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. Beat frequency
Length stationary=Length moving/Y
M= -di/do (=-hi/ho)
Beat frequency= |F1-F2|
?V2/?V1= N2/N1 (if secondary greater than primary it's a step-up transformer).


2. Apparent weight (weight of submerged object)
?IE= - W (work)
Apparent weight = Fb- weight= (mfg) - (m0g) = (mass of displaced fluid gravity) - (initial mass of object while hanging in air gravity) = (DfVfg)- (DoVog)
Fb= Bperp-to-areaAcos? (Measures density of magnetic field lines that cross through an area)
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)


3. Right-hand rule
Fingers= Magnetic Field - Thumb=Velocity - Palm of hand= Force. RH=Proton - LH= electron.
4.14 10?¹5 eVs
Minimal energy that needs to be imparted to an electron on metal surface in order to liberate it.
?=h/p (where p= MOMENTUM=m?v - and h is planck's constant)


4. If speed is slow/low - index of refraction is...
Beat frequency= |F1-F2|
?Tstationary= Y (?Tmoving)
Large/high
F= n * vel/2L n= 1 - 2 - 3... (L= length of pipe) (?=2L/n)


5. Formula for diffraction pattern - Anti-node to Anti-node (A-A)
Beat frequency= |F1-F2|
Apparent weight = Fb- weight= (mfg) - (m0g) = (mass of displaced fluid gravity) - (initial mass of object while hanging in air gravity) = (DfVfg)- (DoVog)
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)
F= n * vel/2L n= 1 - 2 - 3... (L= length of pipe) (?=2L/n)


6. Formula for velocity of waves?
P=mv (?p=m?v)
V=f?
M= -di/do (=-hi/ho)
Eff= 1- Qc/Qh = 1- Tc/Th


7. ß? decay?
KE=1/2mv²
Zero.
The incident angle at which total internal reflection occurs (use ?r=90°)
Proton--> Neutron + positron (+ electron-neutrino - v) (° +1 e is produced)


8. Electron capture
Fingers= Magnetic Field - Thumb=Velocity - Palm of hand= Force. RH=Proton - LH= electron.
Atom + electron--> Neutron (the addition of an electron - °?1e - causes a proton to change into a neutron - i.e. PROTON TRANSFORMS)
Length stationary=Length moving/Y
?V2/?V1= N2/N1 (if secondary greater than primary it's a step-up transformer).


9. ß? decay?
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)
?p=f?t (where f is AVERAGE force and t is how long force is applied)
PE=mgh
Neutron --> Proton + electron ( + electron-antineutrino - V with line over it) ( °?1e produced)


10. Work formula
?p=f?t (where f is AVERAGE force and t is how long force is applied)
En= [Z²/n² * -13.6ev ] (Z is number of protons in atom's nucleus - n is energy level number)
P=IV=I²R=V² /R = Fd/t= Force*velocity
W=(Force parallel)(distance)= Pressure ? V (change in volume)= qvoltage


11. If speed is high - index of refraction is....
A=v²/ r
Vfinal= V0 +at
V=f?
Low


12. Activity of a radioactive sample formula? (probably don't have to know)
A= A0 e ^ [-?t] (= activity at time t=0 e ^ ( - decay constant * time)
M= -di/do (=-hi/ho)
Fingers= Magnetic Field - Thumb=Velocity - Palm of hand= Force. RH=Proton - LH= electron.
931MeV=1amu


13. Momentum formula?
P=mv (?p=m?v)
Neutron --> Proton + electron ( + electron-antineutrino - V with line over it) ( °?1e produced)
I=mr²
(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)


14. Index of refraction formula
Fnet=ma
N= C/velocity.
C= 3*108 m/s
E0= 8.85 * 10?¹² C²/(Nm²)


15. Velocity formula if time not given
W= - kq1q2 (1/r2 - 1/r1)
Vfinal²=V0²+ 2ad
W=qVoltage. (think C* J/C and C's cancel out)
Large/high


16. Centripetal force formula
V= 331 m/s + (.6 m/s°C)Temperature
F=mv²/ r
Torque=force perpendicular to radius r = fr Toruqe=Ia = inertia * angular acceleration
?V2/?V1= N2/N1 (if secondary greater than primary it's a step-up transformer).


17. Planck's constant in J*s?
Ni sin?i=nrsin?r
En= [Z²/n² * -13.6ev ] (Z is number of protons in atom's nucleus - n is energy level number)
6.6310 ?³4 Js
K= 9 * 10? Nm²/C²


18. Transformer formula

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19. Low frequency waves have...
W= - kq1q2 (1/r2 - 1/r1)
Longer ? - larger diffraction - smaller shadow.
Eff= 1- Qc/Qh = 1- Tc/Th
Angle of incidence=Angle of reflection


20. Gravitational constant
1.67*10?²7kg
F= n * vel/2L n= 1 - 2 - 3... (L= length of pipe) (?=2L/n)
G= 6.67 * 10?¹¹ Nm²/kg²
?=h/p (where p= MOMENTUM=m?v - and h is planck's constant)


21. K constant for electric field formula?
K= 9 * 10? Nm²/C²
Fnet=ma
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)
Felec=qE=[kq1q2]/r²


22. Newton's third law
For every action there is an equal and opposite reaction
Vfinal= V0 +at
Threshold frequency=F/h (= work functions/planck's constant)
KE=1/2mv²


23. What is the apparent weight of a floating object?
Force magnetic= |q|vBsin? (=qVperpendicularB) (?= angle between v and B)
?IE= - W (work)
Zero.
6.6310 ?³4 Js


24. Mass defect explanation

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25. deBrolglie wavelength formula

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26. New/old gas formula?

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27. deBroglie wavelength explanation
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)
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)
PE=mgh


28. Law of reflection
?Tstationary= Y (?Tmoving)
F=mv²/ r
Angle of incidence=Angle of reflection
G= 6.67 * 10?¹¹ Nm²/kg²


29. Relativistic formula for velocity
Energy of emitted photon = E2-E1 (=Energy level higher- Energy level lower)
F=mv²/ r
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)
Low


30. magnitude of charge on electron/proton
Beat frequency= |F1-F2|
K= 9 * 10? Nm²/C²
Torque=force perpendicular to radius r = fr Toruqe=Ia = inertia * angular acceleration
1.6*10?¹? C


31. Voltage formula (think units of volts are what?) (NOT in terms of I and R)
E= V/d
Shorter ? - less diffraction - bigger shadow.
Voltage=PE/q (remember Joules/Coulomb= volt)
Neutron --> Proton + electron ( + electron-antineutrino - V with line over it) ( °?1e produced)


32. Relativistic formula for time
?Tstationary= Y (?Tmoving)
1.6*10?¹? C
W= - kq1q2 (1/r2 - 1/r1)
?V2/?V1= N2/N1 (if secondary greater than primary it's a step-up transformer).


33. Work function F is..?
Fingers= Magnetic Field - Thumb=Velocity - Palm of hand= Force. RH=Proton - LH= electron.
F= n * vel./ 4L n= 1 - 3 - 5.... (L= length of pipe) (?=4L/n)
Minimal energy that needs to be imparted to an electron on metal surface in order to liberate it.
?= 4L + 1.6d


34. Relativistic formula for length
Voltage=PE/q (remember Joules/Coulomb= volt)
En= [Z²/n² * -13.6ev ] (Z is number of protons in atom's nucleus - n is energy level number)
Length stationary=Length moving/Y
Atom + electron--> Neutron (the addition of an electron - °?1e - causes a proton to change into a neutron - i.e. PROTON TRANSFORMS)


35. Distance formula?
F= n * vel/2L n= 1 - 2 - 3... (L= length of pipe) (?=2L/n)
I=mr²
EMFavg. induced= -?Fb/ ?t (= - change in mag flux/change in time)
Distance= velocity * time


36. Graviational force formula
N= C/velocity.
Force magnetic= |q|vBsin? (=qVperpendicularB) (?= angle between v and B)
PV/nT'= p'V'n'T' (p=pressure - V= VOLUME - T= temperature)
F=GM1M2/r²


37. energy in a reaction q formula?
Q= [(mass of A + mass of B) - (mass of C + mass of D)] c² (where A+B-->C+D)
C= Q/V = e0 *A/d
(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)
Zero.


38. Potential Energy formula
E= V/d
I=mr²
P=mv (?p=m?v)
PE=mgh


39. Sign of focus for convex lens?
C= 3*108 m/s
1.6*10?¹? C
Negative - focus behind the lens (= virtual image)
Fingers= Magnetic Field - Thumb=Velocity - Palm of hand= Force. RH=Proton - LH= electron.


40. Capacitance constant
PV/nT'= p'V'n'T' (p=pressure - V= VOLUME - T= temperature)
Large/high
K= 9 * 10? Nm²/C²
E0= 8.85 * 10?¹² C²/(Nm²)


41. mass of a proton/neutron (there's a slight difference but ignore it - neutron has slightly more mass)
Intensity a Amplitude/ d²
The release of electrons due to bombardment of an atom by photons (groups of quanta/bundles of matter)
KEmax= hf-F (= E-F= Energy of a photon - work function)
1.67*10?²7kg


42. Electric field between two plates formula?
Voltage=PE/q (remember Joules/Coulomb= volt)
V=IR
E= V/d
Angle of incidence=Angle of reflection


43. Planck's constant in electronvolts* seconds?
Q= [(mass of A + mass of B) - (mass of C + mass of D)] c² (where A+B-->C+D)
Energy of emitted photon = E2-E1 (=Energy level higher- Energy level lower)
PV=nRT (p= pressure - V= volume - n= number of moles - T= temperature in KELVIN - R= .0821)
4.14 10?¹5 eVs


44. Moment of Inertia (a.k.a. rotational mass)
KE=1/2mv²
I=mr²
Vfinal²=V0²+ 2ad
6.6310 ?³4 Js


45. How to find total magnification?

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46. Threshold frequency formula?

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47. Threshold frequency explanation?
E0= 8.85 * 10?¹² C²/(Nm²)
KE=1/2mv²
The volume of the object.
Minimum frequency that needs to illuminate a metal surface for photoELECTRONS to be emitted


48. Work performed by charge displacement? (hopefully...won't have to know)
W= - kq1q2 (1/r2 - 1/r1)
The volume of the object.
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)
Voltage=PE/q (remember Joules/Coulomb= volt)


49. Elastic potential energy for a spring formula
PEspring= 1/2 kx² (K is spring constant - X is distance spring compressed)
F= n * vel./ 4L n= 1 - 3 - 5.... (L= length of pipe) (?=4L/n)
Neutron --> Proton + electron ( + electron-antineutrino - V with line over it) ( °?1e produced)
Etotal= E rest + KE= mc² + (Y-1)mc²


50. Magnetic force formula (for wire)?
F=ILBsin? (?= angle btw. L and B)
Atom + electron--> Neutron (the addition of an electron - °?1e - causes a proton to change into a neutron - i.e. PROTON TRANSFORMS)
En= [Z²/n² * -13.6ev ] (Z is number of protons in atom's nucleus - n is energy level number)
Etotal= E rest + KE= mc² + (Y-1)mc²