jayvee dime,,,,project in physics light and sound.pptx

7/23/2019 Jayvee dime,,,,Project in Physics light and Sound.pptx

1/25

GOOD

MORNING


2/25

LIGHT

AND

SOUNDS


3/25

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


4/25

Properties of Light

Light travels in straight lines:

Laser


5/25

Light travels VERY FAST around

300,000 kilometres er se!ond"

At this speed it cango around the world 8times in one second.


6/25

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"


7/25

)e see things 'e!ause the*

re#le!t light into our e*es:

Assignment


8/25

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


9/25

Shados

Shado(s are la!es (here light is-'lo!ked.:

Ra"s oflight


10/25

!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


11/25

Re%ectionRe#le!tion #rom a mirror:

Incident ray

Normal

Reflected ray

Angle of incidence Angle of

reflection

/irror


12/25

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


13/25

Using mi''o's

T(o e$amles:

%& A eris!oe

& A !ar headlight


14/25

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(


15/25

The colours of the rainbo:

Red

5range

Yello(

6reen

7lue

ndigo

Violet


16/25

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


17/25

Red

!agenta

"hite

#ello

$lue %reen

&yan


18/25

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


19/25


20/25

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


21/25

D'aing sounds)

This sound (ave has

a 11111 #re8uen!*:

This sound (ave has a

111 1#re8uen!*:


22/25

Drawing sounds

This sound wave has a_____ amplitude(loud):

This sound wave has a_____ amplitude(quiet):


23/25

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


24/25

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


25/25

Than, $ou

=resented 7*:

>a*vee A" ;ime

jayvee dime,,,,project in physics light and sound.pptx

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