Grade-9 Sound

SCIENCE
GRADE-9
NOV 1, 2020
Ms. Famin
1 / 29
volgende
Slide 1: Tekstslide
physics, scienceSecondary Education

In deze les zitten 29 slides, met interactieve quizzen, tekstslides en 1 video.

Onderdelen in deze les

SCIENCE
GRADE-9
NOV 1, 2020
Ms. Famin

Slide 1 - Tekstslide

Slide 2 - Video

OBJECTIVES 
Describe how sound waves are produced
Relate the speed an temperature of sound waves with the materials used.

Slide 3 - Tekstslide

Interpret 
What do all sounds have in common?
How is sound produced?

Slide 4 - Tekstslide

video 

Slide 5 - Tekstslide

Sound waves
Sound is a longitudinal wave, meaning that the motion of particles is along the direction of propagation
Transverse waves—water waves, light—have things moving perpendicular to the direction of propagation

Slide 6 - Tekstslide

Analyze 
How do vibrating object produce sound waves?

Slide 7 - Tekstslide

Slide 8 - Tekstslide

Where do you think the sound moves faster?
timer
1:00

Slide 9 - Open vraag

Predict - Would a barking dog produce sound waves that travel faster during the day r night?

Slide 10 - Open vraag

TRIVIA 
The speed of the sound wave in a material increases as the temperature of the material increases
a sound wave in air travels faster on a warm, summer day than on a cod winter day

Slide 11 - Tekstslide

SCIENCE 
GRADE-9
NOV 2, 2020
Ms.Famin 

Slide 12 - Tekstslide

in which case is the speed of sound more

Slide 13 - Tekstslide

objectives 
Relate the speed of sound waves and temp on different materials.
describe the parts and function of human ear 

Slide 14 - Tekstslide

recall 

Slide 15 - Tekstslide

RECALL 

Slide 16 - Tekstslide

In which material do sound waves travel fastest?
A
aluminum
B
ethanol
C
carbon dioxide
D
water

Slide 17 - Quizvraag

What is the area of low density in a sound wave called?
A
wavelength
B
compression
C
rarefaction
D
amplitude

Slide 18 - Quizvraag

What is a longitudinal wave?
A
a wave in which the electromagnetic field changes parallel to the direction of the wave
B
a wave in which the electromagnetic field changes perpendicular to the direction of the wave
C
wave in which particles in matter move perpendicular to the direction of the wave
D
wave in which particles in matter move in the same direction as the wave

Slide 19 - Quizvraag

FIRST 
steel at 0 C
water at OC
water at 30 C
air at 0C
air at 30 C

Slide 20 - Sleepvraag

CHALLENGE- If a sound wave travels at 1, 620 m in 3 s, what is its speed?
[DO NOT FORGET THE UNIT]

Slide 21 - Open vraag

CHALLENGE- At 331 m/s, how far would sound
travel in 0.5 seconds? [do not forget units ]

Slide 22 - Open vraag

Slide 23 - Link

Slide 24 - Tekstslide

Slide 25 - Link

Functions of parts of ear
  • the outer ear- collects sound waves. the ear canal channels sound waves into the middle ear.
  • The middle ear- It amplifies sound waves. It has eardrum and three tiny bones-hammer, anvil and stirrup. When sound hits ear drum it vibrates and the three bones amplify
  • The inner ear- it converts vibrations to nerve signals thta travels to brain. It has small fluid like chamber called cochlea. 

Slide 26 - Tekstslide

Which part of the ear acts as the amplifier?
A
cochlea
B
nerves
C
inner ear
D
middle ear

Slide 27 - Quizvraag

Which part of the ear converts vibrations to nerve signals ?
A
inner ear
B
outer ear
C
middle ear
D
ear canal

Slide 28 - Quizvraag

Slide 29 - Tekstslide