# Lesson 11 — 1st online lesson

Sound calculations
1 / 16
Slide 1: Tekstslide
speed calculationsVoortgezet speciaal onderwijsLeerroute 2

In deze les zitten 16 slides, met interactieve quizzen, tekstslides en 1 video.

## Onderdelen in deze les

Sound calculations

#### Slide 2 -Video

Learning goals
• Learn to calculate the speed of sound using distance and time

• Learn to calculate the speed of sound using wavelength and frequency

#### Slide 3 -Tekstslide

Two formulas to calculate the speed of sound

#### Slide 4 -Tekstslide

Two formulas to calculate the speed of sound
speed=timedistance

#### Slide 5 -Tekstslide

Two formulas to calculate the speed of sound
speed=timedistance
speedofsound=wavelengthfrequency

#### Slide 6 -Tekstslide

speedofsound=wavelengthfrequency
• Frequency: The amount of waves in one second

• Wavelength: the length of one wave

• Frequency • wavelength = the distance traveled in one second

#### Slide 7 -Tekstslide

speed=timedistance
v=td
• v: speed in m/s
• d: distance in m
• t: time in s

#### Slide 8 -Tekstslide

speed=timedistance
v=td
• v: speed in m/s
• d: distance in m
• t: time in s

3=26

#### Slide 9 -Tekstslide

• vs: the speed of sound (m/s)
• λ: wavelength (m)
• f: frequency (Hz)

speedofsound=wavelengthfrequency
v= λ • f

#### Slide 10 -Tekstslide

• vs: the speed of sound (m/s)
• λ: wavelength (m)
• f: frequency (Hz)

speedofsound=wavelengthfrequency
v= λ • f
6=23

#### Slide 11 -Tekstslide

Someone makes a yell in a mountain valley. The closest mountain is at a distance of 411,6 meters away from them. The speed of sound in air is 343 m/s.  How long will it take before they hear the echo?
A
4,8 seconds
B
3 seconds
C
5 seconds
D
2,4 seconds

#### Slide 12 -Quizvraag

Given:
• v = 343 m/s
• d = 411,6 m x 2 = 823,2 m

• How long will it take before they hear the echo?

Formula:
•  v = d/t     —>       t = d/v

Calculation:
•  t = 823,2 / 343 = 2,4 s
Someone makes a yell in a mountain valley. The closest mountain is at a distance of 411,6 meters away from them. The speed of sound in air is 343 m/s. How long will it take before they hear the echo?

#### Slide 13 -Tekstslide

A sound wave traveling through copper has a frequency of 400Hz. It has a wavelength of 5,65m.

Calculate the speed of sound in copper.

A
70.8 m/s
B
600 m/s
C
2260 m/s
D
2460 m/s

#### Slide 14 -Quizvraag

Given:
• Frequency = 400 Hz
• Wavelength = 5.65 m

• Calculate the speed of sound in copper

Formula:
•  Speed of sound = wavelength • frequency

Calculation:
•  Speed of sound = 400 x 5,65 = 2260 m/s
A sound wave traveling through copper has a frequency of 400 Hz. It has a wavelength of 5,65 m. Calculate the speed of sound in copper.

#### Slide 15 -Tekstslide

Learning goals
• Learn to calculate the speed of sound using distance and time

• Learn to calculate the speed of sound using wavelength and frequency