Bell ringer Sheet

Glue the Bell Ringer sheet into your IAN notebook

(Page 36 IAN)

Complete Mondays Bell Ringer

MYP Unit Question: Can you Hear or See me NOW?

Area of Interaction: Health and Social EducationLearner Profile: Thinkers Standard: S8P4.Students will EXPLORE the wave nature of sound and electromagnetic radiation. f. Diagram the parts of the wave and explain how the parts are affected by changes in amplitude and pitch. EQ: How does changing the frequency or height of a wave affect its sounds?Learning Target: Today I am learning about the sound waves because they help me to hear (when I want to…). Homework: Study for upcoming quiz on FRIDAY

1- Increase wavelength•2- Decrease wavelength•3- Increase amplitude

•4-Decrease wave amplitude

1- Describe what happens to the PITCH when we increase wavelength.

2- Describe what happens to PITCH when you decrease wavelength

3- Describe what happens to the sound when you increase AMPLITUDE.

4- Describe what happens to the sound when you decrease the amplitude

1- The PITCH DECREASES when we increase wavelength.

2- The PITCH INCREASES when you decrease wavelength

3- The sound gets LOUDER when you increase amplitude.

4- The sound gets QUIETER when you decrease the amplitude

•Draw a diagram of what each wave should look like .

Size of Wavelength Amplitude –SOUND Waves

A

B

c

D

• The Most Haunted team left their microphones and oscilloscope in

the Haunted House overnight and the following sound waves were recorded during the night.• Can you match the sound waves to the correct ghosts and explain

why you think you are correct

Recall Characteristics:•Sound waves are mechanical waves.•Mechanical waves require a medium (something to travel through).•Similar to light waves, sound waves can be reflected (echo).

1. Vibration: back and forth motiona.There can not be sound if

there is not any vibrationb.Most vibrations are too

fast for you to see.c. Vibrations require energy—

sound is a form of energy.

2. When something vibrates molecules in the air crowd together, then spread apart, causing sound waves to travel away from the vibrating object

1. Gas: sound travels easily through gasesa. It travels about 1,129 feet per second through air.

(That’s how fast it travels when you talk!)

2. Liquids: Sound travels through water about 4,794 feet per second. (Think of what ripples look like in the water and how they spread.)

3. Solids: Sound travels through a solid like wood at a rate of 12,620 feet per second. Sound travels fastest through solids!

4. Sound cannot travel through a vacuum (a space that is “empty” of matter).

1. Pitch: How high or low a sound is

a. The higher the pitch the more “squeezed” together the waves are

b. The higher the pitch the higher the frequency

c. The lower the pitch the lower the frequency

• Frequency describes the number of waves that pass a fixed place in a given amount of time.

• Loudness: How much energy a sound wave carries.• The louder the sound, the higher the

amplitude.

Change Decrease

wavelength

Increase

amplitude

Predict

Observed

• How will the sound be affected by changes in wavelength and amplitude?

• Make a data table. Predict, watch and listen.

• Record observations.

• Begin with: Sound waves are mechanical waves and require…• Use complete sentences (minimum of

4).• Include all key terms (mechanical,

medium, frequency, pitch, amplitude, loudness).

• Mosquito Ringtones and Dog Whistles!• Different animals can hear high pitch sounds that

humans cannot.• Young people can hear higher pitch sounds more

than old folks.

A. Reflected sound is called an echo.1. The vibrations are reflecting

back to you.B. Soft, air-filled objects absorb sound.

1. When sound is absorbed, you do not hear it because it is not reflected back to you.

A. Sound vibrations occur in waves that go out in every direction like a circle.

1. Sound waves are created by repeated patterns of molecules spreading apart and squeezing together.

B. Sound Waves have 3 common features:1. They:

a. Have a set wavelength b. Vibrate at different speeds

--Frequency: the number of complete wavelengths, or times an object vibrates per

second.

c. Carry Energy--amplitude is the amount

of energy a wave has--high amplitude sound is

made by objects with great vibrating motion

Making and Hearing Sounds1. Hearing Sound

a. Humans have two ears on opposite sides of their heads. Each ear gathers sound waves on each side of your body.b. There are two ways that humans hear sounds.

• With your ears.• With your brain.

1. Sound causes your eardrum to vibrate. The eardrum vibrates differently for each sound.

2. The bones of your ear begin to vibrate, beginning with the hammer, moves to the anvil, and finally the stirrup.

3. The sound energy passes to the inner ear. This causes the fluid in the cochlea to move.

4. The nerves then carry the message to the brain.

5. Your brain then tells you what the sound is.

2. Making Sound• All sounds are made by vibrations.• Humans make sound waves by using

their voice.• The human voice is also made by

vibrations. • The source of sound in humans is the

vocal cords.• Vocal cords — 2 thin, elastic, bands of

tissue that vibrate to produce sound.

1. Air from the lungs flows through the windpipe and into the voice box (where the vocal cords are).

2. Then the air pushes the vocal cords apart making them vibrate.

3. The vibrations create a series of sound waves that exit through your mouth.

4. The change of shape of the vocal cords changes the sound and its pitch.

5. If you can’t talk because of a cold or laryngitis, it is because your vocal cords are swollen and inflamed.

• Voice – allows you to communicate with others.• Morse Code – code for numbers and letters

using sound• Sonar – a device that sends sound waves

through water to measure or find something.• Animal sounds• Musical instruments