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Physics ALevel 2019 Section 5 Flashcards | StudBud
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Physics ALevel 2019 Section 5
Physics ALevel 2019 Section 5
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A physics test on chapter 5 knowledge.
Flashcards
77 cards
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Practice quiz
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Questions
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Answers
1
How would you convert from radians to degrees
x180/π
xπ/180
2
What is phase difference?
the sum of two superposing waves
the difference in speed of two waves
the amount by which one wave leads/lags behind another
3
What is the definition of the mole
N/Na
Na/N
NxNa
4
What can be concluded from the random motion of smoke particles in air
the air particles are much smaller
the particles are much smaller than air particles
5
Does increasing the amplitude of an oscillating mass SHM increase its time period?
no
yes
6
Which of these is not stated about the universe in the cosmological principle?
the universe is homogenous
the universe is infinite
the laws of physics are universal
the universe is isotropic
7
the maximum displacement of an object from its equilibrium position is?
its amplitude
its time period
its displacement
8
What best describes the effect of a small increase in temp to a solid
the bonds between molecules completely breakdown
the internal energy decreases but the potential increases
molecules vibrate with greater amplitude and frequency
9
black body is an idealised object that emits a characteristic distribution of _ dependant on _
temperature dependant on wavelength
wavelength dependant on temperature
frequency dependant on wavelength
10
does gravitational field strength follow the inverse square law?
yes
no
maybe
11
the distance of an object from its equilibrium position is?
its amplitude
its time period
its displacement
12
What causes resonance
when the driving f is higher than the natural f
when the natural f is higher than the driving f
when the driving f equals the natural f
13
what does the formula ωr allow you to find
the speed of an object towards the centre of its orbit
the speed of an object in the direction of its orbit
14
What causes galaxies to move more slowly than expected?
visible matter
dark matter
dark energy
15
when is a resultant force required to cause an object to begin circular motion?
sometimes
never
When Arnie is stuck in traffic
always
16
A line segment joining a planet and the sun sweeps out equal areas during equal amounts of time
kepler's 3rd
kepler's 2nd
kepler's 1st
17
What best defines the absolute temperature scale
a scale starting at 0k and increasing in increments of 1k
a scale relying on the melting/boiling point of water
18
What is the definition of latent heat of vaporisation of a substance
energy per kg to induce a change in state from solid to gas
energy per kg to change its state from liquid to gas
19
What does Stefan's law not show?
L∝4πr2
L∝r2
L∝T3
20
Which law refers to pV=constant
Charles' law
Pressure law
Boyle's law
21
Arc length=
angle in radians / radius
angle in radians x radius
22
Objects of different temperature emit different ___ according to Wien's law
peak velocity
peak wavelength
peak frequency
23
which is an incorrect assumption of the kinetic theory of gasses
collisions are perfectly elastic
EPE between molecules is negligible
the volume occupied by gas particles is large
Time between collisions is far greater than the time of
24
Which is a correct ideal gas equation?
pv=Nkt
Npv=Nkt
25
Which formula is used when finding the displacement of an oscillating mass from the equilibrium
x=Asin(2πft)
x=Acos(ωt)
26
What does Hubble's law not tell us?
The speed of recession of a galaxy is proportional to d
nearby galaxies are blue shifted
27
Which is an example of resonance?
a silent washing machine
cars driving over a bridge
28
What is the Chandrasekhar limit?
1.4x solar mass
1.3x solar mass
1.5x solar mass
29
what else
smoke particles bump into air causing them to move
air in large numbers hitting smoke cause its random movement
30
at which temperature does water have minimum internal energy
0k (absolute 0)
337k
237k
31
what defines SHM?
a∝x a is always away from equilibrium
a∝x a is always towards equilibrium
a=x a is always towards equilibrium
32
answer:The energy per unit mass needed to raise the temp of a substance by 1.The question is?
What is specific heat of vaporisation?
What is latent heat of fusion?
What is specific heat capacity?
33
What else
air mols are moving continuously making them move constantly
air particles are drawn to the smoke particles due to charge
34
which is the correct combination of the gas laws
p1T1/V1=p2T2/V2
p1V1/T1=p2V2/T2
35
Dark matter/energy makes up ___ of the universe
75%
85%
95%
36
what is an advantage of a geostationary satellite?
satellite dish's have to be readjusted
satellite dish's can be fixed in one position
37
which is not a type of spectrum?
line spectrum
metallic spectrum
continuous spectrum
absorption line spectrum
38
What is a useful application of resonance?
cooking food in a microwave
keeping bridges in place
car suspension
39
what is the force exerted per unit mass on a point within a gravitational field?
Newtons law of gravitation
gravitational field strength
40
Which best describes the motion of atoms in a solid at a temp well below its melting point
molecules are partly free to move and partly fixed
molecules vibrate around fixed positions
molecules are free to move in random directions
41
what happens if the core of a star is between 1.4 and 3 solar masses?
a neutron star is formed
a black hole is formed
42
Define latent heat of Fusion
Energy per mass to change a substance from solid to liquid
Energy per mass to change the temp of a substance
43
which refers to p/T=constant
Pressure law
Boyle's law
Charles' law
44
Stellar parallax is a technique using ___ to measure ___ between the Earth and near by stars
distant(fixed) stars, the time
distant(fixed) stars, the distance
the distance, distant(fixed) stars
45
a distance from a base length of 1 AU that subtends one arc second is known as a ___
AU
parsec
light year
46
An equation relating the microscopic properties of a gas molecule to gas itself
pV=1/3 Nm2
V=2mc2
3/2pV=1/2mc2
47
in which direction does an oscillating mass accelerate
towards the equilibrium position
away from the equilibrium position
48
How is a star formed?
electrostatic forces between clouds of dust cause fusion
gravity causes a dust cloud to clump then collapse
on X-factor
49
How does dampening affect amplitude?
no affect
increase
reduce
50
What can be said about the universe at t=0
infinitely hot/dense
infinitely cool/sparse
infinitely large
51
In which direction does centripetal force act?
the opposite direction to the motion
in the direction of motion
perpendicularly to motion
52
What is Newtons law of gravitation?
F=-GMm/r2
F=-GMm/r
F=-GM/r2
53
if you integrate velocity you get...
velocity
displacement
acceleration
54
what does the d in dsinΘ=nλ represent?
distance between adjacent slits
distance between emitter and screen
distance between adjacent fringes
55
what is max when the mass is at its equilibrium position?
potential energy
kinetic energy
thermal energy
sound energy
56
Hydrogen core burning is followed by?
hydrogen shell burning
helium shell burning
helium core burning
57
What is the EM wave that helps prove the big bang theory?
gamma ray
ultraviolet
microwave
58
which of these is an example of a free oscillation
guitar string after being plucked
car suspension after going over a bump
59
What is not evidence for the big bang?
cosmic background radiation in the form of x-rays
light from all near by galaxies is red shifted
more distant galaxies are more red shifted
60
what can you derive with F=GMm/r
2
, F=mv
2
/r and v=2πr/T
Kepler's second law
Kepler's third law
61
Is escape velocity on a planet equal for objects of all masses?
no
yes
62
what is true for a star in the main sequence?
radiation pressure is greater than gravitational attraction
radiation pressure is equal to gravitational attraction
radiation pressure is smaller than gravitational attraction
63
What is angular frequency? (ω)
2πT
2πf
64
How is angular frequency defined
2π/T
2π/f
65
what is not a characteristic of a white dwarf?
remnant of a low mass star
low luminosity
dense
fusion occurs
66
Why does the velocity of an object in orbit change?
its speed is constantly changing
its direction is constantly changing
the force acting on it is not changing
67
which of these is not evidence of the big bang
predicable temperature fluctuations
existence of primordial helium
the formation of black holes
68
What does the formula 3/2kT allow you to work out?
the potential energy of a single gas molecule
The potential energy of a gas
The kinetic energy of a single gas molecule
69
Which of the following best defines the phase of a mass in oscillation?
the difference in wavelength
the point reached by a mass within its full oscillation
the path difference
70
what is internal energy?
Kinetic energy+potential energy
temperature-KE
thermal energy
71
What is the time taken for one complete oscillation to occur?
Phase
Time period
Phase difference
72
1 AU is?
the avg distance between the Sun and the Earth
the radius of the solar system
the average diameter of the solar system
73
What star does a planetary nebula leave behind?
neutron star
main sequence star
white dwarf
74
In which scenario has the substance reached max potential energy
a gas at 20 degrees
a liquid at 2 degrees
a solid at 50 degrees
75
why is the high specific heat capacity of water be useful?
it can absorb large amounts of heat for a small temp rise
it absorbs small amount of heat causing a high temp rise
76
What is the definition of thermal equilibrium?
when there is a temp gradient between 2 objects
when 2 objects are balanced on a seesaw
when there is no net heat flow between 2 objects
77
what is causing the expansion of the universe to accelerate?
dark energy
dark matter
the big bang
