SAT Subject Test: Physics Formulas

Instructions:

• Answer 50 questions in 15 minutes.
• If you are not ready to take this test, you can study here.
• Match each statement with the correct term.
• Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. Mass defect explanation

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2. Formula for electric potential energy?
Eff= 1- Qc/Qh = 1- Tc/Th
1/f= 1/di + 1/do
PE= 1/2 C (?V)² = 1/2 Q²/C = 1/2 Q?V
M= -di/do (=-hi/ho)


3. Distance formula?
N?/ d= x/L (where x =distance between c and the anti-node - L =distance from screen to source - n=number anti-node - and d = distance between the slits)
Angle of incidence=Angle of reflection
Distance= velocity * time
PV/nT'= p'V'n'T' (p=pressure - V= VOLUME - T= temperature)


4. Centripetal force formula
6.6310 ?³4 Js
Positive - focus in front of the lens (=real image)
F=mv²/ r
G= 6.67 * 10?¹¹ Nm²/kg²


5. If speed is high - index of refraction is....
Positive - focus in front of the lens (=real image)
Minimal energy that needs to be imparted to an electron on metal surface in order to liberate it.
Low
Fingers= Magnetic Field - Thumb=Velocity - Palm of hand= Force. RH=Proton - LH= electron.


6. Conversion factor from atomic mass units to MeV?
931MeV=1amu
Angle of incidence=Angle of reflection
Beat frequency= |F1-F2|
Negative - focus behind the lens (= virtual image)


7. (Full/Final) Velocity formula
G= 6.67 * 10?¹¹ Nm²/kg²
Ebinding= ?m * c² (= (?m)c²)
E0= 8.85 * 10?¹² C²/(Nm²)
Vfinal= V0 +at


8. Faraday's law
EMFavg. induced= -?Fb/ ?t (= - change in mag flux/change in time)
1.6*10?¹? C
?=h/p (where p= MOMENTUM=m?v - and h is planck's constant)
P=mv (?p=m?v)


9. Magnetic force formula (for particle)?
Voltage=PE/q (remember Joules/Coulomb= volt)
Particles in motion can display wave characteristics - and behave as if they had wavelength (?= h/p)
Force magnetic= |q|vBsin? (=qVperpendicularB) (?= angle between v and B)
Distance= velocity * time


10. Heat of fusion/vaporization fromula
Eff= 1- Qc/Qh = 1- Tc/Th
Intensity a Amplitude/ d²
Fingers= Magnetic Field - Thumb=Velocity - Palm of hand= Force. RH=Proton - LH= electron.
Q=m*L (where L is the latent heat of fusion or vaporization)


11. (Full) Displacement formula
N= C/velocity.
S= 1/2at² + v0t+ d0 (intial distance is often ignored because we decide where we want to start)
Law of inertia. Object in motion stays in motion unless acted upon by an outside force.
(n-1/2)?/ d= x/L (where x =distance between c and the anti-node - L =distance from screen to source - n=number anti-node - and d = distance between the slits)


12. New/old gas formula?

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13. Lenz's law
Fnet=ma
Induced current will flow opposite direction of magnetic flux.
6.6310 ?³4 Js
F=ILBsin? (?= angle btw. L and B)


14. Conservation of momentum
EMFavg. induced= -?Fb/ ?t (= - change in mag flux/change in time)
The incident angle at which total internal reflection occurs (use ?r=90°)
Momentum is always conserved in the absence of an outside force
Induced current will flow opposite direction of magnetic flux.


15. Formula for energy of a photon?

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16. Energy of an emitted photon formula?
Momentum is always conserved in the absence of an outside force
Energy of emitted photon = E2-E1 (=Energy level higher- Energy level lower)
The incident angle at which total internal reflection occurs (use ?r=90°)
?IE= - W (work)


17. Relativistic formula for length
PE=mgh
Apparent weight = Fb- weight= (mfg) - (m0g) = (mass of displaced fluid gravity) - (initial mass of object while hanging in air gravity) = (DfVfg)- (DoVog)
Length stationary=Length moving/Y
E= kq/r² (= f/q)


18. Gravitational constant
E= V/d
PV/nT'= p'V'n'T' (p=pressure - V= VOLUME - T= temperature)
W=(Force parallel)(distance)= Pressure ? V (change in volume)= qvoltage
G= 6.67 * 10?¹¹ Nm²/kg²


19. Impulse formula
The incident angle at which total internal reflection occurs (use ?r=90°)
?p=f?t (where f is AVERAGE force and t is how long force is applied)
Length stationary=Length moving/Y
Product of each lens's magnification


20. Law of reflection
Angle of incidence=Angle of reflection
Proton--> Neutron + positron (+ electron-neutrino - v) (° +1 e is produced)
F= (9/5)C+ 32
F= n * vel/2L n= 1 - 2 - 3... (L= length of pipe) (?=2L/n)


21. Formula for resistance of an OBJECT
Low
Etotal= E rest + KE= mc² + (Y-1)mc²
R= ?L/A = (resistivity)(length of wire) / (cross sectional Area)
Apparent weight = Fb- weight= (mfg) - (m0g) = (mass of displaced fluid gravity) - (initial mass of object while hanging in air gravity) = (DfVfg)- (DoVog)


22. Power formula?
P=IV=I²R=V² /R = Fd/t= Force*velocity
Minimal energy that needs to be imparted to an electron on metal surface in order to liberate it.
A=v²/ r
The incident angle at which total internal reflection occurs (use ?r=90°)


23. Formula for how velocity changes in air? (probably don't have to know)
Positive - focus in front of the lens (=real image)
Shorter ? - less diffraction - bigger shadow.
V= 331 m/s + (.6 m/s°C)Temperature
Fnet=ma


24. Electric field between two plates formula?
?p=f?t (where f is AVERAGE force and t is how long force is applied)
E0= 8.85 * 10?¹² C²/(Nm²)
Law of inertia. Object in motion stays in motion unless acted upon by an outside force.
E= V/d


25. Buoyant force formula
N?/ d= x/L (where x =distance between c and the anti-node - L =distance from screen to source - n=number anti-node - and d = distance between the slits)
Fb= Bperp-to-areaAcos? (Measures density of magnetic field lines that cross through an area)
Fb= mass of displaced fluid * gravity
A= A0 e ^ [-?t] (= activity at time t=0 e ^ ( - decay constant * time)


26. Momentum formula?
?IE= - W (work)
P=mv (?p=m?v)
6.6310 ?³4 Js
E= V/d


27. Ideal gas law
PV=nRT (p= pressure - V= volume - n= number of moles - T= temperature in KELVIN - R= .0821)
Fb= mass of displaced fluid * gravity
Difference between mass of nucleus and sum of it's constituent nucleons (protons/neutrons ...WHY?) energy lost when atom created. (That energy lost is the same energy it takes to break a nucleus into separate protons and neutrons)
G= 6.67 * 10?¹¹ Nm²/kg²


28. deBrolglie wavelength formula

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29. What is the photoelectric effect?
W= - kq1q2 (1/r2 - 1/r1)
The release of electrons due to bombardment of an atom by photons (groups of quanta/bundles of matter)
Momentum is always conserved in the absence of an outside force
Negative - focus behind the lens (= virtual image)


30. Sign of focus for convex lens?
Induced current will flow opposite direction of magnetic flux.
V=IR
Atom + electron--> Neutron (the addition of an electron - °?1e - causes a proton to change into a neutron - i.e. PROTON TRANSFORMS)
Negative - focus behind the lens (= virtual image)


31. Capacitance formula? (there are two)
Longer ? - larger diffraction - smaller shadow.
C= Q/V = e0 *A/d
Low
(n-1/2)?/ d= x/L (where x =distance between c and the anti-node - L =distance from screen to source - n=number anti-node - and d = distance between the slits)


32. ß? decay?
?=h/p (where p= MOMENTUM=m?v - and h is planck's constant)
Neutron --> Proton + electron ( + electron-antineutrino - V with line over it) ( °?1e produced)
Vfinal²=V0²+ 2ad
V= 331 m/s + (.6 m/s°C)Temperature


33. Binding energy explanation
Force magnetic= |q|vBsin? (=qVperpendicularB) (?= angle between v and B)
E= kq/r² (= f/q)
Energy it takes to break a nucleus into separate protons and neutrons (same as energy lost to create atom.)
?IE= - W (work)


34. Magnetic force formula (for wire)?
F=mv²/ r
E= V/d
F= n * vel/2L n= 1 - 2 - 3... (L= length of pipe) (?=2L/n)
F=ILBsin? (?= angle btw. L and B)


35. Moment of Inertia (a.k.a. rotational mass)
Zero.
1/f= 1/di + 1/do
I=mr²
Negative - focus behind the lens (= virtual image)


36. Transformer formula

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37. Newton's third law
Induced current will flow opposite direction of magnetic flux.
For every action there is an equal and opposite reaction
P=mv (?p=m?v)
Energy of emitted photon = E2-E1 (=Energy level higher- Energy level lower)


38. Right-hand rule
Induced current will flow opposite direction of magnetic flux.
Vstationary obj.= [u+v] / [1 + uv/c²] (where u is velocity of large object - and v is velocity of "thrown" object relative to large object)
Shorter ? - less diffraction - bigger shadow.
Fingers= Magnetic Field - Thumb=Velocity - Palm of hand= Force. RH=Proton - LH= electron.


39. Apparent weight (weight of submerged object)
Apparent weight = Fb- weight= (mfg) - (m0g) = (mass of displaced fluid gravity) - (initial mass of object while hanging in air gravity) = (DfVfg)- (DoVog)
A=v²/ r
F=mv²/ r
?=h/p (where p= MOMENTUM=m?v - and h is planck's constant)


40. Beat frequency
R= ?L/A = (resistivity)(length of wire) / (cross sectional Area)
The release of electrons due to bombardment of an atom by photons (groups of quanta/bundles of matter)
For every action there is an equal and opposite reaction
Beat frequency= |F1-F2|


41. Graviational force formula
E= kq/r² (= f/q)
?V2/?V1= N2/N1 (if secondary greater than primary it's a step-up transformer).
F=GM1M2/r²
N?/ d= x/L (where x =distance between c and the anti-node - L =distance from screen to source - n=number anti-node - and d = distance between the slits)


42. Formula for diffraction pattern - Anti-node to node (A-N)
Minimum frequency that needs to illuminate a metal surface for photoELECTRONS to be emitted
Difference between mass of nucleus and sum of it's constituent nucleons (protons/neutrons ...WHY?) energy lost when atom created. (That energy lost is the same energy it takes to break a nucleus into separate protons and neutrons)
(n-1/2)?/ d= x/L (where x =distance between c and the anti-node - L =distance from screen to source - n=number anti-node - and d = distance between the slits)
E= V/d


43. Torque formula
?V2/?V1= N2/N1 (if secondary greater than primary it's a step-up transformer).
Apparent weight = Fb- weight= (mfg) - (m0g) = (mass of displaced fluid gravity) - (initial mass of object while hanging in air gravity) = (DfVfg)- (DoVog)
The volume of the object.
Torque=force perpendicular to radius r = fr Toruqe=Ia = inertia * angular acceleration


44. Formula for magnetic flux?
Fb= Bperp-to-areaAcos? (Measures density of magnetic field lines that cross through an area)
Proton--> Neutron + positron (+ electron-neutrino - v) (° +1 e is produced)
Ebinding= ?m * c² (= (?m)c²)
6.6310 ?³4 Js


45. Threshold frequency formula?

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46. Kinetic Energy formula
Atom + electron--> Neutron (the addition of an electron - °?1e - causes a proton to change into a neutron - i.e. PROTON TRANSFORMS)
KE=1/2mv²
Negative - focus behind the lens (= virtual image)
?= 4L + 1.6d


47. Efficiency of an engine formula
KE= (Y-1)mc² (= (Y-1)E)
F=mv²/ r
W=qVoltage. (think C* J/C and C's cancel out)
Eff= 1- Qc/Qh = 1- Tc/Th


48. Law of refraction
Ni sin?i=nrsin?r
For every action there is an equal and opposite reaction
N?/ d= x/L (where x =distance between c and the anti-node - L =distance from screen to source - n=number anti-node - and d = distance between the slits)
K= 9 * 10? Nm²/C²


49. What is the apparent weight of a floating object?
?IE= - W (work)
Zero.
C= 3*108 m/s
PV/nT'= p'V'n'T' (p=pressure - V= VOLUME - T= temperature)


50. If you drop an object into water the volume displaced equals...
Vfinal²=V0²+ 2ad
Fb= mass of displaced fluid * gravity
The volume of the object.
N= C/velocity.