Grade 10 Longitudinal Waves_Lesson...pdf

Introduction to Longitudinal Waves

1. Grade 10 Physical
Sciences:
Longitudinal Waves

2. LESSON OUTCOMES
ExploreExplore motion using simulation
IdentifyIdentify compressions and rarefactions
DefineDefine a longitudinal wave

4. FROM THE SLINKY
VIDEO!
•What didyou notice about the
coils?
•Would you say the coils are
moving parallel or
perpendicular to the direction
in which the slinky is moving?

5. WHAT ARE
LONGITUDINAL
WAVES?
•Waves in which the
particles of the
medium move
parallel to the
direction of motion.

6. FEATURESOF
LONGITUDINAL
WAVES
•Compressions: regions in a
longitudinal wave where
the particles are closer
together.
•Rarefactions: regions in a
longitudinal wave where
the particles arefarapart.

7. PROPERTIES OF LONGITUDINAL WAVES
•Wavelength (λ): distance between two
successive/consecutive compressions or rarefactions.
•Units: meters(m)

8. AMPLITUDE
•Amplitude (A): is the maximum displacement
from equilibrium.
•ForLongitudinal Waves: it’s how far particles
move back and forth from their resting positions.

9. SIMULATION
(OPHYSICS)
•Use the
Ophysics
simulation to
adjust and
observe
amplitudeofa
longitudinal
wave.
A screenshot of a computer
A I -g enera ted content ma y be incorrect.

10. FREQUENCY
•Frequencyin a longitudinal wave is the
number of compressions or rarefactions
produced( that pass a point) per second.
•Units = Herts (Hz)

11. PERIOD
•Period (T) is the time it takes for one complete
wave cycle.
•In Longitudinal waves: It’s how long it takes one
particle of the medium to move forward and
backward from its rest position once during the
wave’s motion.
•Units = Seconds(s)

12. Question 1:
Which spring shows a longitudinal wave? Why?

13. Question 2 (Labelling)
DrawalongitudinalwaveandlabelCompressions,Rarefactions,
and Wavelength.

14. Next Lesson Preview
•Next lesson: Soundasan example of longitudinal wave and
calculations