Lesson 6 — 5.3 Detecting sounds

• Natuurkunde / Scheikunde
• Middelbare school
• havo, vwo
• Leerjaar 2

Period 2

Sound

This lesson

• Recap
• Loudness and the decibel-scale
• Frequency, wavelength and amplitude
•  Working independently

Learning goals

•  Name the unit of loudness
• Explain how the decibel scale works
• Describe 3 ways to reduce the risk of loud sounds

Recap

What did we cover previous lesson?

Outer ear

• Collect sounds waves, channels them to the middle ear
  

Middle ear

•  Amplifies the sound waves

Inner ear

• Turns the wave pattern into an electric signal so that it can be send to the brain through nerves

Four types of hearing loss

•  A hole in your ear drum — this heals over time

•  Getting wax build up in your ear — this can be removed

• An ear infection, fluid builds up in your middle and inner ear.

• Your auditory nerve or system can get damaged or be fautly

A simulation

Link

The 

decibel-scale

The decibel-scale

• The unit of Loudness: decibel (dB)
  
• its a relative scale

• every 10 dB increases the intensity 10 times
• For example:

The decibel-scale

Every 10 dB increases the intensity 10 times

For example:

• A 40 db sounds is 10 times louder as 30 db sound.
  
• A 50 db sounds is 100 times louder as a 30 db sound (10 x 10)
• A 60 db sound is 1000 times louder as a 30 db sound (10 x 10 x 10)

Frequency, amplitude

& wavelength

Watch the video, write down what is meant by:

• Frequency
  
• Amplitude
  
• Wavelength
  

What is meant by...

• Amplitude
  
• Frequency
  
• Wavelength
  

A simulation

Link

Working independently

Read: 5.3

Read 5.4

Do: yellow block exercises 5.3

Do: Workbook exercises 5.3

Learning goals

•  Name the unit of loudness
• Explain how the decibel scale works
• Describe 3 ways to reduce the risk of loud sounds