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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. Elastic potential energy for a spring formula
PEspring= 1/2 kx² (K is spring constant - X is distance spring compressed)
F=ILBsin? (?= angle btw. L and B)
Energy of emitted photon = E2-E1 (=Energy level higher- Energy level lower)
KE= (Y-1)mc² (= (Y-1)E)

2. Electric field between two plates formula?
Angle of incidence=Angle of reflection
M= -di/do (=-hi/ho)
E=hf (= Planck's constant*frequency)
E= V/d

3. Torque formula
Torque=force perpendicular to radius r = fr Toruqe=Ia = inertia * angular acceleration
G= 6.67 * 10?¹¹ Nm²/kg²
F=mv²/ r
KE= (Y-1)mc² (= (Y-1)E)

4. (Full) Displacement formula
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)
?Tstationary= Y (?Tmoving)
S= 1/2at² + v0t+ d0 (intial distance is often ignored because we decide where we want to start)
(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)

5. Power formula?
For every action there is an equal and opposite reaction
E=hf (= Planck's constant*frequency)
P=IV=I²R=V² /R = Fd/t= Force*velocity
Ebinding= ?m * c² (= (?m)c²)

6. Apparent weight (weight of submerged object)
Fingers= Magnetic Field - Thumb=Velocity - Palm of hand= Force. RH=Proton - LH= electron.
Apparent weight = Fb- weight= (mfg) - (m0g) = (mass of displaced fluid gravity) - (initial mass of object while hanging in air gravity) = (DfVfg)- (DoVog)
Eff= 1- Qc/Qh = 1- Tc/Th
R= ?L/A = (resistivity)(length of wire) / (cross sectional Area)

7. Heat formula
Q=mc?T (where T is temperature)
931MeV=1amu
For every action there is an equal and opposite reaction
G= 6.67 * 10?¹¹ Nm²/kg²

8. Potential Energy formula
Energy of emitted photon = E2-E1 (=Energy level higher- Energy level lower)
Distance= velocity * time
The release of electrons due to bombardment of an atom by photons (groups of quanta/bundles of matter)
PE=mgh

9. Formula for velocity of waves?
F=mv²/ r
V=f?
The volume of the object.
Minimal energy that needs to be imparted to an electron on metal surface in order to liberate it.

10. Capacitance formula? (there are two)
KE= (Y-1)mc² (= (Y-1)E)
Fnet=ma
Fb= Bperp-to-areaAcos? (Measures density of magnetic field lines that cross through an area)
C= Q/V = e0 *A/d

11. Lenz's law
Force magnetic= |q|vBsin? (=qVperpendicularB) (?= angle between v and B)
W=(Force parallel)(distance)= Pressure ? V (change in volume)= qvoltage
Fb= Bperp-to-areaAcos? (Measures density of magnetic field lines that cross through an area)
Induced current will flow opposite direction of magnetic flux.

12. High frequency wave shave...
W= - kq1q2 (1/r2 - 1/r1)
Positive - focus in front of the lens (=real image)
Shorter ? - less diffraction - bigger shadow.
C= Q/V = e0 *A/d

13. Correction factor for wavelength in a diffraction experiment (probably don't have to know)
?= 4L + 1.6d
PV/nT'= p'V'n'T' (p=pressure - V= VOLUME - T= temperature)
M= -di/do (=-hi/ho)
Length stationary=Length moving/Y

14. speed of light
Force magnetic= |q|vBsin? (=qVperpendicularB) (?= angle between v and B)
A= A0 e ^ [-?t] (= activity at time t=0 e ^ ( - decay constant * time)
C= 3*108 m/s
?p=f?t (where f is AVERAGE force and t is how long force is applied)

15. ß? decay?
Shorter ? - less diffraction - bigger shadow.
Neutron --> Proton + electron ( + electron-antineutrino - V with line over it) ( °?1e produced)
?=h/p (where p= MOMENTUM=m?v - and h is planck's constant)
?V2/?V1= N2/N1 (if secondary greater than primary it's a step-up transformer).

16. Heat of fusion/vaporization fromula
Eff= 1- Qc/Qh = 1- Tc/Th
Large/high
Q=m*L (where L is the latent heat of fusion or vaporization)
Torque=force perpendicular to radius r = fr Toruqe=Ia = inertia * angular acceleration

17. ONE END CAPPED PIPE FREQUENCY (Frequency/Harmonic series of a pipe closed at one ned)
EMFavg. induced= -?Fb/ ?t (= - change in mag flux/change in time)
F= n * vel./ 4L n= 1 - 3 - 5.... (L= length of pipe) (?=4L/n)
I=mr²
P=mv (?p=m?v)

18. Threshold frequency formula?

19. Newton's second law
Intensity a Amplitude/ d²
Fnet=ma
Vfinal= V0 +at
Felec=qE=[kq1q2]/r²

20. energy in a reaction q formula?
Threshold frequency=F/h (= work functions/planck's constant)
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
?=h/p (where p= MOMENTUM=m?v - and h is planck's constant)

21. Binding energy formula
Zero.
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)
Ebinding= ?m * c² (= (?m)c²)
F= n * vel/2L n= 1 - 2 - 3... (L= length of pipe) (?=2L/n)

22. Light intensity is proportional to..
Y= 1/ v(1-(v/c)²)
P=IV=I²R=V² /R = Fd/t= Force*velocity
Intensity a Amplitude/ d²
Eff= 1- Qc/Qh = 1- Tc/Th

23. Internal energy....equals?
?IE= - W (work)
F=ILBsin? (?= angle btw. L and B)
C= 3*108 m/s
Negative - focus behind the lens (= virtual image)

24. Formula for electric field?
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)
E= kq/r² (= f/q)
Neutron --> Proton + electron ( + electron-antineutrino - V with line over it) ( °?1e produced)
Voltage=PE/q (remember Joules/Coulomb= volt)

25. Converting Fahrenheit to Celsius
?p=f?t (where f is AVERAGE force and t is how long force is applied)
Longer ? - larger diffraction - smaller shadow.
F= (9/5)C+ 32
PE= 1/2 C (?V)² = 1/2 Q²/C = 1/2 Q?V

26. Magnetic force formula (for wire)?
Proton--> Neutron + positron (+ electron-neutrino - v) (° +1 e is produced)
?=h/p (where p= MOMENTUM=m?v - and h is planck's constant)
F=ILBsin? (?= angle btw. L and B)
Ebinding= ?m * c² (= (?m)c²)

27. (Full/Final) Velocity formula
Ebinding= ?m * c² (= (?m)c²)
Minimum frequency that needs to illuminate a metal surface for photoELECTRONS to be emitted
Vfinal= V0 +at
N= C/velocity.

28. Work performed by charge displacement? (hopefully...won't have to know)
Law of inertia. Object in motion stays in motion unless acted upon by an outside force.
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= - kq1q2 (1/r2 - 1/r1)
Fb= Bperp-to-areaAcos? (Measures density of magnetic field lines that cross through an area)

29. Buoyant force formula
Atom + electron--> Neutron (the addition of an electron - °?1e - causes a proton to change into a neutron - i.e. PROTON TRANSFORMS)
Law of inertia. Object in motion stays in motion unless acted upon by an outside force.
Fb= mass of displaced fluid * gravity
PV=nRT (p= pressure - V= volume - n= number of moles - T= temperature in KELVIN - R= .0821)

30. Binding energy explanation
1.67*10?²7kg
Proton--> Neutron + positron (+ electron-neutrino - v) (° +1 e is produced)
Length stationary=Length moving/Y
Energy it takes to break a nucleus into separate protons and neutrons (same as energy lost to create atom.)

31. Relativistic factor Y formula
(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)
1.6*10?¹? C
Vfinal²=V0²+ 2ad
Y= 1/ v(1-(v/c)²)

32. Voltage formula (think units of volts are what?) (NOT in terms of I and R)
PV/nT'= p'V'n'T' (p=pressure - V= VOLUME - T= temperature)
Voltage=PE/q (remember Joules/Coulomb= volt)
Felec=qE=[kq1q2]/r²
Force magnetic= |q|vBsin? (=qVperpendicularB) (?= angle between v and B)

33. Beat frequency
F= n * vel/2L n= 1 - 2 - 3... (L= length of pipe) (?=2L/n)
Beat frequency= |F1-F2|
V= 331 m/s + (.6 m/s°C)Temperature
KEmax= hf-F (= E-F= Energy of a photon - work function)

34. Total KE formula
Large/high
E= V/d
Etotal= E rest + KE= mc² + (Y-1)mc²
The release of electrons due to bombardment of an atom by photons (groups of quanta/bundles of matter)

35. Formula for electric potential energy?
A=v²/ r
Y= 1/ v(1-(v/c)²)
PE= 1/2 C (?V)² = 1/2 Q²/C = 1/2 Q?V
W=qVoltage. (think C* J/C and C's cancel out)

36. deBrolglie wavelength formula

37. Planck's constant in electronvolts* seconds?
PEspring= 1/2 kx² (K is spring constant - X is distance spring compressed)
F= n * vel/2L n= 1 - 2 - 3... (L= length of pipe) (?=2L/n)
Ebinding= ?m * c² (= (?m)c²)
4.14 10?¹5 eVs

38. Momentum formula?
P=mv (?p=m?v)
PV=nRT (p= pressure - V= volume - n= number of moles - T= temperature in KELVIN - R= .0821)
Fnet=ma
F= (9/5)C+ 32

39. If you drop an object into water the volume displaced equals...
Large/high
Ni sin?i=nrsin?r
The volume of the object.
G= 6.67 * 10?¹¹ Nm²/kg²

40. Low frequency waves have...
P=mv (?p=m?v)
Neutron --> Proton + electron ( + electron-antineutrino - V with line over it) ( °?1e produced)
I=mr²
Longer ? - larger diffraction - smaller shadow.

41. Centripetal force formula
Apparent weight = Fb- weight= (mfg) - (m0g) = (mass of displaced fluid gravity) - (initial mass of object while hanging in air gravity) = (DfVfg)- (DoVog)
E=hf (= Planck's constant*frequency)
F=mv²/ r
Vfinal²=V0²+ 2ad

42. K constant for electric field formula?
Q= [(mass of A + mass of B) - (mass of C + mass of D)] c² (where A+B-->C+D)
K= 9 * 10? Nm²/C²
931MeV=1amu
P=mv (?p=m?v)

43. Centripetal acceleration formula
Q=mc?T (where T is temperature)
R= ?L/A = (resistivity)(length of wire) / (cross sectional Area)
A=v²/ r
Felec=qE=[kq1q2]/r²

44. Law of reflection
M= -di/do (=-hi/ho)
Ni sin?i=nrsin?r
Angle of incidence=Angle of reflection
E= V/d

45. deBroglie wavelength explanation
Law of inertia. Object in motion stays in motion unless acted upon by an outside force.
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)
Particles in motion can display wave characteristics - and behave as if they had wavelength (?= h/p)
Fnet=ma

46. How to find total magnification?

47. Sign of focus for convex lens?
Negative - focus behind the lens (= virtual image)
Large/high
Threshold frequency=F/h (= work functions/planck's constant)
Induced current will flow opposite direction of magnetic flux.

48. Formula for energy levels within any atom?

49. Formula for magnetic flux?
C= 3*108 m/s
V=IR
Fb= Bperp-to-areaAcos? (Measures density of magnetic field lines that cross through an area)
PE= 1/2 C (?V)² = 1/2 Q²/C = 1/2 Q?V

50. Faraday's law
KE= (Y-1)mc² (= (Y-1)E)
M= -di/do (=-hi/ho)
EMFavg. induced= -?Fb/ ?t (= - change in mag flux/change in time)
F=ILBsin? (?= angle btw. L and B)