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SAT Subject Test: Physics Formulas

Instructions:

Answer 50 questions in 15 minutes.
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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. Magnification equation
V=f?
M= -di/do (=-hi/ho)
KE= (Y-1)mc² (= (Y-1)E)
F= (9/5)C+ 32

2. Formula for diffraction pattern - Anti-node to Anti-node (A-A)
KEmax= hf-F (= E-F= Energy of a photon - work function)
P=mv (?p=m?v)
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)
W=(Force parallel)(distance)= Pressure ? V (change in volume)= qvoltage

3. Law of reflection
Angle of incidence=Angle of reflection
For every action there is an equal and opposite reaction
E=hf (= Planck's constant*frequency)
1.67*10?²7kg

4. ONE END CAPPED PIPE FREQUENCY (Frequency/Harmonic series of a pipe closed at one ned)
F= n * vel./ 4L n= 1 - 3 - 5.... (L= length of pipe) (?=4L/n)
Minimum frequency that needs to illuminate a metal surface for photoELECTRONS to be emitted
KEmax= hf-F (= E-F= Energy of a photon - work function)
KE= (Y-1)mc² (= (Y-1)E)

5. If speed is slow/low - index of refraction is...
PEspring= 1/2 kx² (K is spring constant - X is distance spring compressed)
Zero.
Negative - focus behind the lens (= virtual image)
Large/high

6. Newton's second law
Etotal= E rest + KE= mc² + (Y-1)mc²
Length stationary=Length moving/Y
Felec=qE=[kq1q2]/r²
Fnet=ma

7. Planck's constant in electronvolts* seconds?
A= A0 e ^ [-?t] (= activity at time t=0 e ^ ( - decay constant * time)
4.14 10?¹5 eVs
Voltage=PE/q (remember Joules/Coulomb= volt)
PV=nRT (p= pressure - V= volume - n= number of moles - T= temperature in KELVIN - R= .0821)

8. 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)
Intensity a Amplitude/ d²
Proton--> Neutron + positron (+ electron-neutrino - v) (° +1 e is produced)
Fb= mass of displaced fluid * gravity

9. Potential Energy 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)
PE=mgh
Angle of incidence=Angle of reflection
Threshold frequency=F/h (= work functions/planck's constant)

10. energy in a reaction q formula?
Eff= 1- Qc/Qh = 1- Tc/Th
E= kq/r² (= f/q)
KEmax= hf-F (= E-F= Energy of a photon - work function)
Q= [(mass of A + mass of B) - (mass of C + mass of D)] c² (where A+B-->C+D)

11. Energy of an emitted photon formula?
Proton--> Neutron + positron (+ electron-neutrino - v) (° +1 e is produced)
Product of each lens's magnification
Energy of emitted photon = E2-E1 (=Energy level higher- Energy level lower)
Fnet=ma

12. If you drop an object into water the volume displaced equals...
K= 9 * 10? Nm²/C²
?p=f?t (where f is AVERAGE force and t is how long force is applied)
The volume of the object.
E= V/d

13. Capacitance formula? (there are two)
C= Q/V = e0 *A/d
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)
Fb= Bperp-to-areaAcos? (Measures density of magnetic field lines that cross through an area)
?= 4L + 1.6d

14. speed of light
C= 3*108 m/s
1/f= 1/di + 1/do
F=GM1M2/r²
Force magnetic= |q|vBsin? (=qVperpendicularB) (?= angle between v and B)

15. 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)
E0= 8.85 * 10?¹² C²/(Nm²)
W=qVoltage. (think C* J/C and C's cancel out)
For every action there is an equal and opposite reaction

16. Torque formula
Torque=force perpendicular to radius r = fr Toruqe=Ia = inertia * angular acceleration
F=mv²/ r
Ni sin?i=nrsin?r
PV/nT'= p'V'n'T' (p=pressure - V= VOLUME - T= temperature)

17. ß? decay?
Neutron --> Proton + electron ( + electron-antineutrino - V with line over it) ( °?1e produced)
Energy of emitted photon = E2-E1 (=Energy level higher- Energy level lower)
?V2/?V1= N2/N1 (if secondary greater than primary it's a step-up transformer).
W=(Force parallel)(distance)= Pressure ? V (change in volume)= qvoltage

18. Light intensity is proportional to..
F=mv²/ r
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)
Force magnetic= |q|vBsin? (=qVperpendicularB) (?= angle between v and B)
Intensity a Amplitude/ d²

19. Centripetal acceleration formula
PV=nRT (p= pressure - V= volume - n= number of moles - T= temperature in KELVIN - R= .0821)
A=v²/ r
PE= 1/2 C (?V)² = 1/2 Q²/C = 1/2 Q?V
?= 4L + 1.6d

20. What is the apparent weight of a floating object?
Etotal= E rest + KE= mc² + (Y-1)mc²
I=mr²
?=h/p (where p= MOMENTUM=m?v - and h is planck's constant)
Zero.

21. Sign of focus for concave lens?
Apparent weight = Fb- weight= (mfg) - (m0g) = (mass of displaced fluid gravity) - (initial mass of object while hanging in air gravity) = (DfVfg)- (DoVog)
C= 3*108 m/s
Negative - focus behind the lens (= virtual image)
Positive - focus in front of the lens (=real image)

22. Faraday's law
EMFavg. induced= -?Fb/ ?t (= - change in mag flux/change in time)
F=GM1M2/r²
M= -di/do (=-hi/ho)
PEspring= 1/2 kx² (K is spring constant - X is distance spring compressed)

23. Relativistic formula for (kinetic) energy
For every action there is an equal and opposite reaction
KE= (Y-1)mc² (= (Y-1)E)
Ebinding= ?m * c² (= (?m)c²)
6.6310 ?³4 Js

24. Work formula
W=(Force parallel)(distance)= Pressure ? V (change in volume)= qvoltage
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)
Negative - focus behind the lens (= virtual image)
PE= 1/2 C (?V)² = 1/2 Q²/C = 1/2 Q?V

25. Newton's third law
E= kq/r² (= f/q)
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)
For every action there is an equal and opposite reaction
6.6310 ?³4 Js

26. If speed is high - index of refraction is....
Neutron --> Proton + electron ( + electron-antineutrino - V with line over it) ( °?1e produced)
Low
Proton--> Neutron + positron (+ electron-neutrino - v) (° +1 e is produced)
Atom + electron--> Neutron (the addition of an electron - °?1e - causes a proton to change into a neutron - i.e. PROTON TRANSFORMS)

27. Converting Fahrenheit to Celsius
Negative - focus behind the lens (= virtual image)
F= (9/5)C+ 32
EMFavg. induced= -?Fb/ ?t (= - change in mag flux/change in time)
Momentum is always conserved in the absence of an outside force

28. Law of refraction
Felec=qE=[kq1q2]/r²
K= 9 * 10? Nm²/C²
Ni sin?i=nrsin?r
W=(Force parallel)(distance)= Pressure ? V (change in volume)= qvoltage

29. Formula for diffraction pattern - Anti-node to node (A-N)
Proton--> Neutron + positron (+ electron-neutrino - v) (° +1 e is produced)
E=hf (= Planck's constant*frequency)
931MeV=1amu
(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)

30. Lenz's law
Induced current will flow opposite direction of magnetic flux.
1/f= 1/di + 1/do
Longer ? - larger diffraction - smaller shadow.
S= 1/2at² + v0t+ d0 (intial distance is often ignored because we decide where we want to start)

31. Electron capture
W=qVoltage. (think C* J/C and C's cancel out)
Threshold frequency=F/h (= work functions/planck's constant)
Atom + electron--> Neutron (the addition of an electron - °?1e - causes a proton to change into a neutron - i.e. PROTON TRANSFORMS)
F=GM1M2/r²

32. Formula for resistance of an OBJECT
Vfinal²=V0²+ 2ad
R= ?L/A = (resistivity)(length of wire) / (cross sectional Area)
Force magnetic= |q|vBsin? (=qVperpendicularB) (?= angle between v and B)
A= A0 e ^ [-?t] (= activity at time t=0 e ^ ( - decay constant * time)

33. Heat of fusion/vaporization fromula
Q=m*L (where L is the latent heat of fusion or vaporization)
W= - kq1q2 (1/r2 - 1/r1)
E= V/d
?IE= - W (work)

34. (Full) Displacement formula
W=(Force parallel)(distance)= Pressure ? V (change in volume)= qvoltage
PV/nT'= p'V'n'T' (p=pressure - V= VOLUME - T= temperature)
Law of inertia. Object in motion stays in motion unless acted upon by an outside force.
S= 1/2at² + v0t+ d0 (intial distance is often ignored because we decide where we want to start)

35. Right-hand rule
Fingers= Magnetic Field - Thumb=Velocity - Palm of hand= Force. RH=Proton - LH= electron.
KE= (Y-1)mc² (= (Y-1)E)
Fb= Bperp-to-areaAcos? (Measures density of magnetic field lines that cross through an area)
Vfinal= V0 +at

36. Moment of Inertia (a.k.a. rotational mass)
PE= 1/2 C (?V)² = 1/2 Q²/C = 1/2 Q?V
1.67*10?²7kg
G= 6.67 * 10?¹¹ Nm²/kg²
I=mr²

37. Centripetal force formula
V= 331 m/s + (.6 m/s°C)Temperature
M= -di/do (=-hi/ho)
F=mv²/ r
Fingers= Magnetic Field - Thumb=Velocity - Palm of hand= Force. RH=Proton - LH= electron.

38. Relativistic formula for velocity
For every action there is an equal and opposite reaction
?p=f?t (where f is AVERAGE force and t is how long force is applied)
G= 6.67 * 10?¹¹ Nm²/kg²
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)

39. Magnetic force formula (for wire)?
P=mv (?p=m?v)
Y= 1/ v(1-(v/c)²)
Q=m*L (where L is the latent heat of fusion or vaporization)
F=ILBsin? (?= angle btw. L and B)

40. Critical angle is...
Q=m*L (where L is the latent heat of fusion or vaporization)
W=(Force parallel)(distance)= Pressure ? V (change in volume)= qvoltage
PE=mgh
The incident angle at which total internal reflection occurs (use ?r=90°)

41. Relativistic factor Y formula
Atom + electron--> Neutron (the addition of an electron - °?1e - causes a proton to change into a neutron - i.e. PROTON TRANSFORMS)
The incident angle at which total internal reflection occurs (use ?r=90°)
Y= 1/ v(1-(v/c)²)
Fb= mass of displaced fluid * gravity

42. ß? decay?
Proton--> Neutron + positron (+ electron-neutrino - v) (° +1 e is produced)
Fnet=ma
?V2/?V1= N2/N1 (if secondary greater than primary it's a step-up transformer).
6.6310 ?³4 Js

43. Threshold frequency explanation?
Intensity a Amplitude/ d²
PE= 1/2 C (?V)² = 1/2 Q²/C = 1/2 Q?V
Minimum frequency that needs to illuminate a metal surface for photoELECTRONS to be emitted
F=mv²/ r

44. Activity of a radioactive sample formula? (probably don't have to know)
En= [Z²/n² * -13.6ev ] (Z is number of protons in atom's nucleus - n is energy level number)
A= A0 e ^ [-?t] (= activity at time t=0 e ^ ( - decay constant * time)
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

45. Maximum KE with which an emitted electron leaves is...?
A=v²/ r
Torque=force perpendicular to radius r = fr Toruqe=Ia = inertia * angular acceleration
N= C/velocity.
KEmax= hf-F (= E-F= Energy of a photon - work function)

46. mass of a proton/neutron (there's a slight difference but ignore it - neutron has slightly more mass)
F=GM1M2/r²
1.67*10?²7kg
P=IV=I²R=V² /R = Fd/t= Force*velocity
E=hf (= Planck's constant*frequency)

47. What is the photoelectric effect?
1.6*10?¹? C
PV/nT'= p'V'n'T' (p=pressure - V= VOLUME - T= temperature)
The release of electrons due to bombardment of an atom by photons (groups of quanta/bundles of matter)
PE= 1/2 C (?V)² = 1/2 Q²/C = 1/2 Q?V

48. Formula for electric potential energy?
PV=nRT (p= pressure - V= volume - n= number of moles - T= temperature in KELVIN - R= .0821)
Positive - focus in front of the lens (=real image)
PE= 1/2 C (?V)² = 1/2 Q²/C = 1/2 Q?V
Vfinal= V0 +at

49. Capacitance constant
V=f?
E0= 8.85 * 10?¹² C²/(Nm²)
K= 9 * 10? Nm²/C²
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)

50. Work performed by charge displacement? (hopefully...won't have to know)
C= Q/V = e0 *A/d
Atom + electron--> Neutron (the addition of an electron - °?1e - causes a proton to change into a neutron - i.e. PROTON TRANSFORMS)
W= - kq1q2 (1/r2 - 1/r1)
F= n * vel/2L n= 1 - 2 - 3... (L= length of pipe) (?=2L/n)