Science 10 - Electromagnetic Waves

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2. WELCOME TO
QUARTER 2: WEEK 1
Prepared by: Mrs. Anilyn A. Dizon
(Science Teacher)

3. Objectives:
At the end of the lesson, you will be able
to:
1. Discuss how electromagnetic waves are formed.
2. Differentiate mechanical waves with electromagnetic
waves.
3. Compare the relative frequencies of different forms
of electromagnetic waves
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4. a v w e
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It is a disturbance in
space.
wave

5. S e c r t
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It is the highest point in a wave.
crest

6. t g h u r o
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It is the lowest point in a
wave.
trough

7. l m u p t d e a i
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It is the distance from the midpoint to
the highest (or lowest) point of a wave.
amplitude

8. e n e v t g w l a h
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It is the distance between two successive identical
parts of a wave.
wavelength

9. n e q f c e u
r y
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It refers to the number of waves
produced in one second.
frequency

10. a r g n e
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It refers to the extent or the limits between
which variation is possible.
range

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12. To know the lesson for today, let me ask you a few
questions:
✘ What is your favorite color?
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✘ Do you use remote control on
your TV?
✘ Have you felt the warmth of the
sun on your skin?

13. To know the lesson for today, let me ask you a few
questions:
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✘ Did you send text messages to somebody
today?
✘ Or have you ever tried cooking in a
microwave oven?

14. Electromagnetic
Waves
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15. View a short video presentation on the Characteristics of
Electromagnetic Waves
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https://www.youtube.com/watch?v=pj_ya0e20vE&t=26s

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17.  are waves that are
created as a result of
vibrations between an
electric field and a
magnetic field
What are Electromagnetic Waves?
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 These waves are a
combination of electric and
magnetic fields.
 A changing magnetic field
produces an electric field
and a changing electric field
produces a magnetic field.

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Both the electric field and the
magnetic field oscillate
perpendicular to each other and
to the direction of the propagating
wave.

20. Properties of EM waves
1. All EM waves are transversewave
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21. .
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Properties of EM waves
 They all travel at the speed of light
in vacuum
c = 300, 000,000 m/s or 3 x 108 m/s
They can all be emitted and
absorbed by matter

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Ø number of cycles a
wave completes in one
second; expressed in
Hertz
FREQUENCY
WAVELENGTH
Ø the distance measured
from one crest of a
wave to the next crest

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Activity 1

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Q1. Which electromagnetic wave has the longest
wavelength?
Q2. Which electromagnetic wave has the shortest
wavelength?
Q3. Observe what happens to the wavelength of the
electromagnetic waves as they progress (goes
rightward from the figure). Does the wavelength of the
EM waves increase or decrease as we go from radio
wave to gamma ray?

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Directions: Read each item carefully. Write only the letter of your choice.
1. This type of wave was discovered by famous astronomer Sir Frederick William
Herschel and has a range of 7x10-7 m – 1x10-5 m.
a. infrared
b. microwave
c. radio wave
d. visible light
2. Which of the following electromagnetic waves has the least wavelength range?
a. infrared (7x10-7 m – 1x10-3 m)
b. x-ray (1 x10-11 m – 1 x10-8 m)
c. visible light (6.22 x10-7 m – 4.55 x10-7 m)
d. ultraviolet (1x10-8 m – 4x10-7 m)
3. Which among the following EM waves has the longest wavelength?
a. infrared
b. ultraviolet
c. visible light
d. x-ray

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4. Which electromagnetic wave can travel the farthest
distances because it has a wavelength range of greater
than 1x10-1 m?
a. gamma ray
b. microwave
c. radio wave
d. x-ray
5. The wavelength of microwaves ranges from 1x10-1 m to
1x10-3 m. Which of the following has size comparable to
the wavelength of microwave?
a. Bacteria
b. Coin
c. Human
d. Pin

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ASSIGNMENT: Make a concept web of
the contributions of the following
scientists. Include pictures of the
scientist. (short bondpaper)
A. Ampere
B. Faraday
C. Hertz
D. Maxwell
E. Oersted

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😉

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