elastic materials (molecules return quickly to its original position after a disturbance)

*sound travels fastest in metals and slowest in air

Factors affecting the speed of sound

Sound

3. Temperature of the Air

- sound waves travel faster in warm air, than through cool air (speed increases by 0.6% as per 1 degree Celsius increase in temp.)

*in liquids and solids, temperature has less effect in the speed of sound because molecules are close together