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. OPEN PIPE FREQUENCY (Frequency/Harmonic series of a pipe opened at both ends)
F= n * vel/2L n= 1 - 2 - 3... (L= length of pipe) (?=2L/n)
?= 4L + 1.6d
Torque=force perpendicular to radius r = fr Toruqe=Ia = inertia * angular acceleration
Zero.


2. What is the apparent weight of a floating object?
KE=1/2mv²
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)
Etotal= E rest + KE= mc² + (Y-1)mc²
Zero.


3. Moment of Inertia (a.k.a. rotational mass)
Force magnetic= |q|vBsin? (=qVperpendicularB) (?= angle between v and B)
P=IV=I²R=V² /R = Fd/t= Force*velocity
I=mr²
Negative - focus behind the lens (= virtual image)


4. Heat of fusion/vaporization fromula
PE=mgh
W=(Force parallel)(distance)= Pressure ? V (change in volume)= qvoltage
Q=m*L (where L is the latent heat of fusion or vaporization)
E= V/d


5. Mass defect explanation

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6. Planck's constant in J*s?
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)
KE= (Y-1)mc² (= (Y-1)E)
6.6310 ?³4 Js
931MeV=1amu


7. Capacitance constant
PV=nRT (p= pressure - V= volume - n= number of moles - T= temperature in KELVIN - R= .0821)
E0= 8.85 * 10?¹² C²/(Nm²)
G= 6.67 * 10?¹¹ Nm²/kg²
?=h/p (where p= MOMENTUM=m?v - and h is planck's constant)


8. Relativistic formula for (kinetic) energy
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.)
KE= (Y-1)mc² (= (Y-1)E)
A= A0 e ^ [-?t] (= activity at time t=0 e ^ ( - decay constant * time)


9. deBrolglie wavelength formula

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10. Threshold frequency formula?

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11. Lenz's law
EMFavg. induced= -?Fb/ ?t (= - change in mag flux/change in time)
Low
Induced current will flow opposite direction of magnetic flux.
E=hf (= Planck's constant*frequency)


12. Voltage formula (for circuit - etc.)
Momentum is always conserved in the absence of an outside force
The incident angle at which total internal reflection occurs (use ?r=90°)
PE=mgh
V=IR


13. ß? decay?
Eff= 1- Qc/Qh = 1- Tc/Th
V=IR
N= C/velocity.
Proton--> Neutron + positron (+ electron-neutrino - v) (° +1 e is produced)


14. Formula for velocity of waves?
V=f?
KE= (Y-1)mc² (= (Y-1)E)
F=ILBsin? (?= angle btw. L and B)
6.6310 ?³4 Js


15. Right-hand rule
Force magnetic= |q|vBsin? (=qVperpendicularB) (?= angle between v and B)
E=hf (= Planck's constant*frequency)
Fingers= Magnetic Field - Thumb=Velocity - Palm of hand= Force. RH=Proton - LH= electron.
G= 6.67 * 10?¹¹ Nm²/kg²


16. Electron capture
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)
Atom + electron--> Neutron (the addition of an electron - °?1e - causes a proton to change into a neutron - i.e. PROTON TRANSFORMS)
?= 4L + 1.6d
Q=m*L (where L is the latent heat of fusion or vaporization)


17. If you drop an object into water the volume displaced equals...
The volume of the object.
C= 3*108 m/s
A= A0 e ^ [-?t] (= activity at time t=0 e ^ ( - decay constant * time)
Ni sin?i=nrsin?r


18. ß? decay?
PV=nRT (p= pressure - V= volume - n= number of moles - T= temperature in KELVIN - R= .0821)
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)
Neutron --> Proton + electron ( + electron-antineutrino - V with line over it) ( °?1e produced)
F= (9/5)C+ 32


19. Relativistic factor Y formula
Fingers= Magnetic Field - Thumb=Velocity - Palm of hand= Force. RH=Proton - LH= electron.
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)
Y= 1/ v(1-(v/c)²)


20. Maximum KE with which an emitted electron leaves is...?
E=hf (= Planck's constant*frequency)
Law of inertia. Object in motion stays in motion unless acted upon by an outside force.
Ni sin?i=nrsin?r
KEmax= hf-F (= E-F= Energy of a photon - work function)


21. Relativistic formula for velocity
Law of inertia. Object in motion stays in motion unless acted upon by an outside force.
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)
V=f?
Proton--> Neutron + positron (+ electron-neutrino - v) (° +1 e is produced)


22. Newton's third law
Proton--> Neutron + positron (+ electron-neutrino - v) (° +1 e is produced)
Intensity a Amplitude/ d²
Torque=force perpendicular to radius r = fr Toruqe=Ia = inertia * angular acceleration
For every action there is an equal and opposite reaction


23. Impulse formula
?p=f?t (where f is AVERAGE force and t is how long force is applied)
Distance= velocity * time
A= A0 e ^ [-?t] (= activity at time t=0 e ^ ( - decay constant * time)
Angle of incidence=Angle of reflection


24. What is the photoelectric effect?
1.6*10?¹? C
F=mv²/ r
The release of electrons due to bombardment of an atom by photons (groups of quanta/bundles of matter)
A=v²/ r


25. Conversion factor from atomic mass units to MeV?
?=h/p (where p= MOMENTUM=m?v - and h is planck's constant)
Q=m*L (where L is the latent heat of fusion or vaporization)
Eff= 1- Qc/Qh = 1- Tc/Th
931MeV=1amu


26. How to find total magnification?

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27. Formula for diffraction pattern - Anti-node to Anti-node (A-A)
PV=nRT (p= pressure - V= volume - n= number of moles - T= temperature in KELVIN - R= .0821)
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)
P=IV=I²R=V² /R = Fd/t= Force*velocity
PE= 1/2 C (?V)² = 1/2 Q²/C = 1/2 Q?V


28. Formula for electric potential energy?
Zero.
Low
1.67*10?²7kg
PE= 1/2 C (?V)² = 1/2 Q²/C = 1/2 Q?V


29. Centripetal acceleration formula
V=IR
Induced current will flow opposite direction of magnetic flux.
M= -di/do (=-hi/ho)
A=v²/ r


30. Binding energy formula
V=f?
Zero.
Ebinding= ?m * c² (= (?m)c²)
Low


31. Centripetal force formula
F=mv²/ r
C= 3*108 m/s
Vfinal²=V0²+ 2ad
KE= (Y-1)mc² (= (Y-1)E)


32. Activity of a radioactive sample formula? (probably don't have to know)
Neutron --> Proton + electron ( + electron-antineutrino - V with line over it) ( °?1e produced)
Fb= Bperp-to-areaAcos? (Measures density of magnetic field lines that cross through an area)
A= A0 e ^ [-?t] (= activity at time t=0 e ^ ( - decay constant * time)
Intensity a Amplitude/ d²


33. Transformer formula

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34. Gravitational constant
V=f?
Proton--> Neutron + positron (+ electron-neutrino - v) (° +1 e is produced)
G= 6.67 * 10?¹¹ Nm²/kg²
Fnet=ma


35. magnitude of charge on electron/proton
Force magnetic= |q|vBsin? (=qVperpendicularB) (?= angle between v and B)
M= -di/do (=-hi/ho)
Apparent weight = Fb- weight= (mfg) - (m0g) = (mass of displaced fluid gravity) - (initial mass of object while hanging in air gravity) = (DfVfg)- (DoVog)
1.6*10?¹? C


36. 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)
Shorter ? - less diffraction - bigger shadow.
V=f?


37. Law of reflection
Vfinal= V0 +at
Angle of incidence=Angle of reflection
Minimum frequency that needs to illuminate a metal surface for photoELECTRONS to be emitted
E=hf (= Planck's constant*frequency)


38. Sign of focus for concave lens?
Positive - focus in front of the lens (=real image)
Etotal= E rest + KE= mc² + (Y-1)mc²
Fb= mass of displaced fluid * gravity
W=(Force parallel)(distance)= Pressure ? V (change in volume)= qvoltage


39. Graviational force formula
Minimum frequency that needs to illuminate a metal surface for photoELECTRONS to be emitted
F=GM1M2/r²
KE= (Y-1)mc² (= (Y-1)E)
Law of inertia. Object in motion stays in motion unless acted upon by an outside force.


40. Ideal gas law
Fb= Bperp-to-areaAcos? (Measures density of magnetic field lines that cross through an area)
W=qVoltage. (think C* J/C and C's cancel out)
PV=nRT (p= pressure - V= volume - n= number of moles - T= temperature in KELVIN - R= .0821)
?p=f?t (where f is AVERAGE force and t is how long force is applied)


41. Low frequency waves have...
F= (9/5)C+ 32
F=GM1M2/r²
F=mv²/ r
Longer ? - larger diffraction - smaller shadow.


42. Efficiency of an engine formula
4.14 10?¹5 eVs
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)
Eff= 1- Qc/Qh = 1- Tc/Th


43. Light intensity is proportional to..
C= Q/V = e0 *A/d
Minimal energy that needs to be imparted to an electron on metal surface in order to liberate it.
Intensity a Amplitude/ d²
V=IR


44. Work formula
F=ILBsin? (?= angle btw. L and B)
W=(Force parallel)(distance)= Pressure ? V (change in volume)= qvoltage
P=IV=I²R=V² /R = Fd/t= Force*velocity
F= (9/5)C+ 32


45. Formula for diffraction pattern - Anti-node to node (A-N)
W=qVoltage. (think C* J/C and C's cancel out)
F= n * vel./ 4L n= 1 - 3 - 5.... (L= length of pipe) (?=4L/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)
S= 1/2at² + v0t+ d0 (intial distance is often ignored because we decide where we want to start)


46. Heat formula
KE=1/2mv²
Q=mc?T (where T is temperature)
Ebinding= ?m * c² (= (?m)c²)
Voltage=PE/q (remember Joules/Coulomb= volt)


47. Internal energy....equals?
Force magnetic= |q|vBsin? (=qVperpendicularB) (?= angle between v and B)
Minimal energy that needs to be imparted to an electron on metal surface in order to liberate it.
?IE= - W (work)
6.6310 ?³4 Js


48. Magnetic force formula (for particle)?
Force magnetic= |q|vBsin? (=qVperpendicularB) (?= angle between v and B)
W=qVoltage. (think C* J/C and C's cancel out)
PEspring= 1/2 kx² (K is spring constant - X is distance spring compressed)
Y= 1/ v(1-(v/c)²)


49. K constant for electric field formula?
F= n * vel./ 4L n= 1 - 3 - 5.... (L= length of pipe) (?=4L/n)
Torque=force perpendicular to radius r = fr Toruqe=Ia = inertia * angular acceleration
K= 9 * 10? Nm²/C²
M= -di/do (=-hi/ho)


50. Formula for how velocity changes in air? (probably don't have to know)
V= 331 m/s + (.6 m/s°C)Temperature
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)
Induced current will flow opposite direction of magnetic flux.
KEmax= hf-F (= E-F= Energy of a photon - work function)