# Lesson 8 — Pitch and frequency — Online

Pitch
and
Frequency
1 / 26
Slide 1: Tekstslide
Natuurkunde / ScheikundeMiddelbare schoolhavo, vwoLeerjaar 2

In deze les zitten 26 slides, met tekstslides.

## Onderdelen in deze les

Pitch
and
Frequency

#### Slide 1 -Tekstslide

Lesson plan
• Quick recap
• paragraph 5.5
• Checking the homework

#### Slide 2 -Tekstslide

Learning goals
• Describe the link between pitch and frequency

• Know the range of hearing of humans and of other animals

•  Know what is meant by ultrasound

•  Explain why music instruments have distinct sounds

Recap

• Wavelength
• Amplitude
• Frequency

#### Slide 5 -Tekstslide

Wavelength
The length of a wave (in cm, m, km)

Amplitude
The distance from the center of the wave to the highest or lowest point (in cm, m, km)

Frequency
The amount of waves per second (in hertz, Hz)

#### Slide 6 -Tekstslide

One block is 2 cm long
wavelength
•  8 cm

Amplitude
•  2 cm

Frequency
•  2 Hz

This snapshots has a duration of 1 second

#### Slide 7 -Tekstslide

One block is 2 cm long
wavelength
•  8 cm

Amplitude
•  2 cm

Frequency
•  2 Hz

This snapshots a duration of 1 second
This snapshots has a duration of 1 second

#### Slide 8 -Tekstslide

(in cm, m, km)
One block is 2 cm long
wavelength
•  8 cm

Amplitude
•  2 cm

Frequency
•  2 Hz

This snapshots a duration of 1 second
This snapshots has a duration of 1 second

#### Slide 9 -Tekstslide

One block is 2 cm long
wavelength
•  8 cm

Amplitude
•  2 cm

Frequency
•  2 Hz

This snapshots a duration of 1 second
2 Waves per second
This snapshots has a duration of 1 second

An oscilloscope

#### Slide 11 -Tekstslide

Amplification
The Amplitude of a wave...
...Determines the loudness of a sound

#### Slide 12 -Tekstslide

Pitch & frequency

#### Slide 14 -Tekstslide

The loudness of a sound is determined by its amplitude

#### Slide 15 -Tekstslide

The pitch of a sound is determined by its frequency

#### Slide 16 -Tekstslide

Pitch & frequency
Frequency: the amount of waves per second

Expressed in: Hertz (Hz)

High frequency— high pitch
Low frequency — low pitch

#### Slide 17 -Tekstslide

Which wave will create a higher pitch?

#### Slide 18 -Tekstslide

Pitch & frequency

• High frequency sound — short wavelength
• Low frequency sound — long wavelength
• The Frequency of a sound wave (pitch) does not affect the amplitude (loudness) of a sound wave.

Frequency

Amplitude
Pitch

Loudness

#### Slide 20 -Tekstslide

The audible range
20 Hz
20.000 Hz
Tone generator

#### Slide 21 -Tekstslide

The audible range
20 Hz
20.000 Hz
• All sound frequencies above 20.000 Hz are called Ultrasound

• All sound frequencies below 20 Hz are called Subsound

#### Slide 22 -Tekstslide

Hearing in Animals

#### Slide 23 -Tekstslide

The sound of music

#### Slide 24 -Tekstslide

Homework
5.6 workbook exercies

#### Slide 25 -Tekstslide

Learning goals
• Describe the link between pitch and frequency

• Know the range of hearing of humans and of other animals

•  Know what is meant by ultrasound

•  Explain why music instruments have distinct sounds