This lesson contains 21 slides, with text slides and 1 video.
Lesson duration is: 45 min
Items in this lesson
5.7 Echoes
Slide 1 - Slide
This lesson
Recap
Echoes
Practice exercises
Time to study
Slide 2 - Slide
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 - Slide
Recap
Slide 4 - Slide
The distinct sound of
musical instruments
Slide 5 - Slide
Main frequency
(the fundamental)
with other frequencies mixed in (harmonics)
Slide 6 - Slide
Slide 7 - Slide
The distinctive sound that an instrument makes is called its timbre
Slide 8 - Slide
The mach system
How does it work?
What is mach 1
What is mach 2
What is mach 3?
Slide 9 - Slide
Slide 10 - Slide
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 - Slide
5.6 Making simple calculations
Speed=timedistance
v=td
v: speed (m/s)
d: distance (m)
t: time (s)
Slide 12 - Slide
5.7 Echoes
Slide 13 - Slide
Slide 14 - Video
Slide 15 - Slide
Echo location
Slide 16 - Slide
Slide 17 - Slide
Slide 18 - Slide
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 - Slide
Worksheet waves
Slide 20 - Slide
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
Lesson duration is: 45 min
