# AQA AS Physics Unit 1 Revision

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• Created by: S Satish
• Created on: 18-04-13 17:02

First 1300 words of the document:

f
emf
What
i
s speci
fi
c char
ge?
Thi
s
is
the
char
ge
of
a par
ti
cl
e di
vi
ded
by
it
s mass.
7 1
How manyn
e ut
ron sa
n de
lectr
onsd
oesa
ni
onw
i
th8p
r
otonsa
ndas
peci
fi
cc
har
geo
f
1.
2x1
0
C kg andan
egat
ive
19
char
ge
of
3.2
x 10 C have?
19 19
Number
of
el
ect
rons
= 8
+ (
3.2
x 10 /
1.
6 x
10 )
=
8 +
2 =
10
elect
rons
19 7 1 26
M
= 3.
2 x
10 /
1.
2 x
10 Ckg
= 2.
67
x 10
26 27 26 26 27
2.
67
x 10
­ (
1.67
x 10 x
8)
=1.
33
x 10 and
so
1.33
x 10 /
1.
67
x 10 =
7.96
or
8 neut
rons
What
i
s t
he
str
ong
nucl
ear
f
orce?
Thi
si
saf orcet
hat
overcomest
hee
lectr
ost
ati
cf
orceso
f r
epulsi
ona
n dh
o l
dsp
rot
onsa
ndn
e ut
ronst
oget
her
inan ucl
eus.
I
tsr
angei
sn omo
r et
han3t
o4f
emtome
tresw
h i
chi
sa bout
t
hed
iame t
er
o f
asmal
l
nucl
eusi
ncomp ar
isont
othei
n f
ini
te
r
angeo
f elect
rost
ati
cf
orces.
I
tisar epul
si
vef
orcea
t
dist
ancesc
loser
t
hana
b out
0.
5f
emtome
tresw
hichp
revent
sp
rotons
and
neutr
ons bei
ng pushed
toget
her.
What
i
s r
oact
ive
decay?
Thi
s
is
w hen
nat
ural
ly
occur
ri
ng
oact
ive
isot
opes
rel
ease
ati
on.
What
i
s al
pha
ati
on?
Thi
s
is
w hen
the
nucl
eus
emi
ts
an
alpha
par
ti
cl
e (
hel
ium
nucl
eus)
.
What
i
s bet
a r
ati
on?
Thi
si
swhenan
e ut
roni
nan
e ut
ronr
i
chn
ucl
eusc
hangesi
nt
oap
r
otoni
nthen
ucl
eusa
ndab
et
ap
ar
ti
cl
ea
nda
nt
ineut
ri
no
ar
e cr
eat
ed
and
emit
ted
inst
ant
ly.
What
i
s gamma
ati
on?
Thi
si
se
lectr
omagnet
icr
ione
mitt
edf
r
om anu
nst
ablen
ucleusf
ol
lowingab
et
ao
r al
phae
mi ssi
ona
ndi
tcanp
ass
t
hrough
thi
ck
met
al
plat
es.
G amma
ati
on has
no
mass or
char
ge and
is
emitt
ed
fr
om a
nucl
eus
w i
th
too
much
ener
gy.
How
w er
e neut
ri
nos
discover
ed?
Sci
enti
stsd
educedt
hats
o mee
n ergyi
nab
e t
ae
mi
ssionw
asc
ar
ri
eda
wayb
ymy
s ter
yp
arti
cl
esc
a l
ledn
eut
ri
nosa
nd
ant
ineut
ri
nosb
e causet
hee
n ergyo
f
betap
ar
ti
clesv
ar
iedu
pt
oama
xi
mum t
hat
dependedo
nt
hei
sot
opew
hent
hee
ner
gy
spect
rum of
bet
a par
ti
cl
e s
w as
fi
rst
measur
ed.
How
w er
e ant
ineut
ri
nos
det
ect
ed?
They
w er
e det
ect
ed
as
a r
esul
t
of
thei
r
int
eract
ion
w i
th
um
nucl
ei
in
a l
arge
tank
of
w at
er.
What
ar
e t
he
sour
ces
of
neut
ri
nos?
Nucl
ear
r
eact
ors
and
the
Sun.
What
ar
e el
ect
romagnet
ic
w aves?
Thesec
onsist
of
ane
lect
ri
ca
ndma
gnet
icw
avet
hat
t
ravel
t
ogether
at
ri
ght
angl
est
oe
acho
ther
andv
ibr
atei
nt hed
ir
ect
ion
t
heyt
ravel
i
na
n dt
heya
res
ai
dt
ob
ei
np
h asew
it
he
a cho
ther
. Theya
ree
mitt
eda
sp acket
sa
n de
achi
sref
err
e dt
oa
sa
phot
on.
How
are
elect
romagnet
ic
w aves
emi
t
ted?
Thesea
ree
mitt
edb
yac
h argedp
a r
ti
cl
ew
hent
heyl
oset
hei
r
ener
gyo
r
whenaf
ast
movi
nge
l
ect
roni
sst
opped,
sl
owed
down
or
changes
dir
ect
ion
or
wh en
an at
om
deexci
tes.

Here's a taster:

What
i
s t
he
elect
romagnet
ic
spect
rum?
o waves,
Mi
crowaves,
I
nfr
ared,
Vi
si
ble,
Ul
tr
avi
olet
,
X r
ays,
Gamma
R ays
What
i
s a
laser
power
?
A l
aserb
e am consi
stso
fp
h ot
onso
f
thes
amef
requencya
ndt
hep
ower
ist
hee
ner
gyp
er
secondt
ransf
err
edb
yt
he
phot

Here's a taster:

How
is
a TV
tube
an
accel
erat
or?
AT
Vt ubei
sana
c cel
erat
or
that
accel
erat
ese
lect
ronsi
natubet
hr
o ughav
ol
tageo
f5000Va
ndt
hee
l
ect
ronsa
ref
ocused
i
ntoab
eam thath
i t
st hei
nsi
deo
ft
heT
V scr
een.Ma
gnet
icf
iel
dsp
r oducedb
ye
lectr
omagnet
sd
efl
ect
theb
eam of
el
ect
rons
so
it
scans
the
scr
een t
o cr
eate
an i

Here's a taster:

Muon =
u
Muon Neut
ri
no
=V u
Posi
tr
on =e+
El
ectr
on ant
ineut
ri
n o
=Ve
bar
Ant
imu on
= u
+
Muon Ant
ineutri
no =
V u
bar
What
ar
e t
he
conser
vat
ion
rul
es?
Ther
e must
be
conser
vat
ion
of
char
ge,
l
ept
on
number
,
bar
yon
number
and
str
angeness
but
not
i
n t
he
w eak
int
eract

Here's a taster:

Unl
iked
isposabl
eb
a tt
eri
est
hesec
a nb
er
echar
geda
ndw
o n'
t
rund
owns
ot
heya
r
emo
r ee
nvi
ronment
all
yf
r
iendl
y.
Acar
bat
ter
yh
a sa1
2 V r
ech ar
geableb
att
eryt
hat
isd
esi
gnedt
os
u ppl
yav
eryl
ar
gec
urr
ent
tos
t
art
thee
ngi
ne.
Theb
att
ery
r
echarges
w hen
the
engine
is
runni

Here's a taster:

What
i
s a
var
iabl
e r
esi
stor
?
Thi
s
is
used
to
ust
cur
rent
and
vol
tage
as
necessar
y.
What
does
O hm'
s l
aw st
ate?
Thep
o t
ent
ial
di
ff
erencea
crossame
t
all
i
cc
onduct
or
isd
i
rect
lyp
r
opor
ti
onal
t
ot
hec
ur
rent
t
hroughi
tpr
ovi
dedt
hep
hysi
cal
condi
ti
ons
do not

Here's a taster:

At
her
mistor
at
const
ant
temperat
ureg
ivesas
trai
ght
l
inea
ndh
i
gher
t
het
emper
atur
et
hes
t
eeper
t
heg
r
ent
becauset
he
r
esi
stance
decr
eases wi
th
incr
easi
ng t
emp er
atur
e.
What
does
the
graph
of
a di
ode
look
li
ke?
Most
di
odes(
si
l
icon)
requi
reat
hreshol
dv
o l
tageo
f

Here's a taster:

I
t doesn'
t
rel
yo
nt hed
i r
ect
iono
f
thec
ur
rent
. Theh
eat
inge
f
fect
of
ana
l
ter
nat
ingc
ur
rent
onl
yd
ependso
nt
hec
ur
rent
's
magnit
ude not
di
rect