YR2_T1_LSN7

YR2_T1_LSN7
Topic 1.5
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Cette leçon contient 17 diapositives, avec quiz interactif, diapositives de texte et 1 vidéo.

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YR2_T1_LSN7
Topic 1.5

Slide 1 - Diapositive

Plan for today
  • Homework check (T1.3)
  • Explanation T1.5  

Slide 2 - Diapositive

Homework check:
  • Open the answers of T1.3 on Classroom
  • Correct your hw in a different colour.
  • Bring up your textbook and notebook when your name is called. 

Slide 3 - Diapositive

Topic 1.5 - Learning Goals:
I can...
  • Read a sound wave diagram and determine wavelength and amplitude
  • Calculate the frequency of a sound based on the wavelength
  • Label the parts of the ear and explain their function
  • Explain how the brain receives information about the different sound frequencies
  • Explain how hearing loss can occur as a result of exposure to loud sounds

Slide 4 - Diapositive

Topic 1.5 - Key Words:
  • Semicircular canals
  • Ossicles
  • Pitch
  • Auditory nerve 
  • Auricle
  • volume  

  • Cochlea
  • Amplitude 
  • Decibels
  • Eustachian tube
  • Frequency
  • Hertz (Hz)

Slide 5 - Diapositive

1.5 - Sound waves
Sound is a form of energy that travels in waves
  • It can only travel when there are molecules to pass on the sound wave
  • Waves are identified by pitch and by volume

The pitch is measured by the number of waves per second in Hertz (Hz)
The volume is measured by the amplitude of the sound wave in decibels (dB) 

Slide 6 - Diapositive

1.5 - Sound waves

Slide 7 - Diapositive

1.5 - Frequency
Frequency is the number of wavelengths per second (Hz) 
Wavelength: the time of one wavelength is expressed in seconds(s)


Formula: 

Slide 8 - Diapositive

What is the frequency
if one wavelenght is one millisecond?
A
10Hz
B
1000Hz
C
100Hz
D
1Hz

Slide 9 - Quiz

1.5 Ears are the detectors of sound

Slide 10 - Diapositive

1.5 - Ears are the detectors of sound:
  • Vibrations in the air cause the eardrum to vibrate.
  • This passes on the vibrations to the ossicles.
  • The ossicles vibrate the cochlea.
  • This transfers the signals to the auditory nerve.

Slide 11 - Diapositive

1.5 The cochlea detects different frequencies

Slide 12 - Diapositive

Slide 13 - Vidéo

1.5 Hearing age test

Slide 14 - Diapositive

1.5 - Ultrasound:
  • Humans can not hear very high pitched sounds 
  • These are called ultrasound

Doctors use ultrasound to check on the health of a baby in the womb

Slide 15 - Diapositive

1.5 - Sound can be used to locate objects
  • Bats use sound to locate their prey
  • Fishing boats use ultrasound to find a school of fish

Slide 16 - Diapositive

Hw for next time:
Theory lesson:
  • Complete the exercises of Topic 1.5 (p.42-46).
  • Study the glossary of Topics 1.5 on StudyGo.


Slide 17 - Diapositive