Summary Doc Scientia Physical Sciences. Chemistry, ISBN: 9781920537159 Physical Sciences
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,Con ersins :
engths :m .
Ime :S •
Mount of substance : mole
ectric current A
:
ampere
- •
-
emprature :C Degree cekuis .
ass :
kg kilogram
kilo :/ 03
106 1.1Mt 1.1×106 J
mega
:
e.g
-_
b
be
-
10
-
nano :
µc=x✗lo
e.g
/ mm
=
1×10 -3m
I NM =
1×10 -6m
lnm= 1×10 -9m
1×10 -12m
1pm =
, UNIT .
1 TRANSVERSE PULSES :
Transverse pulse :
Pulses :
Pulse which displacement ot
Single disturbance that is
C
propagated by a medium .
•
the of the medium
-
d
particles .
Hose a
.
• *
is perpendicular to direction b
d- movement ot pulse .
A
pulse is
produced in the hose the medium)
When
moving along
A- mmpkie-u.dd.ee Maximum : no
pulse is the hose : At position of rest .
disturbance of a particle a :
Amplitude Measure of # of
energy
the pulse has)
Pulse
from its
position of b
length
:
rest .
Puutsseekenr.gg#hh:Diseancebewc: Direction of movement of pulse
start and end of pulse .
D: Direction of movement the medium
Pulse has no
frequency
it happens V =D ÷ t fi
only
as once .
Burke sspeeedd Two dittrent of movements
types
: Distance f
covered pulse Movement of
by of the particles
-
in a sec .
movement .
V= Pulse speed -
Movement of the
pulse .
D= distance covered ( m) These movements are perpendicular to each other .
t=
change in time ( s)
ssuuppeerrpoossittioonn Interference
Algebraic
: :
sum
Ot the The Ot the
overlapping
two
pulses that two pulses that are at the same point at same time .
The forces overlap and
occupy
the the
they
:
same
space at
1) each
same time .
Strength other
Constructive interference : 2) Cancel each other
crest Otto 3) Weaken each other smaller
causing amplitude
sakes meet each
After
overlapping they
other on the same side of rest
position . maintain their previous amplitudes .
Destructive interference :
crest of one pulse and through
Destructive interference :
d- another meet each other on the Two pulses meet on opposite side of rest position .
same side of rest
position .
Result : A pulse with smaller amplitude .
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