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. Electric force formula? (two)
Fb= Bperp-to-areaAcos? (Measures density of magnetic field lines that cross through an area)
Felec=qE=[kq1q2]/r²
Q=m*L (where L is the latent heat of fusion or vaporization)
Product of each lens's magnification


2. K constant for electric field formula?
1/f= 1/di + 1/do
?p=f?t (where f is AVERAGE force and t is how long force is applied)
K= 9 * 10? Nm²/C²
Ebinding= ?m * c² (= (?m)c²)


3. Formula for electric potential energy?
PE= 1/2 C (?V)² = 1/2 Q²/C = 1/2 Q?V
A=v²/ r
Minimum frequency that needs to illuminate a metal surface for photoELECTRONS to be emitted
Longer ? - larger diffraction - smaller shadow.


4. Lenz's law
Induced current will flow opposite direction of magnetic flux.
Negative - focus behind the lens (= virtual image)
C= 3*108 m/s
P=IV=I²R=V² /R = Fd/t= Force*velocity


5. (Full) Displacement formula
Positive - focus in front of the lens (=real image)
Length stationary=Length moving/Y
S= 1/2at² + v0t+ d0 (intial distance is often ignored because we decide where we want to start)
Fb= mass of displaced fluid * gravity


6. Efficiency of an engine formula
Eff= 1- Qc/Qh = 1- Tc/Th
P=IV=I²R=V² /R = Fd/t= Force*velocity
KE= (Y-1)mc² (= (Y-1)E)
PEspring= 1/2 kx² (K is spring constant - X is distance spring compressed)


7. Converting Fahrenheit to Celsius
S= 1/2at² + v0t+ d0 (intial distance is often ignored because we decide where we want to start)
1/f= 1/di + 1/do
F= (9/5)C+ 32
Felec=qE=[kq1q2]/r²


8. Index of refraction formula
4.14 10?¹5 eVs
N= C/velocity.
P=IV=I²R=V² /R = Fd/t= Force*velocity
En= [Z²/n² * -13.6ev ] (Z is number of protons in atom's nucleus - n is energy level number)


9. If speed is high - index of refraction is....
Minimal energy that needs to be imparted to an electron on metal surface in order to liberate it.
Intensity a Amplitude/ d²
Low
G= 6.67 * 10?¹¹ Nm²/kg²


10. Relativistic formula for length
E0= 8.85 * 10?¹² C²/(Nm²)
Length stationary=Length moving/Y
?= 4L + 1.6d
Fingers= Magnetic Field - Thumb=Velocity - Palm of hand= Force. RH=Proton - LH= electron.


11. Graviational force formula
K= 9 * 10? Nm²/C²
F=GM1M2/r²
P=mv (?p=m?v)
4.14 10?¹5 eVs


12. Light intensity is proportional to..
Intensity a Amplitude/ d²
Eff= 1- Qc/Qh = 1- Tc/Th
1/f= 1/di + 1/do
Etotal= E rest + KE= mc² + (Y-1)mc²


13. Relativistic factor Y formula
E=hf (= Planck's constant*frequency)
The volume of the object.
Y= 1/ v(1-(v/c)²)
Voltage=PE/q (remember Joules/Coulomb= volt)


14. Magnetic force formula (for particle)?
R= ?L/A = (resistivity)(length of wire) / (cross sectional Area)
Force magnetic= |q|vBsin? (=qVperpendicularB) (?= angle between v and B)
P=IV=I²R=V² /R = Fd/t= Force*velocity
Large/high


15. Planck's constant in J*s?
Length stationary=Length moving/Y
Zero.
A=v²/ r
6.6310 ?³4 Js


16. Power formula?
?Tstationary= Y (?Tmoving)
E= kq/r² (= f/q)
P=IV=I²R=V² /R = Fd/t= Force*velocity
Voltage=PE/q (remember Joules/Coulomb= volt)


17. (Full/Final) Velocity formula
Shorter ? - less diffraction - bigger shadow.
Vfinal= V0 +at
Vfinal²=V0²+ 2ad
PV=nRT (p= pressure - V= volume - n= number of moles - T= temperature in KELVIN - R= .0821)


18. Heat of fusion/vaporization fromula
Q=m*L (where L is the latent heat of fusion or vaporization)
I=mr²
E0= 8.85 * 10?¹² C²/(Nm²)
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)


19. Formula for resistance of an OBJECT
PE= 1/2 C (?V)² = 1/2 Q²/C = 1/2 Q?V
R= ?L/A = (resistivity)(length of wire) / (cross sectional Area)
PEspring= 1/2 kx² (K is spring constant - X is distance spring compressed)
Low


20. Faraday's law
EMFavg. induced= -?Fb/ ?t (= - change in mag flux/change in time)
Minimal energy that needs to be imparted to an electron on metal surface in order to liberate it.
PV/nT'= p'V'n'T' (p=pressure - V= VOLUME - T= temperature)
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)


21. Threshold frequency formula?

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22. Relativistic formula for time
PE= 1/2 C (?V)² = 1/2 Q²/C = 1/2 Q?V
En= [Z²/n² * -13.6ev ] (Z is number of protons in atom's nucleus - n is energy level number)
1.67*10?²7kg
?Tstationary= Y (?Tmoving)


23. Formula for energy of a photon?

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24. Newton's first law (Law of...)
W= - kq1q2 (1/r2 - 1/r1)
?p=f?t (where f is AVERAGE force and t is how long force is applied)
Vfinal²=V0²+ 2ad
Law of inertia. Object in motion stays in motion unless acted upon by an outside force.


25. Torque formula
Torque=force perpendicular to radius r = fr Toruqe=Ia = inertia * angular acceleration
Vfinal²=V0²+ 2ad
Apparent weight = Fb- weight= (mfg) - (m0g) = (mass of displaced fluid gravity) - (initial mass of object while hanging in air gravity) = (DfVfg)- (DoVog)
I=mr²


26. Formula for electric field?
?Tstationary= Y (?Tmoving)
E= kq/r² (= f/q)
KE= (Y-1)mc² (= (Y-1)E)
Energy it takes to break a nucleus into separate protons and neutrons (same as energy lost to create atom.)


27. Centripetal acceleration formula
A=v²/ r
Positive - focus in front of the lens (=real image)
W=(Force parallel)(distance)= Pressure ? V (change in volume)= qvoltage
?= 4L + 1.6d


28. Relativistic formula for velocity
W=(Force parallel)(distance)= Pressure ? V (change in volume)= qvoltage
Law of inertia. Object in motion stays in motion unless acted upon by an outside force.
?=h/p (where p= MOMENTUM=m?v - and h is planck's 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)


29. Formula for energy levels within any atom?

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30. Moment of Inertia (a.k.a. rotational mass)
PE=mgh
The volume of the object.
I=mr²
Zero.


31. New/old gas formula?

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32. Formula for velocity of waves?
For every action there is an equal and opposite reaction
V=f?
N= C/velocity.
Voltage=PE/q (remember Joules/Coulomb= volt)


33. What is the photoelectric effect?
V= 331 m/s + (.6 m/s°C)Temperature
4.14 10?¹5 eVs
The release of electrons due to bombardment of an atom by photons (groups of quanta/bundles of matter)
A=v²/ r


34. Centripetal force formula
Vfinal= V0 +at
F=mv²/ r
Etotal= E rest + KE= mc² + (Y-1)mc²
PV=nRT (p= pressure - V= volume - n= number of moles - T= temperature in KELVIN - R= .0821)


35. Newton's second law
Momentum is always conserved in the absence of 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)
Fnet=ma
F=GM1M2/r²


36. Buoyant force formula
Q=m*L (where L is the latent heat of fusion or vaporization)
S= 1/2at² + v0t+ d0 (intial distance is often ignored because we decide where we want to start)
The volume of the object.
Fb= mass of displaced fluid * gravity


37. Critical angle is...
Ni sin?i=nrsin?r
1.67*10?²7kg
The incident angle at which total internal reflection occurs (use ?r=90°)
F= (9/5)C+ 32


38. Magnification equation
M= -di/do (=-hi/ho)
V= 331 m/s + (.6 m/s°C)Temperature
Fingers= Magnetic Field - Thumb=Velocity - Palm of hand= Force. RH=Proton - LH= electron.
?= 4L + 1.6d


39. 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)
Induced current will flow opposite direction of magnetic flux.
EMFavg. induced= -?Fb/ ?t (= - change in mag flux/change in time)
931MeV=1amu


40. OPEN PIPE FREQUENCY (Frequency/Harmonic series of a pipe opened at both ends)
E0= 8.85 * 10?¹² C²/(Nm²)
Threshold frequency=F/h (= work functions/planck's constant)
F= n * vel/2L n= 1 - 2 - 3... (L= length of pipe) (?=2L/n)
Q=m*L (where L is the latent heat of fusion or vaporization)


41. Electron capture
Ni sin?i=nrsin?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)
Atom + electron--> Neutron (the addition of an electron - °?1e - causes a proton to change into a neutron - i.e. PROTON TRANSFORMS)
C= Q/V = e0 *A/d


42. Formula for diffraction pattern - Anti-node to Anti-node (A-A)
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)
?IE= - W (work)
Shorter ? - less diffraction - bigger shadow.
Vfinal= V0 +at


43. Maximum KE with which an emitted electron leaves is...?
Force magnetic= |q|vBsin? (=qVperpendicularB) (?= angle between v and B)
Large/high
KEmax= hf-F (= E-F= Energy of a photon - work function)
V= 331 m/s + (.6 m/s°C)Temperature


44. Formula for diffraction pattern - Anti-node to node (A-N)
PE= 1/2 C (?V)² = 1/2 Q²/C = 1/2 Q?V
R= ?L/A = (resistivity)(length of wire) / (cross sectional Area)
Particles in motion can display wave characteristics - and behave as if they had wavelength (?= h/p)
(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)


45. Threshold frequency explanation?
V= 331 m/s + (.6 m/s°C)Temperature
Minimum frequency that needs to illuminate a metal surface for photoELECTRONS to be emitted
Beat frequency= |F1-F2|
Vfinal²=V0²+ 2ad


46. deBrolglie wavelength formula

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47. Law of reflection
P=IV=I²R=V² /R = Fd/t= Force*velocity
Force magnetic= |q|vBsin? (=qVperpendicularB) (?= angle between v and B)
Angle of incidence=Angle of reflection
V=IR


48. Gravitational constant
Energy of emitted photon = E2-E1 (=Energy level higher- Energy level lower)
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)
G= 6.67 * 10?¹¹ Nm²/kg²
I=mr²


49. Magnetic force formula (for wire)?
F=ILBsin? (?= angle btw. L and B)
Longer ? - larger diffraction - smaller shadow.
Angle of incidence=Angle of reflection
Distance= velocity * time


50. Potential Energy formula
A=v²/ r
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
P=mv (?p=m?v)