ページ1:

Wifi
2. Microwave communication, radar, medical treatment, heating in oven
high frequency
short
wave length that directly point in narrow beams
- travel to ionosphere
- use
to send and recieve huge amount of info.
carry signal across distant avea
-higher antenna further signal transmitted
Produce heat for medical treatment (human can withstand) and use in microwave.
• Radar = common application.
La detect locate, track distant object
T
3. Infaved (IR) radiation
remote control, automotive night vision
- produced by thermal motion, vibration of atom and molecule
- receiver converts light pulse into electrical signals that instruct microcompressor to command
- used in Sensing
· Object on earth emit IR
4. Visible light (laser)
pcan be detected by electronic sensor
in form of Heat
Installed in thermographic.com.
energy
- produced by thermal motion, vibration of atom and molecule
· detectable to human eye.
- different wavelength, visible light can be refracted into colors at rainbow
- laser produce very narrow beam of monochromatic light
- drilling, cutting, alignment, reading barcode, record play compact disc.
5. Ultraviolet (UV) radiation tanning, back lightning, drying ink, coating
thermal motion, vibration of atom and molecule
↓ -
produced by
- used in counterfeit currency detector.
SUN
can cause sun burn, skin cancer, damage the
eye
UVA
UVB
UVC
travel to Earth's surface
pass through skin (Vit D)
7. Gamma-rays
-smallest wavelength
- produced by Supernova explosion
Absorbed by ozone layer -generated by nuclear fusion,
in stratosphere.
6-X-rays view object in detail, astronomy, medicine.
- Energetic, high penetrating power.
- in medicine → radiography.
+ are not deflected by
electric and magnetic field.
gamma
nuclear fission, lightning, decay.
- used in medicine (cancer
treatment, tumor in chest)
and food preservation
high penetrating power
most energy.

ページ2:

Wave tranfers
the medium.
Properties
Crest
Chergy
from one place to another with out trans ferring.
Parts of a Wave
Amplitude
.
•particles
ave displaced in
parallel perpendicular direction.
no. of crests shows maximum no.
of
positive I negative displacement of particles
Wavelength
―
(lambda)
• no. of wavelength = frequency (f)
Trough
Wavelength
shutterstock.com 2266402697
frequency
is measured in Hertz (Hz).
Period (T) of wave is time taken to complete 1 vibrational cycle.
measured in Second(s).
(frequency)
(speed)
(1)
T = 1
f =
1
f
T
m/s
℗ N = Sy
ti
9)
V = S
m/s
Σ = f ^
fλ
√ = fλ / λ
V
t
Hz
L. speed relating with wavelength & wave frequency.
High frequency waves have short wavelength.
Low-frequency waves have long wavelength
Mechanical Waves.
moving back
& forth around
↑ central point
- transfer energy through medium causing particles to oscillate
#1. longitudinal wave. Consigns)
-direction parallel
- Sound/ ultrasound
Com pression & rave fraction.
Rarefaction
Compression high pressure
4low
pressure
irection of travel
#2 transverse
-
wave (01720377)
direction perpendicular
Water, rope, electromagnetic.
Direction of
particle
=NA
vibration
Wavelength
.~crest.
Movement of air molecules
wavelength