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. Potential Energy formula
PE=mgh
Felec=qE=[kq1q2]/r²
?= 4L + 1.6d
?V2/?V1= N2/N1 (if secondary greater than primary it's a step-up transformer).


2. Formula for electric potential energy?
E0= 8.85 * 10?¹² C²/(Nm²)
A=v²/ r
PE= 1/2 C (?V)² = 1/2 Q²/C = 1/2 Q?V
Negative - focus behind the lens (= virtual image)


3. ß? decay?
En= [Z²/n² * -13.6ev ] (Z is number of protons in atom's nucleus - n is energy level number)
Neutron --> Proton + electron ( + electron-antineutrino - V with line over it) ( °?1e produced)
Minimum frequency that needs to illuminate a metal surface for photoELECTRONS to be emitted
Momentum is always conserved in the absence of an outside force


4. Centripetal force formula
KE=1/2mv²
Angle of incidence=Angle of reflection
P=IV=I²R=V² /R = Fd/t= Force*velocity
F=mv²/ r


5. Impulse formula
F= (9/5)C+ 32
?p=f?t (where f is AVERAGE force and t is how long force is applied)
Y= 1/ v(1-(v/c)²)
V=IR


6. Law of reflection
Particles in motion can display wave characteristics - and behave as if they had wavelength (?= h/p)
?= 4L + 1.6d
V= 331 m/s + (.6 m/s°C)Temperature
Angle of incidence=Angle of reflection


7. Sign of focus for convex lens?
KE=1/2mv²
N= C/velocity.
EMFavg. induced= -?Fb/ ?t (= - change in mag flux/change in time)
Negative - focus behind the lens (= virtual image)


8. Gravitational constant
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)
F=mv²/ r
G= 6.67 * 10?¹¹ Nm²/kg²
Distance= velocity * time


9. Momentum formula?
The release of electrons due to bombardment of an atom by photons (groups of quanta/bundles of matter)
F= (9/5)C+ 32
Distance= velocity * time
P=mv (?p=m?v)


10. Mass defect explanation

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11. What is the photoelectric effect?
W=(Force parallel)(distance)= Pressure ? V (change in volume)= qvoltage
E= kq/r² (= f/q)
Fb= Bperp-to-areaAcos? (Measures density of magnetic field lines that cross through an area)
The release of electrons due to bombardment of an atom by photons (groups of quanta/bundles of matter)


12. Binding energy formula
Ebinding= ?m * c² (= (?m)c²)
Intensity a Amplitude/ d²
Y= 1/ v(1-(v/c)²)
F=ILBsin? (?= angle btw. L and B)


13. Electric field between two plates formula?
A= A0 e ^ [-?t] (= activity at time t=0 e ^ ( - decay constant * time)
M= -di/do (=-hi/ho)
N= C/velocity.
E= V/d


14. Planck's constant in electronvolts* seconds?
EMFavg. induced= -?Fb/ ?t (= - change in mag flux/change in time)
Neutron --> Proton + electron ( + electron-antineutrino - V with line over it) ( °?1e produced)
4.14 10?¹5 eVs
?Tstationary= Y (?Tmoving)


15. Thin lens equation
Low
The volume of the object.
1/f= 1/di + 1/do
Felec=qE=[kq1q2]/r²


16. Low frequency waves have...
Intensity a Amplitude/ d²
Energy of emitted photon = E2-E1 (=Energy level higher- Energy level lower)
?IE= - W (work)
Longer ? - larger diffraction - smaller shadow.


17. Heat formula
931MeV=1amu
R= ?L/A = (resistivity)(length of wire) / (cross sectional Area)
W= - kq1q2 (1/r2 - 1/r1)
Q=mc?T (where T is temperature)


18. Elastic potential energy for a spring formula
PEspring= 1/2 kx² (K is spring constant - X is distance spring compressed)
V= 331 m/s + (.6 m/s°C)Temperature
F=GM1M2/r²
Atom + electron--> Neutron (the addition of an electron - °?1e - causes a proton to change into a neutron - i.e. PROTON TRANSFORMS)


19. Activity of a radioactive sample formula? (probably don't have to know)
Apparent weight = Fb- weight= (mfg) - (m0g) = (mass of displaced fluid gravity) - (initial mass of object while hanging in air gravity) = (DfVfg)- (DoVog)
931MeV=1amu
A= A0 e ^ [-?t] (= activity at time t=0 e ^ ( - decay constant * time)
Large/high


20. Formula for diffraction pattern - Anti-node to node (A-N)
(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)
Torque=force perpendicular to radius r = fr Toruqe=Ia = inertia * angular acceleration
The volume of the object.
Etotal= E rest + KE= mc² + (Y-1)mc²


21. K constant for electric field formula?
K= 9 * 10? Nm²/C²
Felec=qE=[kq1q2]/r²
W= - kq1q2 (1/r2 - 1/r1)
C= 3*108 m/s


22. If speed is slow/low - index of refraction is...
S= 1/2at² + v0t+ d0 (intial distance is often ignored because we decide where we want to start)
931MeV=1amu
Large/high
N= C/velocity.


23. Threshold frequency explanation?
Ni sin?i=nrsin?r
?=h/p (where p= MOMENTUM=m?v - and h is planck's constant)
Minimum frequency that needs to illuminate a metal surface for photoELECTRONS to be emitted
E0= 8.85 * 10?¹² C²/(Nm²)


24. Beat frequency
Force magnetic= |q|vBsin? (=qVperpendicularB) (?= angle between v and B)
Beat frequency= |F1-F2|
Energy of emitted photon = E2-E1 (=Energy level higher- Energy level lower)
F=GM1M2/r²


25. Work (only in terms of charge and voltage) formula

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26. Work formula
Q= [(mass of A + mass of B) - (mass of C + mass of D)] c² (where A+B-->C+D)
W=(Force parallel)(distance)= Pressure ? V (change in volume)= qvoltage
K= 9 * 10? Nm²/C²
Fingers= Magnetic Field - Thumb=Velocity - Palm of hand= Force. RH=Proton - LH= electron.


27. (Full/Final) Velocity formula
Fnet=ma
V=IR
Vfinal= V0 +at
G= 6.67 * 10?¹¹ Nm²/kg²


28. How to find total magnification?

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29. Newton's second law
Fnet=ma
K= 9 * 10? Nm²/C²
For every action there is an equal and opposite reaction
Energy of emitted photon = E2-E1 (=Energy level higher- Energy level lower)


30. Relativistic formula for time
En= [Z²/n² * -13.6ev ] (Z is number of protons in atom's nucleus - n is energy level number)
V= 331 m/s + (.6 m/s°C)Temperature
M= -di/do (=-hi/ho)
?Tstationary= Y (?Tmoving)


31. Formula for resistance of an OBJECT
Eff= 1- Qc/Qh = 1- Tc/Th
Q=m*L (where L is the latent heat of fusion or vaporization)
R= ?L/A = (resistivity)(length of wire) / (cross sectional Area)
P=mv (?p=m?v)


32. Work performed by charge displacement? (hopefully...won't have to know)
Distance= velocity * time
W= - kq1q2 (1/r2 - 1/r1)
For every action there is an equal and opposite reaction
Q=m*L (where L is the latent heat of fusion or vaporization)


33. Law of refraction
Q=mc?T (where T is temperature)
Ni sin?i=nrsin?r
E0= 8.85 * 10?¹² C²/(Nm²)
Angle of incidence=Angle of reflection


34. Light intensity is proportional to..
Minimum frequency that needs to illuminate a metal surface for photoELECTRONS to be emitted
W=qVoltage. (think C* J/C and C's cancel out)
PE= 1/2 C (?V)² = 1/2 Q²/C = 1/2 Q?V
Intensity a Amplitude/ d²


35. OPEN PIPE FREQUENCY (Frequency/Harmonic series of a pipe opened at both ends)
F= n * vel/2L n= 1 - 2 - 3... (L= length of pipe) (?=2L/n)
G= 6.67 * 10?¹¹ Nm²/kg²
PV/nT'= p'V'n'T' (p=pressure - V= VOLUME - T= temperature)
The volume of the object.


36. Faraday's law
EMFavg. induced= -?Fb/ ?t (= - change in mag flux/change in time)
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)
Length stationary=Length moving/Y
Q=m*L (where L is the latent heat of fusion or vaporization)


37. Relativistic factor Y formula
Y= 1/ v(1-(v/c)²)
Proton--> Neutron + positron (+ electron-neutrino - v) (° +1 e is produced)
Q= [(mass of A + mass of B) - (mass of C + mass of D)] c² (where A+B-->C+D)
V= 331 m/s + (.6 m/s°C)Temperature


38. Centripetal acceleration formula
Induced current will flow opposite direction of magnetic flux.
?= 4L + 1.6d
Voltage=PE/q (remember Joules/Coulomb= volt)
A=v²/ r


39. Planck's constant in J*s?
P=mv (?p=m?v)
Product of each lens's magnification
EMFavg. induced= -?Fb/ ?t (= - change in mag flux/change in time)
6.6310 ?³4 Js


40. Newton's third law
For every action there is an equal and opposite reaction
Positive - focus in front of the lens (=real image)
F=ILBsin? (?= angle btw. L and B)
R= ?L/A = (resistivity)(length of wire) / (cross sectional Area)


41. Power formula?
F=ILBsin? (?= angle btw. L and B)
I=mr²
A=v²/ r
P=IV=I²R=V² /R = Fd/t= Force*velocity


42. Relativistic formula for velocity
Etotal= E rest + KE= mc² + (Y-1)mc²
Large/high
Felec=qE=[kq1q2]/r²
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)


43. Transformer formula

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44. If you drop an object into water the volume displaced equals...
W=(Force parallel)(distance)= Pressure ? V (change in volume)= qvoltage
Eff= 1- Qc/Qh = 1- Tc/Th
The volume of the object.
Apparent weight = Fb- weight= (mfg) - (m0g) = (mass of displaced fluid gravity) - (initial mass of object while hanging in air gravity) = (DfVfg)- (DoVog)


45. Threshold frequency formula?

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46. Moment of Inertia (a.k.a. rotational mass)
M= -di/do (=-hi/ho)
E= kq/r² (= f/q)
I=mr²
V= 331 m/s + (.6 m/s°C)Temperature


47. Magnetic force formula (for wire)?
Fingers= Magnetic Field - Thumb=Velocity - Palm of hand= Force. RH=Proton - LH= electron.
Q=mc?T (where T is temperature)
C= Q/V = e0 *A/d
F=ILBsin? (?= angle btw. L and B)


48. Formula for how velocity changes in air? (probably don't have to know)
V= 331 m/s + (.6 m/s°C)Temperature
?Tstationary= Y (?Tmoving)
C= 3*108 m/s
Neutron --> Proton + electron ( + electron-antineutrino - V with line over it) ( °?1e produced)


49. Formula for electric field?
Felec=qE=[kq1q2]/r²
E= kq/r² (= f/q)
V= 331 m/s + (.6 m/s°C)Temperature
F= (9/5)C+ 32


50. Sign of focus for concave lens?
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)
Product of each lens's magnification
Large/high
Positive - focus in front of the lens (=real image)