Third Grading Module 2 Waves Around You

Module 2:
WAVES AROUND
YOUArchie A. Duran

Waves are all
around us…
Throwing a stone into
a lake
Strumming the strings
of a guitar
Switching on of a lamp

Water waves
Sound waves
Light waves

Importance of
Waves
Helps explain phenomena in
nature
Helps in designing
skyscrapers and bridges
Helps in improving
telecommunication and

What is a WAVE???
a wave is a periodic
disturbance that moves away
from the source and carries
energy
regular
movement

Activity 1: Let’s
make waves
Objective
In this activity, you will observe
and draw different types of
waves and describe how they
are produced. You will also
describe the different types of

Third Grading Module 2 Waves Around You

3 types of Waves
Transverse Waves
Longitudinal Waves
Surface Waves

transverse
perpendicular
longitudinal
circular

Crest
Trough
Amplitude
Wavelength

Crest
The highest points of a
wave.

Trough
Lowest points of a wave.

Amplitude
The maximum displacement
of a wave from the
equilibrium.

Wavelength
Distance from two
successive crest or trough.

Frequency
The number of waves that
pass a reference point for
one second.
Units: 1 cycle/second = 1
Hertz

Period
The time needed for one
complete wave to pass a
reference point.
Unit: seconds

Frequency-Period
Relationship
Frequency is the reciprocal
of period
Period is the reciprocal of
frequency𝐹𝑟𝑒𝑞𝑢𝑒𝑛𝑐𝑦 =
1
𝑝𝑒𝑟𝑖𝑜𝑑
𝑃𝑒𝑟𝑖𝑜𝑑 =
1
𝑓𝑟𝑒𝑞𝑢𝑒𝑛𝑐𝑦

A young girl is on a swing
that completes 20.0 cycles
in 25 seconds. What are its
frequency and period?

A clock clicks 88 times in 22
seconds. Calculate the
frequency and period of the
clock.

A spring vibrates 24, 000 times
in 1.00 minutes. What are the
frequency and period. [Hint:
frequency is cycles per second.]

Wave Speed
The distance travelled of a
wave per unit of time.
Distance = wavelength
Time = Period

or
𝑊𝑎𝑣𝑒 𝑆𝑝𝑒𝑒𝑑 =
𝑊𝑎𝑣𝑒𝑙𝑒𝑛𝑔𝑡ℎ
𝑃𝑒𝑟𝑖𝑜𝑑
𝑊𝑎𝑣𝑒 𝑆𝑝𝑒𝑒𝑑 = 𝑊𝑎𝑣𝑒𝑙𝑒𝑛𝑔𝑡ℎ 𝑥 𝐹𝑟𝑒𝑞𝑢𝑒𝑛𝑐𝑦

A vibrating source with a
frequency of 20.0 Hz
produces water waves that
have a wavelength of 3.0 cm.
Calculate the speed of the
waves.

A wave along a guitar
string has a frequency of
540 Hz and a wavelength
of 2.5 meters. Calculate
the speed of the wave.

Relationship
between
wavelength,
wave speed,
frequency, and
energy.

As wavelength increases,
wave speed ____________.
As wavelength decreases,
wave speed ____________.

As wavelength increases,
frequency __________.
As wavelength decrease,
frequency __________.

As frequency increases,
wave speed ____________.
As frequency decreases,
wave speed ____________.

Mechanical Waves
vs.
Electromagnetic
Waves

Mechanical Waves
Are waves the can only be
transmitted with the presence
of a medium.
Medium can be solids, liquids,
or gas

Electromagnetic
Waves
Are waves that can be
transmitted even without the
presence of a medium.
Ex. Radiowaves, x-ray,
microwave, UV waves,

1. What happens to
energy as wavelength
increases?

2. As wave speed
decreases,
wavelength
_______________.

3. What happens to
frequency as wave
speed increases?

4. As wavelength
decreases, wave
speed
________________.

5. As energy
increases, what
happens to wave
speed?

6-7. Give the 2
formula used in
computing wave
speed.

8-10. Give the 3
classification of waves
based on the motion
of wave from its
source.

11. Frequency is
said to be the
reciprocal of
_____________.

12. The highest
points of a wave
are known as
________________.

13. The distance
from crest to the
next crest is known
as ________________.

14-15. Give the 2
classification of
wave based on the
requirement for
medium.

Third Grading Module 2 Waves Around You

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