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. Index of refraction formula
The incident angle at which total internal reflection occurs (use ?r=90°)
Ebinding= ?m * c² (= (?m)c²)
N= C/velocity.
W=(Force parallel)(distance)= Pressure ? V (change in volume)= qvoltage


2. Relativistic formula for (kinetic) energy
1.67*10?²7kg
E=hf (= Planck's constant*frequency)
Etotal= E rest + KE= mc² + (Y-1)mc²
KE= (Y-1)mc² (= (Y-1)E)


3. Electric field between two plates formula?
Vfinal= V0 +at
Felec=qE=[kq1q2]/r²
E= V/d
PV/nT'= p'V'n'T' (p=pressure - V= VOLUME - T= temperature)


4. Threshold frequency formula?

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5. Torque formula
Torque=force perpendicular to radius r = fr Toruqe=Ia = inertia * angular acceleration
Energy of emitted photon = E2-E1 (=Energy level higher- Energy level lower)
Fb= Bperp-to-areaAcos? (Measures density of magnetic field lines that cross through an area)
C= Q/V = e0 *A/d


6. Capacitance constant
I=mr²
Zero.
Etotal= E rest + KE= mc² + (Y-1)mc²
E0= 8.85 * 10?¹² C²/(Nm²)


7. Impulse formula
Proton--> Neutron + positron (+ electron-neutrino - v) (° +1 e is produced)
Low
?p=f?t (where f is AVERAGE force and t is how long force is applied)
KE=1/2mv²


8. Newton's second law
Negative - focus behind the lens (= virtual image)
Fnet=ma
F=ILBsin? (?= angle btw. L and B)
Ni sin?i=nrsin?r


9. What is the photoelectric effect?
The release of electrons due to bombardment of an atom by photons (groups of quanta/bundles of matter)
F= n * vel/2L n= 1 - 2 - 3... (L= length of pipe) (?=2L/n)
PV=nRT (p= pressure - V= volume - n= number of moles - T= temperature in KELVIN - R= .0821)
M= -di/do (=-hi/ho)


10. Heat of fusion/vaporization fromula
F= n * vel./ 4L n= 1 - 3 - 5.... (L= length of pipe) (?=4L/n)
Q=m*L (where L is the latent heat of fusion or vaporization)
PV=nRT (p= pressure - V= volume - n= number of moles - T= temperature in KELVIN - R= .0821)
The volume of the object.


11. K constant for electric field formula?
Fb= Bperp-to-areaAcos? (Measures density of magnetic field lines that cross through an area)
K= 9 * 10? Nm²/C²
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)


12. 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)
V= 331 m/s + (.6 m/s°C)Temperature
W=(Force parallel)(distance)= Pressure ? V (change in volume)= qvoltage
Beat frequency= |F1-F2|


13. Conservation of momentum
K= 9 * 10? Nm²/C²
M= -di/do (=-hi/ho)
Momentum is always conserved in the absence of an outside force
PV=nRT (p= pressure - V= volume - n= number of moles - T= temperature in KELVIN - R= .0821)


14. Sign of focus for convex lens?
C= 3*108 m/s
E= kq/r² (= f/q)
Distance= velocity * time
Negative - focus behind the lens (= virtual image)


15. Conversion factor from atomic mass units to MeV?
Felec=qE=[kq1q2]/r²
Negative - focus behind the lens (= virtual image)
931MeV=1amu
Fnet=ma


16. Formula for energy levels within any atom?

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17. Magnification equation
EMFavg. induced= -?Fb/ ?t (= - change in mag flux/change in time)
1.6*10?¹? C
M= -di/do (=-hi/ho)
?V2/?V1= N2/N1 (if secondary greater than primary it's a step-up transformer).


18. Mass defect explanation

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19. Sign of focus for concave lens?
Threshold frequency=F/h (= work functions/planck's constant)
M= -di/do (=-hi/ho)
Eff= 1- Qc/Qh = 1- Tc/Th
Positive - focus in front of the lens (=real image)


20. Threshold frequency explanation?
E= kq/r² (= f/q)
6.6310 ?³4 Js
Minimum frequency that needs to illuminate a metal surface for photoELECTRONS to be emitted
Vfinal= V0 +at


21. Total KE formula
Beat frequency= |F1-F2|
Energy it takes to break a nucleus into separate protons and neutrons (same as energy lost to create atom.)
V=IR
Etotal= E rest + KE= mc² + (Y-1)mc²


22. Kinetic Energy formula
EMFavg. induced= -?Fb/ ?t (= - change in mag flux/change in time)
KE=1/2mv²
I=mr²
?Tstationary= Y (?Tmoving)


23. Correction factor for wavelength in a diffraction experiment (probably don't have to know)
?= 4L + 1.6d
S= 1/2at² + v0t+ d0 (intial distance is often ignored because we decide where we want to start)
?V2/?V1= N2/N1 (if secondary greater than primary it's a step-up transformer).
931MeV=1amu


24. deBrolglie wavelength formula

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25. High frequency wave shave...
Q=m*L (where L is the latent heat of fusion or vaporization)
1.6*10?¹? C
Shorter ? - less diffraction - bigger shadow.
6.6310 ?³4 Js


26. (Full) Displacement formula
Ni sin?i=nrsin?r
For every action there is an equal and opposite reaction
?V2/?V1= N2/N1 (if secondary greater than primary it's a step-up transformer).
S= 1/2at² + v0t+ d0 (intial distance is often ignored because we decide where we want to start)


27. Gravitational constant
PV/nT'= p'V'n'T' (p=pressure - V= VOLUME - T= temperature)
G= 6.67 * 10?¹¹ Nm²/kg²
?Tstationary= Y (?Tmoving)
Fingers= Magnetic Field - Thumb=Velocity - Palm of hand= Force. RH=Proton - LH= electron.


28. Work function F is..?
Zero.
Minimal energy that needs to be imparted to an electron on metal surface in order to liberate it.
KE= (Y-1)mc² (= (Y-1)E)
W=qVoltage. (think C* J/C and C's cancel out)


29. Formula for magnetic flux?
Energy it takes to break a nucleus into separate protons and neutrons (same as energy lost to create atom.)
F=mv²/ r
Fb= Bperp-to-areaAcos? (Measures density of magnetic field lines that cross through an area)
Minimal energy that needs to be imparted to an electron on metal surface in order to liberate it.


30. What is the apparent weight of a floating object?
1.6*10?¹? C
Threshold frequency=F/h (= work functions/planck's constant)
Zero.
Minimal energy that needs to be imparted to an electron on metal surface in order to liberate it.


31. Moment of Inertia (a.k.a. rotational mass)
Law of inertia. Object in motion stays in motion unless acted upon by an outside force.
Minimum frequency that needs to illuminate a metal surface for photoELECTRONS to be emitted
I=mr²
Large/high


32. Transformer formula

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33. Magnetic force formula (for wire)?
Neutron --> Proton + electron ( + electron-antineutrino - V with line over it) ( °?1e produced)
W=(Force parallel)(distance)= Pressure ? V (change in volume)= qvoltage
F=ILBsin? (?= angle btw. L and B)
Particles in motion can display wave characteristics - and behave as if they had wavelength (?= h/p)


34. Heat formula
Low
Q=mc?T (where T is temperature)
F=mv²/ r
Torque=force perpendicular to radius r = fr Toruqe=Ia = inertia * angular acceleration


35. Power formula?
The release of electrons due to bombardment of an atom by photons (groups of quanta/bundles of matter)
P=IV=I²R=V² /R = Fd/t= Force*velocity
W= - kq1q2 (1/r2 - 1/r1)
Vfinal= V0 +at


36. Newton's third law
4.14 10?¹5 eVs
Fingers= Magnetic Field - Thumb=Velocity - Palm of hand= Force. RH=Proton - LH= electron.
Fb= Bperp-to-areaAcos? (Measures density of magnetic field lines that cross through an area)
For every action there is an equal and opposite reaction


37. Formula for how velocity changes in air? (probably don't have to know)
Neutron --> Proton + electron ( + electron-antineutrino - V with line over it) ( °?1e produced)
Length stationary=Length moving/Y
Induced current will flow opposite direction of magnetic flux.
V= 331 m/s + (.6 m/s°C)Temperature


38. Electric force formula? (two)
6.6310 ?³4 Js
Felec=qE=[kq1q2]/r²
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)


39. Efficiency of an engine formula
?V2/?V1= N2/N1 (if secondary greater than primary it's a step-up transformer).
Eff= 1- Qc/Qh = 1- Tc/Th
Vfinal²=V0²+ 2ad
Momentum is always conserved in the absence of an outside force


40. Binding 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)
Ebinding= ?m * c² (= (?m)c²)
The volume of the object.
I=mr²


41. New/old gas formula?

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42. How to find total magnification?

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43. If you drop an object into water the volume displaced equals...
EMFavg. induced= -?Fb/ ?t (= - change in mag flux/change in time)
Angle of incidence=Angle of reflection
The volume of the object.
Particles in motion can display wave characteristics - and behave as if they had wavelength (?= h/p)


44. mass of a proton/neutron (there's a slight difference but ignore it - neutron has slightly more mass)
1.67*10?²7kg
1/f= 1/di + 1/do
Fb= mass of displaced fluid * gravity
Fingers= Magnetic Field - Thumb=Velocity - Palm of hand= Force. RH=Proton - LH= electron.


45. Planck's constant in electronvolts* seconds?
F= n * vel./ 4L n= 1 - 3 - 5.... (L= length of pipe) (?=4L/n)
Longer ? - larger diffraction - smaller shadow.
4.14 10?¹5 eVs
Minimal energy that needs to be imparted to an electron on metal surface in order to liberate it.


46. If speed is high - index of refraction is....
Fnet=ma
W= - kq1q2 (1/r2 - 1/r1)
Low
Positive - focus in front of the lens (=real image)


47. Centripetal force formula
PE=mgh
F=mv²/ r
1.67*10?²7kg
PV/nT'= p'V'n'T' (p=pressure - V= VOLUME - T= temperature)


48. Magnetic force formula (for particle)?
C= 3*108 m/s
Positive - focus in front of the lens (=real image)
E=hf (= Planck's constant*frequency)
Force magnetic= |q|vBsin? (=qVperpendicularB) (?= angle between v and B)


49. Law of refraction
P=mv (?p=m?v)
Intensity a Amplitude/ d²
Ni sin?i=nrsin?r
Minimum frequency that needs to illuminate a metal surface for photoELECTRONS to be emitted


50. Graviational force formula
F=GM1M2/r²
Voltage=PE/q (remember Joules/Coulomb= volt)
1.6*10?¹? C
Etotal= E rest + KE= mc² + (Y-1)mc²