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1
Q

When someone bounces on a comet, why may h be greater than calculated?

A

a decreases with h

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2
Q

luminosity units

A

W

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3
Q

celcius to kelvin

A

plus 273

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4
Q

assumptions made when using luminosity equation

A

-star is a black body
-star is spherical
-surface temperature is constant
-No energy is absorbed between the star and earth

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5
Q

lines of travel for a ball in a rocket of
1-accelerating velocity
2-constant velocity

A

1-curve down
2-straight

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6
Q

how would you describe strength of a gravitational field

A

greater/smaller not stronger/weaker

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7
Q

intensity-wavelength graph

what does a peak at a smaller wavelength mean?
what do greater peaks mean?

A

greater temperature
greater energy

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8
Q

what does a classical physics intensity wavelength graph look like?

A

curve from infinity down

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9
Q

heisenberg uncertainty principle implication

A

precise momentum and position/lifetime and energy not known at the same instant

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10
Q

what happens if uncertainty in position is greater than the slit separation when an electron is fired through a double slit

A

electron passes through both slits

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11
Q

how do 3d glasses work?

A

let in 1 projectors light and locks the other

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12
Q

What type of light comes from lamps

A

unpolarised

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13
Q

if point Y is between 2 charges and its electrical potential is 0 then what charges do the points have

A

opposite

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14
Q

units of electric field

A

NC-1

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15
Q

why may the reading uncertainty of the metre stick be 0.2mm instead of 0.5mm

A

because it’s the uncertainty in measuring the exact distance

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16
Q

what may a large percentage uncertainty in smallest values of d mean?

A

a systematic uncertainty

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17
Q

what energy does a ball have at the top and bottom of a vertical circle

A

top: Ek + Ep

bottom: Ek= Ek+Ep of top

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18
Q

2 balls (1 in horizontal circle and one hanging down 90 degrees to middle of circle)

what does Fc equal?

A

mg

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19
Q

what direction is R for a car on a sloped track?

A

90 decrees to slop

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20
Q

what type of interference pattern do slights at right angles make?

A

4 way pattern with 2 parallel lines of dots at each side

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21
Q

What MUST you mention when asked why patterns are more or less spread out?

A

d is contant in dsinthera

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22
Q

how to describe the direction of a magnetic field going up

A

towards top of page

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23
Q

if a particle is travelling theough a magnetic field at a velocity less than as found in F=qvb where F equals electric force, what happens?

A

moves towards opposite charged plate

1-lower speeds make a lower magnetic field

2-therefore there is an unbalanced force down (OR magnetic force is less than electric force)

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24
Q

why may a diode be used in a circuit with an inductor

A

to precent damage due to large back emf

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25
which direction to parallel plates point
+ to neutral
26
Is electric field strength the same anywhere between plates?
yes (same d) as it is uniform
27
How do you get total electrical potential V
add
28
electrical potential units
V
29
Electrical potential energy due to a point charge formula
Ep=QV=Q1 x Q2/4 x pi x e0 x r In J where q1 is the charge in the field and q2 is the point charge causing the field
30
What happens as a charge is accelerated from 0V plate to +1000V plate?
electrostatic potential energy is transformed into Ek
31
What happens as soon as a circuit with an inductor is switch on
back emf=-Vs so other components are V=0
32
what happens to lights in a circuit connected to only resistors and not inductors which circuit is switched in
turn on straight away
33
What happens to R of resistor as f changes
nothing
34
For small particles how can you link uncertainty and their value
roughly the same
35
what happens if a particle is much smaller than the slit
particle behaviour (just like when it is much bigger)
36
37
What must a equal fir a mass resting object an SHM system to stay in contact with
less than 9.8 acting DOWNWARDS
38
In SHM what does Etotal equal?
m(vmax)^2
39
What if a particle isninly slightly bigger than the slit?
wave behaviour
40
what v do you use for F=mv^2/2 and v=2pir/T
v perpindicular
41
whatnis the pitch of the helix?
the distance the particle moves along the magnetic field lines in 1 complete turn of the spiral
42
if given value and uncertainty what do you use in heisenberg principle
uncertainty
43
What if the uncertainty in the position is less than the gap?
particle behaviour
44
what happens as particles get further from the sun?
Wk decreases because 1-they gain Ep and lose Ek and 2-work is done against the sun’s gravitatiol field
45
helical motion components
perpindicular->causes a central force on a charged particle parallel->moves particle forwards in that direction (unbalanced force)
46
how do you work out h in horizontal SHM
1/2mv^2=mgh Ek at bottom (horizontal v at bottom (max) used) and Ep at top used
47
what is 2npoints on a wave have a phase difference of pi radians
electric field vectors are opposite
48
phase change units
radians
49
why is measuring multiple fringes rather than better?
1-reduces uncertajnty in value of 🔺x 2-reduces significance of any uncertainty on the value for 🔺x or d
50
polarisers turning answer
brightness decreases to 90 then increases to 180
51
how do polarising sunglasses work?
act as an analyster by absorbing/blocking some of the glare
52
why is it more effective to use an inductor rather than an additional resistor, toe ensure max energy is delivered to patient?
1-resistor will dissipate energy 2inductor will store energy
53
why will 2 identical sodium lamps not produce interference?
because the releasenof photons from each lamp is random
54
can 2 loudspeakers connected to the same signal generate produce interference?
yes
55
does wavelength change in division of wavefront?
no
56
how can uncertainty in x be improved
measuring mroe fringes and dividing
57
brewster’s angle
at the angle, the reflected ray is perfectly polarised and the reflected and refracted rays are 90 degrees to each other so ip+r=90
58
what happens to angle of incidence and angle of refraction of brewster’s angle underwater
swapped
59
why does a greater r equal a greater torque
applying the force at a greater distance from the acis of rotation will generate a grwater torque on the flywheel as T=Fr
60
gravitational forces of 2 asteroid
skewed towards smaller mass repelling lines
61
why can an electron be considered a wave
wavkeength is comparable to atomic radius so suitabke for interference
62
femtometre
x10-15
63
what happens to w in SHM if shorter chord
same w
64
explain why a particular thickness of zinc oxide coating is non-reflecting for a particular wavelength
particular thickness will produce destructive interference of reflected rayd for specific wavelength
65
whatbhappens to light at brewsters angle
fully polarised anywhere else it is only partially polarised
66
67
why is AC supply used for a D D magnetic field
the direction of the electric force acting on proton must change
68
how to improve accuracy
-eg time over multiple swings -increase range -increase number of
69
The speed of the pod decreases state the effect on theta
decreases tension decreases and weight remains unchanged
70
What indicates a non-uniform acceleration?
a=xt curved v-t graph
71
is centripetal acceleration greater, equal or less when r is greater
greater grwater distance from axis of rotation (r)=rw^2 w is the same
72
when angular vocity increases, why may a stone fly off a wheel
centripetal force increases until friction is insufficient to hold the stone in place
73
why may a satellite at low altitude orbit lose energy at a greater rate than a similar satellite in a high-altitude orbit?
greater friction from atomosphere at low orbit
74
changed to helical motion at poles
smaller pitch smaller r
75
why does a particle have a curved path between parallel plates
electrons travel with constant horizontal velocity and travel with constant vertical acceleration
76
what is a picometre?
x10-12
77
what does a larger speing constant mean?
stiffer
78
when radius increases, why may a pea no longer have a circular path on a plate
Fc increases since distance from axis of rotation is greater friction is insufficient to provide required Fc

AH Physics (7 decks)

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