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. ß? decay?
Q=mc?T (where T is temperature)
G= 6.67 * 10?¹¹ Nm²/kg²
Neutron --> Proton + electron ( + electron-antineutrino - V with line over it) ( °?1e produced)
(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)


2. Law of reflection
Angle of incidence=Angle of reflection
C= Q/V = e0 *A/d
EMFavg. induced= -?Fb/ ?t (= - change in mag flux/change in time)
Threshold frequency=F/h (= work functions/planck's constant)


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

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4. deBroglie wavelength explanation
V=IR
V= 331 m/s + (.6 m/s°C)Temperature
Particles in motion can display wave characteristics - and behave as if they had wavelength (?= h/p)
E= kq/r² (= f/q)


5. Low frequency waves have...
Longer ? - larger diffraction - smaller shadow.
Minimum frequency that needs to illuminate a metal surface for photoELECTRONS to be emitted
Particles in motion can display wave characteristics - and behave as if they had wavelength (?= h/p)
En= [Z²/n² * -13.6ev ] (Z is number of protons in atom's nucleus - n is energy level number)


6. Sign of focus for concave lens?
Positive - focus in front of the lens (=real image)
W= - kq1q2 (1/r2 - 1/r1)
F=ILBsin? (?= angle btw. L and B)
The release of electrons due to bombardment of an atom by photons (groups of quanta/bundles of matter)


7. Planck's constant in J*s?
6.6310 ?³4 Js
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)
Positive - focus in front of the lens (=real image)


8. Formula for energy of a photon?

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9. Torque formula
R= ?L/A = (resistivity)(length of wire) / (cross sectional Area)
N= C/velocity.
Torque=force perpendicular to radius r = fr Toruqe=Ia = inertia * angular acceleration
Eff= 1- Qc/Qh = 1- Tc/Th


10. Moment of Inertia (a.k.a. rotational mass)
1.6*10?¹? C
I=mr²
Ebinding= ?m * c² (= (?m)c²)
F= n * vel/2L n= 1 - 2 - 3... (L= length of pipe) (?=2L/n)


11. 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)
R= ?L/A = (resistivity)(length of wire) / (cross sectional Area)
1/f= 1/di + 1/do
Angle of incidence=Angle of reflection


12. Magnification equation
Proton--> Neutron + positron (+ electron-neutrino - v) (° +1 e is produced)
Shorter ? - less diffraction - bigger shadow.
Vfinal²=V0²+ 2ad
M= -di/do (=-hi/ho)


13. Centripetal acceleration formula
E0= 8.85 * 10?¹² C²/(Nm²)
Longer ? - larger diffraction - smaller shadow.
A=v²/ r
G= 6.67 * 10?¹¹ Nm²/kg²


14. K constant for electric field formula?
K= 9 * 10? Nm²/C²
KE= (Y-1)mc² (= (Y-1)E)
6.6310 ?³4 Js
1.6*10?¹? C


15. ß? decay?
Proton--> Neutron + positron (+ electron-neutrino - v) (° +1 e is produced)
KE= (Y-1)mc² (= (Y-1)E)
Positive - focus in front of the lens (=real image)
A=v²/ r


16. New/old gas formula?

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17. If you drop an object into water the volume displaced equals...
Large/high
Distance= velocity * time
The volume of the object.
P=IV=I²R=V² /R = Fd/t= Force*velocity


18. Correction factor for wavelength in a diffraction experiment (probably don't have to know)
?= 4L + 1.6d
Atom + electron--> Neutron (the addition of an electron - °?1e - causes a proton to change into a neutron - i.e. PROTON TRANSFORMS)
KEmax= hf-F (= E-F= Energy of a photon - work function)
V= 331 m/s + (.6 m/s°C)Temperature


19. Impulse formula
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)
1.67*10?²7kg
G= 6.67 * 10?¹¹ Nm²/kg²
?p=f?t (where f is AVERAGE force and t is how long force is applied)


20. Index of refraction formula
Energy it takes to break a nucleus into separate protons and neutrons (same as energy lost to create atom.)
1/f= 1/di + 1/do
The volume of the object.
N= C/velocity.


21. Distance formula?
?= 4L + 1.6d
F=GM1M2/r²
Positive - focus in front of the lens (=real image)
Distance= velocity * time


22. Total KE formula
?=h/p (where p= MOMENTUM=m?v - and h is planck's constant)
V=f?
F= n * vel./ 4L n= 1 - 3 - 5.... (L= length of pipe) (?=4L/n)
Etotal= E rest + KE= mc² + (Y-1)mc²


23. Velocity formula if time not given
KE= (Y-1)mc² (= (Y-1)E)
?V2/?V1= N2/N1 (if secondary greater than primary it's a step-up transformer).
Vfinal²=V0²+ 2ad
V= 331 m/s + (.6 m/s°C)Temperature


24. High frequency wave shave...
Shorter ? - less diffraction - bigger shadow.
Minimum frequency that needs to illuminate a metal surface for photoELECTRONS to be emitted
Momentum is always conserved in the absence of an outside force
Vfinal= V0 +at


25. deBrolglie wavelength formula

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26. Newton's third law
R= ?L/A = (resistivity)(length of wire) / (cross sectional Area)
Ni sin?i=nrsin?r
For every action there is an equal and opposite reaction
Momentum is always conserved in the absence of an outside force


27. If speed is slow/low - index of refraction is...
F=mv²/ r
Large/high
Torque=force perpendicular to radius r = fr Toruqe=Ia = inertia * angular acceleration
A=v²/ r


28. Relativistic formula for length
Positive - focus in front of the lens (=real image)
Length stationary=Length moving/Y
?Tstationary= Y (?Tmoving)
P=mv (?p=m?v)


29. Ideal gas law
A=v²/ r
Particles in motion can display wave characteristics - and behave as if they had wavelength (?= h/p)
PV=nRT (p= pressure - V= volume - n= number of moles - T= temperature in KELVIN - R= .0821)
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)


30. Sign of focus for convex lens?
Negative - focus behind the lens (= virtual image)
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)
E= V/d
The volume of the object.


31. Formula for magnetic flux?
Shorter ? - less diffraction - bigger shadow.
Ni sin?i=nrsin?r
Fb= Bperp-to-areaAcos? (Measures density of magnetic field lines that cross through an area)
Y= 1/ v(1-(v/c)²)


32. Potential Energy formula
E= V/d
Voltage=PE/q (remember Joules/Coulomb= volt)
PE=mgh
P=mv (?p=m?v)


33. Formula for diffraction pattern - Anti-node to node (A-N)
E0= 8.85 * 10?¹² C²/(Nm²)
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)
(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)
1/f= 1/di + 1/do


34. Formula for energy levels within any atom?

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35. Formula for resistance of an OBJECT
PE=mgh
R= ?L/A = (resistivity)(length of wire) / (cross sectional Area)
V=f?
?IE= - W (work)


36. Capacitance constant
Large/high
Momentum is always conserved in the absence of an outside force
E0= 8.85 * 10?¹² C²/(Nm²)
Voltage=PE/q (remember Joules/Coulomb= volt)


37. Formula for electric potential energy?
Momentum is always conserved in the absence of an outside force
PE= 1/2 C (?V)² = 1/2 Q²/C = 1/2 Q?V
E=hf (= Planck's constant*frequency)
Vfinal²=V0²+ 2ad


38. Momentum formula?
P=mv (?p=m?v)
Ebinding= ?m * c² (= (?m)c²)
Q=mc?T (where T is temperature)
F= n * vel/2L n= 1 - 2 - 3... (L= length of pipe) (?=2L/n)


39. Apparent weight (weight of submerged object)
Felec=qE=[kq1q2]/r²
N= C/velocity.
Apparent weight = Fb- weight= (mfg) - (m0g) = (mass of displaced fluid gravity) - (initial mass of object while hanging in air gravity) = (DfVfg)- (DoVog)
Product of each lens's magnification


40. Graviational force formula
Momentum is always conserved in the absence of an outside force
Threshold frequency=F/h (= work functions/planck's constant)
F=GM1M2/r²
1.6*10?¹? C


41. Electron capture
PEspring= 1/2 kx² (K is spring constant - X is distance spring compressed)
Atom + electron--> Neutron (the addition of an electron - °?1e - causes a proton to change into a neutron - i.e. PROTON TRANSFORMS)
?=h/p (where p= MOMENTUM=m?v - and h is planck's constant)
4.14 10?¹5 eVs


42. Electric force formula? (two)
Felec=qE=[kq1q2]/r²
KE=1/2mv²
Ebinding= ?m * c² (= (?m)c²)
En= [Z²/n² * -13.6ev ] (Z is number of protons in atom's nucleus - n is energy level number)


43. What is the apparent weight of a floating object?
4.14 10?¹5 eVs
Zero.
Longer ? - larger diffraction - smaller shadow.
1/f= 1/di + 1/do


44. Power formula?
A= A0 e ^ [-?t] (= activity at time t=0 e ^ ( - decay constant * time)
Fb= Bperp-to-areaAcos? (Measures density of magnetic field lines that cross through an area)
P=IV=I²R=V² /R = Fd/t= Force*velocity
Fb= mass of displaced fluid * gravity


45. Transformer formula

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46. How to find total magnification?

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47. Critical angle is...
Particles in motion can display wave characteristics - and behave as if they had wavelength (?= h/p)
The incident angle at which total internal reflection occurs (use ?r=90°)
Intensity a Amplitude/ d²
Felec=qE=[kq1q2]/r²


48. Heat of fusion/vaporization fromula
Etotal= E rest + KE= mc² + (Y-1)mc²
Q=m*L (where L is the latent heat of fusion or vaporization)
Particles in motion can display wave characteristics - and behave as if they had wavelength (?= h/p)
E= kq/r² (= f/q)


49. Binding energy explanation
En= [Z²/n² * -13.6ev ] (Z is number of protons in atom's nucleus - n is energy level number)
4.14 10?¹5 eVs
F=mv²/ r
Energy it takes to break a nucleus into separate protons and neutrons (same as energy lost to create atom.)


50. Centripetal force formula
Positive - focus in front of the lens (=real image)
Beat frequency= |F1-F2|
Fingers= Magnetic Field - Thumb=Velocity - Palm of hand= Force. RH=Proton - LH= electron.
F=mv²/ r