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7/23/2019 Jayvee dime,,,,Project in Physics light and Sound.pptx
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GOOD
MORNING
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7/23/2019 Jayvee dime,,,,Project in Physics light and Sound.pptx
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LIGHT
AND
SOUNDS
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Light and Sound
Objectives:
1) Know the Properties of light
2) Difference of Reflection from Refraction
3) Know more about Colours
4) Different Properties of sound
5) ll abou !earing
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Properties of Light
Light travels in straight lines:
Laser
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Light travels VERY FAST around
300,000 kilometres er se!ond"
At this speed it cango around the world 8times in one second.
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7/23/2019 Jayvee dime,,,,Project in Physics light and Sound.pptx
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Light travels mu!h #aster than sound" For
e$amle:%& Thunder and lightning
start at the same time,
'ut (e (ill see the
lightning #irst"
2) )hen a starting istol
is #ired (e see the
smoke #irst and then
hear the 'ang"
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7/23/2019 Jayvee dime,,,,Project in Physics light and Sound.pptx
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)e see things 'e!ause the*
re#le!t light into our e*es:
Assignment
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7/23/2019 Jayvee dime,,,,Project in Physics light and Sound.pptx
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Luminous and non-luminousobjects
A luminous o'+e!t is one that rodu!es light"
A nonluminous o'+e!t is one that re#le!ts light"
Luminous objects Reflectors
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7/23/2019 Jayvee dime,,,,Project in Physics light and Sound.pptx
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Shados
Shado(s are la!es (here light is-'lo!ked.:
Ra"s oflight
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7/23/2019 Jayvee dime,,,,Project in Physics light and Sound.pptx
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!RO!"RTI"S O# LIGHTSUMMAR$
1) Light travels in straight lines
2) Light travels much faster than sound
3) We see things because they reflect light
into our eyes
4) Shadows are formed when light is bloced
by an object
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7/23/2019 Jayvee dime,,,,Project in Physics light and Sound.pptx
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Re%ectionRe#le!tion #rom a mirror:
Incident ray
Normal
Reflected ray
Angle of incidence Angle of
reflection
/irror
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7/23/2019 Jayvee dime,,,,Project in Physics light and Sound.pptx
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The La o& Re%ection
!ngle of incidence " !ngle of reflection
n other (ords, light gets re#le!ted #rom a sur#a!e
at 1111 11111 angle it hits it"
The
same 222
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7/23/2019 Jayvee dime,,,,Project in Physics light and Sound.pptx
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Using mi''o's
T(o e$amles:
%& A eris!oe
& A !ar headlight
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7/23/2019 Jayvee dime,,,,Project in Physics light and Sound.pptx
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Color)hite light is not a single !olour4 it is made
u o# a mi$ture o# the seven !olours o# the
rain'o("
)e !an demonstrate this '*slitting (hite light (ith a
rism:
#his is how rainbows areformed$ sunlight is %s&lit u&' byraindro&s(
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7/23/2019 Jayvee dime,,,,Project in Physics light and Sound.pptx
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The colours of the rainbo:
Red
5range
Yello(
6reen
7lue
ndigo
Violet
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7/23/2019 Jayvee dime,,,,Project in Physics light and Sound.pptx
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Adding colou's)hite light !an 'e slit u to make searate !olours" These
!olours !an 'e added together again"
The rimar* !olours o# light are red, 'lue and green:
!dding blue and red
maes magenta
&ur&le)
!dding blue and green
maes cyan light blue)
!dding all three
maes white
again
!dding red and
green maes
yellow
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7/23/2019 Jayvee dime,,,,Project in Physics light and Sound.pptx
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Red
!agenta
"hite
#ello
$lue %reen
&yan
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7/23/2019 Jayvee dime,,,,Project in Physics light and Sound.pptx
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Re&'action
Re#ra!tion is (hen (aves 1111 11 or slo( do(n due to travelling
in a di##erent 111111111" A medium is something that (aves (ill
travel through" )hen a en is la!ed in (ater it looks like this:
n this !ase the light ra*s are slo(ed do(n '* the (ater and are
11111, !ausing the en to look odd" The t(o mediums in this
e$amle are 111111 and 1111111"
Words * s&eed u&+ water+ air+ bent
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7/23/2019 Jayvee dime,,,,Project in Physics light and Sound.pptx
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Sound ( The basics
)e hear things (hen the* vi'rate"
# something vi'rates (ith a high #re8uen!* 9vi'rates ver* 111111&
(e sa* it has a 11111 it!h"
# something vi'rates (ith a lo( #re8uen!* 9vi'rates 111111& (e sa*
it has a 1111 it!h"
The lo(est #re8uen!* !ould hear (as
Words * slowly+ low+ high+ ,uicly
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D'aing sounds)
This sound (ave has
a 11111 #re8uen!*:
This sound (ave has a
111 1#re8uen!*:
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Drawing sounds
This sound wave has a_____ amplitude(loud):
This sound wave has a_____ amplitude(quiet):
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Hea'ing *'oblems
5ur hearing range !an 'e damaged '* several things:
%& Too mu!h ear (a$2
& ;amage to the auditor* nerve
3& llness or in#e!tions
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Othe' sound e+ects)
Like light, sound !an 'e
%& Re#le!ted sound re#le!tions are !alled 111111"
& Re#ra!ted this is (h* *ou might sound strange i#
*ou tr* talking under(ater
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Than, $ou
=resented 7*:
>a*vee A" ;ime