2. You should be able to:
1. Relate the characteristics of waves.
S7LT-IIId-6
1.1 Determine the relationship among
wave speed, wavelength, and frequency.
3. Just a Reminder(Setting up Rules):
Be with your assigned buddy and stay in your
area.
Wear facemask, this is a must.
One of you will be the leader, your partner will
be the secretary. Just choose who will be the
presenter.
Read and follow procedures properly. Refer to
your teachers if clarification is needed.
4. Just a Reminder(Setting up Rules):
Work collaboratively. Respect each other’s
opinion/insights.
Maintain orderliness while working. Observe
proper posture and sit properly. Focus on task
and use time wisely.
Get the task card from your teacher.
Happy learning!
5. Pair Activity
Work in pair. You are provided with materials and
you are tasked to do an activity.
Each member is expected to contribute his/her
ideas for the activity based on the situations
given.
Answer the questions and contribute your
answer/s for reporting
Peer Feedback is allowed to promote fair and
honest learning environment.
6. M C H N C L
L C T R M G N T C
Let us review our previous lesson. Complete the
missing letters with the vowels A E I O U.
7.
8. Today we are going to Relate the
characteristics of waves by
determining the relationship
among wave speed, wavelength,
and frequency.
9. Anatomy of a Wave
Objective: Identify the quantities used in describing periodic waves.
Material: Activity Sheet, Ruler
Procedure:
A.How do we measure the wavelength of a wave?
1.The wavelength of a wave refers to the distance between
any successive identical parts of the wave. For instance,
the distance from one crest to the next is equal to one full
wavelength. In the illustration below, this is given by the
interval B to F. Identify the other intervals that represent
one full wavelength.
Activity 1
10. A.How do we measure the wavelength of a wave?
1.The wavelength of a wave refers to the distance between
any successive identical parts of the wave.
11.
12. Formative Test 1
1.What do you call the highest point of the
wave?
A. wavelength B. trough
C. crest D. frequency
2.What is the lowest point of the wave?
A. wavelength B. trough
C. crest D. frequency
13. 3. What is wavelength? ?
a. Number of waves that pass a particular point
every one second.
b. distance between any successive parts of the
wave.
c. distance travelled by wave per second
d. time required for one complete wave to pass
a given point.
4. What is its unit of measurement?
a. Hz b. m c. s d. m/s
14. B. How do you measure the frequency of a wave?
The frequency of a series of periodic
waves is the number of waves that pass
a particular point every one second.
Period - Time required for one complete
wave to pass a given point.
15. Number of waves
(N cycles) that passed by
the ribbon in 10 seconds
Frequency of the wave (N
cycles/10 seconds)
Period of the waves
(seconds)
Table 1. Frequency and period of the wave
Frequency = 1/period
16.
17. Formative 2
1. What is frequency?
a. Number of waves that pass a
particular point every one second.
b. Distance between any successive
parts of the wave.
c. Distance travelled by wave per second
18. 2. What is period?
a. Number of waves that pass a particular point
every one second.
b. Distance between any successive parts of the
wave.
c. Distance travelled by wave per second
d. Time required for one complete wave to pass a
given point.
19. 3. What is the unit of
measurement of frequency?
A. Hz B. m
C. s D. m/s
20. C. How do you measure the
speed of the wave?
1.The wave speed is the distance
travelled by the wave per second.
Wave speed = distance travelled per second
=frequency x wavelength
21. Estimated
wavelength
(meters)
Number of waves
(N cycles) that
passed by the
ribbon in 10
seconds
Frequency of the
waves (N cycles/10
seconds)
Wave speed
(meter/second)
1.Use the data from the 2 activities, calculate the wave
speed of the observed periodic waves. Record the results
in a table similar to table 2.
22. Formative 3
1. What is the relationship between wave
speed, wavelength and frequency?
a. If speed is constant, frequency is inversely
proportional to the wavelength.
b. If speed is constant, frequency is
proportional to the wavelength.
c. If speed is constant, frequency is the same
to the wavelength.
23. Formative 3
2. Suppose you observed an anchored boat to
rise and fall once every 4.0 seconds as waves
whose crests are 25 meters apart pass by it.
a. What is the frequency of the observed
waves?
b. What is the speed of the waves?
24.
25. What is the relationship among
wave speed, wavelength, and
frequency?
26. •1. Waves in a lake are 5.00 m in length
and pass an anchored boat 1.25 sec
apart. The speed of the wave is
•2. A wave with a speed of 10 m/s has a
2-m wavelength. Solve its frequency.
27. MULTIPLE CHOICE: Determine the relationship between
wave speed, frequency and wavelength. Select only the
letter that best describe the statement.
1.The wave speed of all electromagnetic waves is the
same which is equal to the speed of light.
Determine the relationship among wavelength,
and frequency?
A.The higher the frequency, the shorter the wavelength.
B.The higher the frequency the higher the wavelength
C.The lower the frequency the shorter the wavelength.
D.The lower the frequency no effect on the wavelength.
28. 2. Which statement best describes the
illustration?
A. Long wavelength, low frequency.
B. Long wavelength, high frequency.
C. Low frequency, short wavelength.
D. High frequency, short wavelength.
29. A. Long wavelength, low frequency
B. Long wavelength, high frequency
C. Low frequency, short wavelength
D. High frequency, short wavelength
3. Which statement best describes the illustration?
30. Below is a snapshot of waver water passing by. Determine the
relationship between wave speed, frequency and wavelength
4. If the waves are going by at the same speed,
which wave has the greatest frequency of
vibration?
A.I B. II C. III D. IV
31. Below is a snapshot of waver water passing by. Determine the
relationship between wave speed, frequency and wavelength
5. If the waves are going by the same frequency,
which wave has the longest wavelength?
A.I B. II C. III D. IV
What is this type of wave that uses medium to transfer energy. Examples sound wave, earthquake, string of guitar
What is this another type of wave that does not need a medium to transfer energy? Radiowave, microwave, infrared
Let us guess the different characteristics of wave based on the illustration. Crest, highest point, trough lowest point and wavelength distance between two successive point, amplitude, height of the wave and describes the energy carried by the wave.
For instance, the distance from one crest to the next is equal to one full wavelength. In the illustration below, this is given by the interval B to F. Identify the other intervals that represent one full wavelength. A to E. C to G
1 C, 2. B.
3. B 4. B
Ex. 15 cycles , 15 cycles/10s =1.5 Hz, 1/1.5Hz = 0.67s From the identified frequency of the observed periodic waves, the period can calculated. For example, if two waves per second is passing by, each has a period of 1/2 seconds.
IF you increase the frequency of vibration by jerking the end of the rope at a faster rate, what happens to the wavelength? The wavelength become shorter.
A. Speed is constant = frequency is inversely proportional to the wavelength.
a. Frequency = 1/period = 1 / 4.0 s = 0.25 Hz
b. 0.25 Hz x 25 m = 6.3 m/s
Phillipines is a typhoon prone country. Valladolid is a coastal municipality. During wet months, how would you describe the situation of our coastal areas especially when there is typhoon coming? What about the waves?
How would you prepare when there is storm surge warning in your area? We learn to adapt to what the ocean/seas provide.
