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. Efficiency of an engine formula
Eff= 1- Qc/Qh = 1- Tc/Th
Product of each lens's magnification
S= 1/2at² + v0t+ d0 (intial distance is often ignored because we decide where we want to start)
P=IV=I²R=V² /R = Fd/t= Force*velocity


2. speed of light
C= 3*108 m/s
F=mv²/ r
Fb= Bperp-to-areaAcos? (Measures density of magnetic field lines that cross through an area)
Momentum is always conserved in the absence of an outside force


3. Ideal gas law
The incident angle at which total internal reflection occurs (use ?r=90°)
PV=nRT (p= pressure - V= volume - n= number of moles - T= temperature in KELVIN - R= .0821)
Q=m*L (where L is the latent heat of fusion or vaporization)
Length stationary=Length moving/Y


4. Power formula?
KE=1/2mv²
Y= 1/ v(1-(v/c)²)
Large/high
P=IV=I²R=V² /R = Fd/t= Force*velocity


5. deBroglie wavelength explanation
?= 4L + 1.6d
Particles in motion can display wave characteristics - and behave as if they had wavelength (?= h/p)
C= Q/V = e0 *A/d
Voltage=PE/q (remember Joules/Coulomb= volt)


6. Formula for electric potential energy?
Proton--> Neutron + positron (+ electron-neutrino - v) (° +1 e is produced)
PE= 1/2 C (?V)² = 1/2 Q²/C = 1/2 Q?V
Momentum is always conserved in the absence of an outside force
For every action there is an equal and opposite reaction


7. Formula for how velocity changes in air? (probably don't have to know)
Law of inertia. Object in motion stays in motion unless acted upon by an outside force.
The release of electrons due to bombardment of an atom by photons (groups of quanta/bundles of matter)
V= 331 m/s + (.6 m/s°C)Temperature
Low


8. Converting Fahrenheit to Celsius
Induced current will flow opposite direction of magnetic flux.
E= kq/r² (= f/q)
P=IV=I²R=V² /R = Fd/t= Force*velocity
F= (9/5)C+ 32


9. Relativistic formula for velocity
C= 3*108 m/s
E=hf (= Planck's constant*frequency)
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)


10. Elastic potential energy for a spring formula
The incident angle at which total internal reflection occurs (use ?r=90°)
Low
PEspring= 1/2 kx² (K is spring constant - X is distance spring compressed)
?= 4L + 1.6d


11. Electron capture
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)
Fb= Bperp-to-areaAcos? (Measures density of magnetic field lines that cross through an area)
PV/nT'= p'V'n'T' (p=pressure - V= VOLUME - T= temperature)


12. Threshold frequency formula?

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13. ß? decay?
V=f?
Neutron --> Proton + electron ( + electron-antineutrino - V with line over it) ( °?1e produced)
PE= 1/2 C (?V)² = 1/2 Q²/C = 1/2 Q?V
Threshold frequency=F/h (= work functions/planck's constant)


14. Work (only in terms of charge and voltage) formula

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15. Distance formula?
E0= 8.85 * 10?¹² C²/(Nm²)
Distance= velocity * time
Angle of incidence=Angle of reflection
A=v²/ r


16. Transformer formula

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17. Beat frequency
Energy it takes to break a nucleus into separate protons and neutrons (same as energy lost to create atom.)
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)
Beat frequency= |F1-F2|
The incident angle at which total internal reflection occurs (use ?r=90°)


18. Binding energy explanation
Energy it takes to break a nucleus into separate protons and neutrons (same as energy lost to create atom.)
V= 331 m/s + (.6 m/s°C)Temperature
The release of electrons due to bombardment of an atom by photons (groups of quanta/bundles of matter)
Felec=qE=[kq1q2]/r²


19. magnitude of charge on electron/proton
Etotal= E rest + KE= mc² + (Y-1)mc²
1.6*10?¹? C
?V2/?V1= N2/N1 (if secondary greater than primary it's a step-up transformer).
F= n * vel./ 4L n= 1 - 3 - 5.... (L= length of pipe) (?=4L/n)


20. Work performed by charge displacement? (hopefully...won't have to know)
4.14 10?¹5 eVs
PE= 1/2 C (?V)² = 1/2 Q²/C = 1/2 Q?V
W= - kq1q2 (1/r2 - 1/r1)
Etotal= E rest + KE= mc² + (Y-1)mc²


21. Planck's constant in J*s?
Shorter ? - less diffraction - bigger shadow.
KE=1/2mv²
P=IV=I²R=V² /R = Fd/t= Force*velocity
6.6310 ?³4 Js


22. Capacitance constant
Q=mc?T (where T is temperature)
The release of electrons due to bombardment of an atom by photons (groups of quanta/bundles of matter)
N= C/velocity.
E0= 8.85 * 10?¹² C²/(Nm²)


23. Moment of Inertia (a.k.a. rotational mass)
PE=mgh
I=mr²
Vfinal= V0 +at
Torque=force perpendicular to radius r = fr Toruqe=Ia = inertia * angular acceleration


24. Threshold frequency explanation?
Minimum frequency that needs to illuminate a metal surface for photoELECTRONS to be emitted
PV=nRT (p= pressure - V= volume - n= number of moles - T= temperature in KELVIN - R= .0821)
Q=mc?T (where T is temperature)
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)


25. If speed is slow/low - index of refraction is...
EMFavg. induced= -?Fb/ ?t (= - change in mag flux/change in time)
A=v²/ r
Large/high
PE=mgh


26. High frequency wave shave...
Fingers= Magnetic Field - Thumb=Velocity - Palm of hand= Force. RH=Proton - LH= electron.
Torque=force perpendicular to radius r = fr Toruqe=Ia = inertia * angular acceleration
Energy it takes to break a nucleus into separate protons and neutrons (same as energy lost to create atom.)
Shorter ? - less diffraction - bigger shadow.


27. Formula for velocity of waves?
The incident angle at which total internal reflection occurs (use ?r=90°)
?IE= - W (work)
M= -di/do (=-hi/ho)
V=f?


28. Electric force formula? (two)
Q=m*L (where L is the latent heat of fusion or vaporization)
?Tstationary= Y (?Tmoving)
Felec=qE=[kq1q2]/r²
Energy of emitted photon = E2-E1 (=Energy level higher- Energy level lower)


29. Centripetal acceleration formula
The incident angle at which total internal reflection occurs (use ?r=90°)
Momentum is always conserved in the absence of an outside force
A=v²/ r
Minimal energy that needs to be imparted to an electron on metal surface in order to liberate it.


30. Work formula
W=(Force parallel)(distance)= Pressure ? V (change in volume)= qvoltage
Apparent weight = Fb- weight= (mfg) - (m0g) = (mass of displaced fluid gravity) - (initial mass of object while hanging in air gravity) = (DfVfg)- (DoVog)
KE=1/2mv²
Ni sin?i=nrsin?r


31. Voltage formula (for circuit - etc.)
V=IR
?p=f?t (where f is AVERAGE force and t is how long force is applied)
EMFavg. induced= -?Fb/ ?t (= - change in mag flux/change in time)
PE= 1/2 C (?V)² = 1/2 Q²/C = 1/2 Q?V


32. Kinetic Energy formula
A= A0 e ^ [-?t] (= activity at time t=0 e ^ ( - decay constant * time)
Ebinding= ?m * c² (= (?m)c²)
KE=1/2mv²
Y= 1/ v(1-(v/c)²)


33. Centripetal force formula
Angle of incidence=Angle of reflection
F=mv²/ r
For every action there is an equal and opposite reaction
The volume of the object.


34. Right-hand rule
Atom + electron--> Neutron (the addition of an electron - °?1e - causes a proton to change into a neutron - i.e. PROTON TRANSFORMS)
The volume of the object.
V=f?
Fingers= Magnetic Field - Thumb=Velocity - Palm of hand= Force. RH=Proton - LH= electron.


35. New/old gas formula?

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36. Internal energy....equals?
N= C/velocity.
KEmax= hf-F (= E-F= Energy of a photon - work function)
?IE= - W (work)
F= n * vel./ 4L n= 1 - 3 - 5.... (L= length of pipe) (?=4L/n)


37. Faraday's law
Longer ? - larger diffraction - smaller shadow.
EMFavg. induced= -?Fb/ ?t (= - change in mag flux/change in time)
Law of inertia. Object in motion stays in motion unless acted upon by an outside force.
Beat frequency= |F1-F2|


38. Newton's third law
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
F= (9/5)C+ 32
Neutron --> Proton + electron ( + electron-antineutrino - V with line over it) ( °?1e produced)


39. What is the apparent weight of a floating object?
1.6*10?¹? C
Zero.
F= (9/5)C+ 32
?V2/?V1= N2/N1 (if secondary greater than primary it's a step-up transformer).


40. Low frequency waves have...
1.6*10?¹? C
Length stationary=Length moving/Y
Longer ? - larger diffraction - smaller shadow.
931MeV=1amu


41. Conversion factor from atomic mass units to MeV?
931MeV=1amu
Voltage=PE/q (remember Joules/Coulomb= volt)
F= n * vel./ 4L n= 1 - 3 - 5.... (L= length of pipe) (?=4L/n)
E=hf (= Planck's constant*frequency)


42. Work function F is..?
Energy it takes to break a nucleus into separate protons and neutrons (same as energy lost to create atom.)
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)
Law of inertia. Object in motion stays in motion unless acted upon by an outside force.
Minimal energy that needs to be imparted to an electron on metal surface in order to liberate it.


43. Sign of focus for convex lens?
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)
Product of each lens's magnification
Negative - focus behind the lens (= virtual image)
Energy of emitted photon = E2-E1 (=Energy level higher- Energy level lower)


44. Torque formula
Q=mc?T (where T is temperature)
V= 331 m/s + (.6 m/s°C)Temperature
Proton--> Neutron + positron (+ electron-neutrino - v) (° +1 e is produced)
Torque=force perpendicular to radius r = fr Toruqe=Ia = inertia * angular acceleration


45. Formula for energy of a photon?

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46. Mass defect explanation

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47. Capacitance formula? (there are two)
P=IV=I²R=V² /R = Fd/t= Force*velocity
C= Q/V = e0 *A/d
V=IR
Torque=force perpendicular to radius r = fr Toruqe=Ia = inertia * angular acceleration


48. Formula for electric field?
The volume of the object.
F= n * vel/2L n= 1 - 2 - 3... (L= length of pipe) (?=2L/n)
E= kq/r² (= f/q)
I=mr²


49. How to find total magnification?

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50. Newton's second law
Fnet=ma
Energy of emitted photon = E2-E1 (=Energy level higher- Energy level lower)
V=IR
N= C/velocity.