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. Voltage formula (for circuit - etc.)
?V2/?V1= N2/N1 (if secondary greater than primary it's a step-up transformer).
EMFavg. induced= -?Fb/ ?t (= - change in mag flux/change in time)
V=IR
Low


2. Sign of focus for convex lens?
KE=1/2mv²
KE= (Y-1)mc² (= (Y-1)E)
F=ILBsin? (?= angle btw. L and B)
Negative - focus behind the lens (= virtual image)


3. magnitude of charge on electron/proton
Law of inertia. Object in motion stays in motion unless acted upon by an outside force.
W= - kq1q2 (1/r2 - 1/r1)
1.6*10?¹? C
Product of each lens's magnification


4. Ideal gas law
Large/high
W=(Force parallel)(distance)= Pressure ? V (change in volume)= qvoltage
PV=nRT (p= pressure - V= volume - n= number of moles - T= temperature in KELVIN - R= .0821)
E= kq/r² (= f/q)


5. Magnetic force formula (for wire)?
F=ILBsin? (?= angle btw. L and B)
?=h/p (where p= MOMENTUM=m?v - and h is planck's constant)
Length stationary=Length moving/Y
Fb= Bperp-to-areaAcos? (Measures density of magnetic field lines that cross through an area)


6. speed of light
C= 3*108 m/s
Ebinding= ?m * c² (= (?m)c²)
M= -di/do (=-hi/ho)
?Tstationary= Y (?Tmoving)


7. New/old gas formula?

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8. Kinetic Energy formula
KE=1/2mv²
Apparent weight = Fb- weight= (mfg) - (m0g) = (mass of displaced fluid gravity) - (initial mass of object while hanging in air gravity) = (DfVfg)- (DoVog)
Felec=qE=[kq1q2]/r²
V= 331 m/s + (.6 m/s°C)Temperature


9. Heat of fusion/vaporization fromula
S= 1/2at² + v0t+ d0 (intial distance is often ignored because we decide where we want to start)
Q=m*L (where L is the latent heat of fusion or vaporization)
C= 3*108 m/s
Zero.


10. mass of a proton/neutron (there's a slight difference but ignore it - neutron has slightly more mass)
A= A0 e ^ [-?t] (= activity at time t=0 e ^ ( - decay constant * time)
1.67*10?²7kg
E= kq/r² (= f/q)
K= 9 * 10? Nm²/C²


11. Converting Fahrenheit to Celsius
931MeV=1amu
F= (9/5)C+ 32
PV/nT'= p'V'n'T' (p=pressure - V= VOLUME - T= temperature)
1/f= 1/di + 1/do


12. Binding energy formula
For every action there is an equal and opposite reaction
KEmax= hf-F (= E-F= Energy of a photon - work function)
Ebinding= ?m * c² (= (?m)c²)
EMFavg. induced= -?Fb/ ?t (= - change in mag flux/change in time)


13. Formula for electric field?
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)
E0= 8.85 * 10?¹² C²/(Nm²)
E= kq/r² (= f/q)
PV/nT'= p'V'n'T' (p=pressure - V= VOLUME - T= temperature)


14. Newton's third law
F=mv²/ r
G= 6.67 * 10?¹¹ Nm²/kg²
Product of each lens's magnification
For every action there is an equal and opposite reaction


15. Impulse formula
Particles in motion can display wave characteristics - and behave as if they had wavelength (?= h/p)
C= Q/V = e0 *A/d
Intensity a Amplitude/ d²
?p=f?t (where f is AVERAGE force and t is how long force is applied)


16. Activity of a radioactive sample formula? (probably don't have to know)
Shorter ? - less diffraction - bigger shadow.
A= A0 e ^ [-?t] (= activity at time t=0 e ^ ( - decay constant * time)
Threshold frequency=F/h (= work functions/planck's constant)
C= 3*108 m/s


17. (Full/Final) Velocity formula
S= 1/2at² + v0t+ d0 (intial distance is often ignored because we decide where we want to start)
Q=mc?T (where T is temperature)
Torque=force perpendicular to radius r = fr Toruqe=Ia = inertia * angular acceleration
Vfinal= V0 +at


18. Law of refraction
Neutron --> Proton + electron ( + electron-antineutrino - V with line over it) ( °?1e produced)
Law of inertia. Object in motion stays in motion unless acted upon by an outside force.
Ni sin?i=nrsin?r
C= 3*108 m/s


19. Faraday's law
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)
EMFavg. induced= -?Fb/ ?t (= - change in mag flux/change in time)
Distance= velocity * time
Particles in motion can display wave characteristics - and behave as if they had wavelength (?= h/p)


20. Energy of an emitted photon formula?
?V2/?V1= N2/N1 (if secondary greater than primary it's a step-up transformer).
Fb= mass of displaced fluid * gravity
Zero.
Energy of emitted photon = E2-E1 (=Energy level higher- Energy level lower)


21. Velocity formula if time not given
PEspring= 1/2 kx² (K is spring constant - X is distance spring compressed)
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)
Atom + electron--> Neutron (the addition of an electron - °?1e - causes a proton to change into a neutron - i.e. PROTON TRANSFORMS)


22. Law of reflection
G= 6.67 * 10?¹¹ Nm²/kg²
Angle of incidence=Angle of reflection
E=hf (= Planck's constant*frequency)
K= 9 * 10? Nm²/C²


23. Correction factor for wavelength in a diffraction experiment (probably don't have to know)
4.14 10?¹5 eVs
?= 4L + 1.6d
?IE= - W (work)
E= V/d


24. Centripetal force formula
Particles in motion can display wave characteristics - and behave as if they had wavelength (?= h/p)
F= n * vel./ 4L n= 1 - 3 - 5.... (L= length of pipe) (?=4L/n)
Law of inertia. Object in motion stays in motion unless acted upon by an outside force.
F=mv²/ r


25. Formula for electric potential energy?
The release of electrons due to bombardment of an atom by photons (groups of quanta/bundles of matter)
PE= 1/2 C (?V)² = 1/2 Q²/C = 1/2 Q?V
Vfinal²=V0²+ 2ad
?= 4L + 1.6d


26. If you drop an object into water the volume displaced equals...
Force magnetic= |q|vBsin? (=qVperpendicularB) (?= angle between v and B)
The volume of the object.
F= n * vel/2L n= 1 - 2 - 3... (L= length of pipe) (?=2L/n)
Felec=qE=[kq1q2]/r²


27. Index of refraction formula
Momentum is always conserved in the absence of an outside force
N= C/velocity.
1/f= 1/di + 1/do
Q=mc?T (where T is temperature)


28. Moment of Inertia (a.k.a. rotational mass)
Minimal energy that needs to be imparted to an electron on metal surface in order to liberate it.
931MeV=1amu
I=mr²
Proton--> Neutron + positron (+ electron-neutrino - v) (° +1 e is produced)


29. Planck's constant in electronvolts* seconds?
Zero.
4.14 10?¹5 eVs
C= 3*108 m/s
Etotal= E rest + KE= mc² + (Y-1)mc²


30. Momentum formula?
V=IR
F=mv²/ r
P=mv (?p=m?v)
Vfinal²=V0²+ 2ad


31. Formula for diffraction pattern - Anti-node to Anti-node (A-A)
Induced current will flow opposite direction of magnetic flux.
The volume of the object.
EMFavg. induced= -?Fb/ ?t (= - change in mag flux/change in time)
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)


32. Sign of focus for concave lens?
Q=m*L (where L is the latent heat of fusion or vaporization)
Positive - focus in front of the lens (=real image)
K= 9 * 10? Nm²/C²
Ni sin?i=nrsin?r


33. Maximum KE with which an emitted electron leaves is...?
The release of electrons due to bombardment of an atom by photons (groups of quanta/bundles of matter)
1.67*10?²7kg
KEmax= hf-F (= E-F= Energy of a photon - work function)
PE=mgh


34. Transformer formula

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35. Electron capture
Q= [(mass of A + mass of B) - (mass of C + mass of D)] c² (where A+B-->C+D)
Atom + electron--> Neutron (the addition of an electron - °?1e - causes a proton to change into a neutron - i.e. PROTON TRANSFORMS)
The release of electrons due to bombardment of an atom by photons (groups of quanta/bundles of matter)
Beat frequency= |F1-F2|


36. deBrolglie wavelength formula

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37. Formula for diffraction pattern - Anti-node to node (A-N)
N= C/velocity.
(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)
Longer ? - larger diffraction - smaller shadow.
Distance= velocity * time


38. ONE END CAPPED PIPE FREQUENCY (Frequency/Harmonic series of a pipe closed at one ned)
KE= (Y-1)mc² (= (Y-1)E)
F= n * vel./ 4L n= 1 - 3 - 5.... (L= length of pipe) (?=4L/n)
Energy it takes to break a nucleus into separate protons and neutrons (same as energy lost to create atom.)
(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)


39. Mass defect explanation

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40. Formula for resistance of an OBJECT
A=v²/ r
R= ?L/A = (resistivity)(length of wire) / (cross sectional Area)
6.6310 ?³4 Js
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)


41. What is the apparent weight of a floating object?
Intensity a Amplitude/ d²
Particles in motion can display wave characteristics - and behave as if they had wavelength (?= h/p)
Zero.
Felec=qE=[kq1q2]/r²


42. Formula for energy levels within any atom?

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43. Apparent weight (weight of submerged object)
E0= 8.85 * 10?¹² C²/(Nm²)
Apparent weight = Fb- weight= (mfg) - (m0g) = (mass of displaced fluid gravity) - (initial mass of object while hanging in air gravity) = (DfVfg)- (DoVog)
(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.


44. Electric field between two plates formula?
Fb= Bperp-to-areaAcos? (Measures density of magnetic field lines that cross through an area)
Vfinal= V0 +at
E= V/d
A= A0 e ^ [-?t] (= activity at time t=0 e ^ ( - decay constant * time)


45. Right-hand rule
Length stationary=Length moving/Y
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)
Fb= mass of displaced fluid * gravity


46. Low frequency waves have...
Longer ? - larger diffraction - smaller shadow.
Voltage=PE/q (remember Joules/Coulomb= volt)
?V2/?V1= N2/N1 (if secondary greater than primary it's a step-up transformer).
Q=mc?T (where T is temperature)


47. Newton's first law (Law of...)
R= ?L/A = (resistivity)(length of wire) / (cross sectional Area)
Law of inertia. Object in motion stays in motion unless acted upon by an outside force.
Negative - focus behind the lens (= virtual image)
KEmax= hf-F (= E-F= Energy of a photon - work function)


48. Work performed by charge displacement? (hopefully...won't have to know)
The release of electrons due to bombardment of an atom by photons (groups of quanta/bundles of matter)
Felec=qE=[kq1q2]/r²
W= - kq1q2 (1/r2 - 1/r1)
Ebinding= ?m * c² (= (?m)c²)


49. ß? decay?
931MeV=1amu
?V2/?V1= N2/N1 (if secondary greater than primary it's a step-up transformer).
K= 9 * 10? Nm²/C²
Neutron --> Proton + electron ( + electron-antineutrino - V with line over it) ( °?1e produced)


50. Light intensity is proportional to..
A= A0 e ^ [-?t] (= activity at time t=0 e ^ ( - decay constant * time)
Intensity a Amplitude/ d²
The release of electrons due to bombardment of an atom by photons (groups of quanta/bundles of matter)
1/f= 1/di + 1/do