Cette leçon contient 21 diapositives, avec diapositives de texte et 1 vidéo.
La durée de la leçon est: 45 min
Éléments de cette leçon
5.7 Echoes
Slide 1 - Diapositive
This lesson
Recap
Echoes
Practice exercises
Time to study
Slide 2 - Diapositive
Learning goals
Recap — Explain the mach system, how instruments get their distinct sound and how to calculate the speed of sound.
Explain in your own words how echoes work.
Describe how echo location works.
Be able to do calculations involving echoes and echo location
Slide 3 - Diapositive
Recap
Slide 4 - Diapositive
The distinct sound of
musical instruments
Slide 5 - Diapositive
Main frequency
(the fundamental)
with other frequencies mixed in (harmonics)
Slide 6 - Diapositive
Slide 7 - Diapositive
The distinctive sound that an instrument makes is called its timbre
Slide 8 - Diapositive
The mach system
How does it work?
What is mach 1
What is mach 2
What is mach 3?
Slide 9 - Diapositive
Slide 10 - Diapositive
Mach 1, Mach 2, Mach 3
Mach 1: traveling at 343 meters per seconds
Mach 2: traveling at 686 meters per seconds
Mach 3: 1029 meters per seconds
The fastest skydiverer, Felix Baumgartner, traveled at mach 1.1, how fast did he fall?
Slide 11 - Diapositive
5.6 Making simple calculations
Speed=timedistance
v=td
v: speed (m/s)
d: distance (m)
t: time (s)
Slide 12 - Diapositive
5.7 Echoes
Slide 13 - Diapositive
Slide 14 - Vidéo
Slide 15 - Diapositive
Echo location
Slide 16 - Diapositive
Slide 17 - Diapositive
Slide 18 - Diapositive
Calculation exercise
A man has set out the find the deepest well in the world. Once he found it he clapped his hands above it. He timed how long it took before he heard an echo. It took 71.4 seconds. The speed of sound in air is 330 m/s.
Calculate how deep the well is.
Slide 19 - Diapositive
Worksheet waves
Slide 20 - Diapositive
Learning goals
Recap —Explain the mach system, how instruments get their distinct sound and how to calculate the speed of sound.
Explain in your own words how echoes work.
Describe how echo location works.
Be able to do calculations involving echoes and echo location
La durée de la leçon est: 45 min
