# 5.4: Loudness, Amplitude and oscilloscopes

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Slide 1: Tekstslide
ScienceMiddelbare schoolvwoLeerjaar 2

In deze les zitten 49 slides, met interactieve quizzen, tekstslides en 2 videos.

Lesduur is: 45 min

## Onderdelen in deze les

#### Slide 1 -Tekstslide

Learning  objectives
• Name the four properties of a wave (wavelength, amplitude, frequency, speed).
• Describe how the amplitude of a sound wave influences the sound it produces.
• Be able to read waveforms correctly.
• Name the formula for calculating frequency (f = 1/T) and be able to apply it in calculations
• Name the formula for wave speed (v = f x λ) and be able to apply it in calculations.

#### Slide 2 -Tekstslide

Four wave properties
1. Wave length
2. Amplitude
3. Frequency
4. Speed

#### Slide 4 -Video

Other examples of waves

v=fλ

#### Slide 8 -Tekstslide

Assignment:
The time that it takes for one complete wave cycle is 0,0025 s. Calculate the frequency and the speed of the wave.
G:  T= 0,0025 s
A:  f=? v=?
F:  f=1/T
C: f= 1/0,0025 = 400 Hz

#### Slide 11 -Video

DO
Read textbook page 100 and 101
Do questions textbook page 101
Do questions workbook page 48

#### Slide 14 -Tekstslide

It takes one soundwave to complete one wave in 0,0025s.
Calculate the frequency

#### Slide 16 -Open vraag

Open: https://www.szynalski.com/tone-generator/
In the recording a frequency of 500 Hz is used. Using the tone generator: play this tone. If you increase the frequency:
A. What do you hear?
B. What is the maximum frequency you can hear?

#### Slide 17 -Open vraag

If you decrease the frequency:
A. What do you hear?
B. What is the maximum frequency you can hear?

#### Slide 18 -Open vraag

Change the seconds/div to 2 ms
A. How much time does it take for 1 wave to complete
B. According to your measurement: what is the frequency?
C. Is this answer different to the previous question?

#### Slide 19 -Open vraag

Using the information of the previous 2 pages:
A. How much time does it take for 1 wave to complete
B. According to your measurement: what is the frequency?

#### Slide 20 -Open vraag

Put input to: live input (5V peak amplitude)

Make some noise. Loud and less loud. What happens to the amplitude?

#### Slide 21 -Open vraag

Using an oscilloscope: how can you see the loudness of a sound

#### Slide 22 -Open vraag

What can you read from a waveform shown on an oscilloscope

#### Slide 23 -Open vraag

1a.)  How many waves do you count in each of the following three pictures?
Image 1

#### Slide 24 -Tekstslide

1a.)  How many waves do you count in each of the following three pictures?
Image 1:
One wave.
Image 1

#### Slide 25 -Tekstslide

1b.) How many waves do you count in each of the following three pictures?
Image 2

#### Slide 26 -Tekstslide

1b.) How many waves do you count in each of the following three pictures?
Image 2
Image 2:
Two waves

#### Slide 27 -Tekstslide

1c.) How many waves do you count in each of the following three pictures?
Image 3

#### Slide 28 -Tekstslide

1c.) How many waves do you count in each of the following three pictures?
Image 3
Image 2:
Four waves

#### Slide 29 -Tekstslide

2a.)  If one block is 2cm wide, what is the wave length of this wave?
Image 1

#### Slide 30 -Tekstslide

2a.)  If one block is 2cm wide, what is the wave length of this wave?
Image 1
Image 2:
16 cm

#### Slide 31 -Tekstslide

2b.)  If one block is 2cm wide, what is the wave length of this wave?
Image 2

#### Slide 32 -Tekstslide

2b.)  If one block is 2cm wide, what is the wave length of this wave?
Image 2
Image 2:
8 cm

#### Slide 33 -Tekstslide

2c.)  If one block is 2cm wide, what is the wave length of this wave?
Image 3

#### Slide 34 -Tekstslide

2c.)  If one block is 2cm wide, what is the wave length of this wave?
Image 3
Image 2:
4 cm

#### Slide 35 -Tekstslide

3) Which of these two waves has a higher amplitude? Explain.
Image 1
Image 2

#### Slide 36 -Tekstslide

3) Which of these two waves has a higher amplitude? Explain.
Image 1
Image 2

#### Slide 37 -Tekstslide

4) Listen to these two sounds. Of which does the sound wave have a higher amplitude?
Sound A
Sound B
• Make sure to be in presentation mode.
• Click the icon to play the sound.
• Make sure to keep the volume of your computer the same!

#### Slide 38 -Tekstslide

4) Listen to these two sounds. Of which does the sound wave have a higher amplitude?
Sound A
Sound B
• Make sure to be in presentation mode.
• Click the icon to play the sound.
• Make sure to keep the volume of your computer the same!
The soundwaves of sound B have a higher amplitude, because the sound is louder.

#### Slide 39 -Tekstslide

5) Which of these two sound waves will produce a louder sound? Explain.
Image 1
Image 2

#### Slide 40 -Tekstslide

5) Which of these two sound waves will produce a louder sound? Explain.
Image 1
Image 2
The soundwaves of imag 2, because they have a higher amplitude.

#### Slide 41 -Tekstslide

6) Describe what the amplitude of the wave and what the amplitude of a sounds wave says about that sound.

#### Slide 42 -Tekstslide

6) Describe what the amplitude of the wave and what the amplitude of a sounds wave says about that sound.
The height of the peak of a wave measured from the center.

#### Slide 43 -Tekstslide

6) Describe what the amplitude of the wave and what the amplitude of a sounds wave says about that sound.
The height of the peak of a wave measured from the center.
The loudness of a sound.

#### Slide 44 -Tekstslide

6) Describe what the amplitude of the wave and what the amplitude of a sounds wave says about that sound.
The height of the peak of a wave measured from the center.
The maximum displacement of wave compared to it's rest position.
The loudness of a sound.

#### Slide 45 -Tekstslide

Bonus
1. What do you think happens to the loudness of a sound when two soundwaves meet?

Interference

#### Slide 47 -Tekstslide

Bonus
2. Are sound waves the only form of waves? If not, list other examples of waves.

#### Slide 48 -Tekstslide

Bonus
3. Does the medium (for example air, or water) through which a wave moves move with the wave?