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. Activity of a radioactive sample formula? (probably don't have to know)
Positive - focus in front of the lens (=real image)
KEmax= hf-F (= E-F= Energy of a photon - work function)
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)
A= A0 e ^ [-?t] (= activity at time t=0 e ^ ( - decay constant * time)


2. Critical angle is...
V= 331 m/s + (.6 m/s°C)Temperature
Law of inertia. Object in motion stays in motion unless acted upon by an outside force.
Beat frequency= |F1-F2|
The incident angle at which total internal reflection occurs (use ?r=90°)


3. ß? decay?
E= kq/r² (= f/q)
Atom + electron--> Neutron (the addition of an electron - °?1e - causes a proton to change into a neutron - i.e. PROTON TRANSFORMS)
Positive - focus in front of the lens (=real image)
Proton--> Neutron + positron (+ electron-neutrino - v) (° +1 e is produced)


4. (Full/Final) Velocity formula
Vfinal= V0 +at
Fb= Bperp-to-areaAcos? (Measures density of magnetic field lines that cross through an area)
KEmax= hf-F (= E-F= Energy of a photon - work function)
P=mv (?p=m?v)


5. Maximum KE with which an emitted electron leaves is...?
?p=f?t (where f is AVERAGE force and t is how long force is applied)
KEmax= hf-F (= E-F= Energy of a photon - work function)
Etotal= E rest + KE= mc² + (Y-1)mc²
Intensity a Amplitude/ d²


6. Total KE formula
Etotal= E rest + KE= mc² + (Y-1)mc²
KE= (Y-1)mc² (= (Y-1)E)
Beat frequency= |F1-F2|
Apparent weight = Fb- weight= (mfg) - (m0g) = (mass of displaced fluid gravity) - (initial mass of object while hanging in air gravity) = (DfVfg)- (DoVog)


7. Relativistic factor Y formula
Proton--> Neutron + positron (+ electron-neutrino - v) (° +1 e is produced)
W=qVoltage. (think C* J/C and C's cancel out)
?= 4L + 1.6d
Y= 1/ v(1-(v/c)²)


8. Newton's second law
Fnet=ma
PE= 1/2 C (?V)² = 1/2 Q²/C = 1/2 Q?V
PV=nRT (p= pressure - V= volume - n= number of moles - T= temperature in KELVIN - R= .0821)
Induced current will flow opposite direction of magnetic flux.


9. Converting Fahrenheit to Celsius
Momentum is always conserved in the absence of an outside force
Q=mc?T (where T is temperature)
V= 331 m/s + (.6 m/s°C)Temperature
F= (9/5)C+ 32


10. Planck's constant in electronvolts* seconds?
4.14 10?¹5 eVs
Q=mc?T (where T is temperature)
KEmax= hf-F (= E-F= Energy of a photon - work function)
Momentum is always conserved in the absence of an outside force


11. Buoyant force formula
Low
For every action there is an equal and opposite reaction
F= n * vel/2L n= 1 - 2 - 3... (L= length of pipe) (?=2L/n)
Fb= mass of displaced fluid * gravity


12. Beat frequency
Fnet=ma
C= Q/V = e0 *A/d
Beat frequency= |F1-F2|
Longer ? - larger diffraction - smaller shadow.


13. Formula for velocity of waves?
Proton--> Neutron + positron (+ electron-neutrino - v) (° +1 e is produced)
V=f?
A=v²/ r
Force magnetic= |q|vBsin? (=qVperpendicularB) (?= angle between v and B)


14. deBrolglie wavelength formula

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15. What is the apparent weight of a floating object?
R= ?L/A = (resistivity)(length of wire) / (cross sectional Area)
?=h/p (where p= MOMENTUM=m?v - and h is planck's constant)
Felec=qE=[kq1q2]/r²
Zero.


16. OPEN PIPE FREQUENCY (Frequency/Harmonic series of a pipe opened at both ends)
R= ?L/A = (resistivity)(length of wire) / (cross sectional Area)
G= 6.67 * 10?¹¹ Nm²/kg²
F= n * vel/2L n= 1 - 2 - 3... (L= length of pipe) (?=2L/n)
Vfinal²=V0²+ 2ad


17. New/old gas formula?

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18. Formula for how velocity changes in air? (probably don't have to know)
F= (9/5)C+ 32
V= 331 m/s + (.6 m/s°C)Temperature
N= C/velocity.
Force magnetic= |q|vBsin? (=qVperpendicularB) (?= angle between v and B)


19. Work performed by charge displacement? (hopefully...won't have to know)
F= (9/5)C+ 32
W=(Force parallel)(distance)= Pressure ? V (change in volume)= qvoltage
Longer ? - larger diffraction - smaller shadow.
W= - kq1q2 (1/r2 - 1/r1)


20. Voltage formula (for circuit - etc.)
Fb= Bperp-to-areaAcos? (Measures density of magnetic field lines that cross through an area)
Low
The release of electrons due to bombardment of an atom by photons (groups of quanta/bundles of matter)
V=IR


21. If you drop an object into water the volume displaced equals...
V=f?
The volume of the object.
Torque=force perpendicular to radius r = fr Toruqe=Ia = inertia * angular acceleration
Fnet=ma


22. magnitude of charge on electron/proton
Particles in motion can display wave characteristics - and behave as if they had wavelength (?= h/p)
1.6*10?¹? C
Vfinal= V0 +at
Intensity a Amplitude/ d²


23. Relativistic formula for length
1.6*10?¹? C
Proton--> Neutron + positron (+ electron-neutrino - v) (° +1 e is produced)
Zero.
Length stationary=Length moving/Y


24. Voltage formula (think units of volts are what?) (NOT in terms of I and R)
Voltage=PE/q (remember Joules/Coulomb= volt)
V= 331 m/s + (.6 m/s°C)Temperature
Q=m*L (where L is the latent heat of fusion or vaporization)
Distance= velocity * time


25. Binding energy explanation
6.6310 ?³4 Js
PV=nRT (p= pressure - V= volume - n= number of moles - T= temperature in KELVIN - R= .0821)
Y= 1/ v(1-(v/c)²)
Energy it takes to break a nucleus into separate protons and neutrons (same as energy lost to create atom.)


26. Heat formula
F= (9/5)C+ 32
Q=mc?T (where T is temperature)
F=GM1M2/r²
Minimal energy that needs to be imparted to an electron on metal surface in order to liberate it.


27. How to find total magnification?

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28. Momentum formula?
F= n * vel/2L n= 1 - 2 - 3... (L= length of pipe) (?=2L/n)
The incident angle at which total internal reflection occurs (use ?r=90°)
P=mv (?p=m?v)
Particles in motion can display wave characteristics - and behave as if they had wavelength (?= h/p)


29. K constant for electric field formula?
K= 9 * 10? Nm²/C²
The release of electrons due to bombardment of an atom by photons (groups of quanta/bundles of matter)
?IE= - W (work)
R= ?L/A = (resistivity)(length of wire) / (cross sectional Area)


30. Efficiency of an engine formula
Negative - focus behind the lens (= virtual image)
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)
Eff= 1- Qc/Qh = 1- Tc/Th
V=f?


31. Formula for magnetic flux?
Fb= Bperp-to-areaAcos? (Measures density of magnetic field lines that cross through an area)
KE=1/2mv²
F= (9/5)C+ 32
E=hf (= Planck's constant*frequency)


32. Kinetic Energy formula
G= 6.67 * 10?¹¹ Nm²/kg²
Q=mc?T (where T is temperature)
KE=1/2mv²
Particles in motion can display wave characteristics - and behave as if they had wavelength (?= h/p)


33. deBroglie wavelength explanation
PE=mgh
KE=1/2mv²
N= C/velocity.
Particles in motion can display wave characteristics - and behave as if they had wavelength (?= h/p)


34. Impulse formula
KE=1/2mv²
?p=f?t (where f is AVERAGE force and t is how long force is applied)
Voltage=PE/q (remember Joules/Coulomb= volt)
F=mv²/ r


35. Work formula
Angle of incidence=Angle of reflection
W=(Force parallel)(distance)= Pressure ? V (change in volume)= qvoltage
F=ILBsin? (?= angle btw. L and B)
Ni sin?i=nrsin?r


36. Work function F is..?
Minimal energy that needs to be imparted to an electron on metal surface in order to liberate it.
Eff= 1- Qc/Qh = 1- Tc/Th
C= Q/V = e0 *A/d
Q=mc?T (where T is temperature)


37. Capacitance constant
V=IR
E0= 8.85 * 10?¹² C²/(Nm²)
Negative - focus behind the lens (= virtual image)
Ebinding= ?m * c² (= (?m)c²)


38. If speed is high - index of refraction is....
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)
Low
Vfinal= V0 +at


39. Sign of focus for concave lens?
Neutron --> Proton + electron ( + electron-antineutrino - V with line over it) ( °?1e produced)
Positive - focus in front of the lens (=real image)
Law of inertia. Object in motion stays in motion unless acted upon by an outside force.
KE=1/2mv²


40. Power formula?
P=IV=I²R=V² /R = Fd/t= Force*velocity
Force magnetic= |q|vBsin? (=qVperpendicularB) (?= angle between v and B)
F=GM1M2/r²
?IE= - W (work)


41. Distance formula?
Zero.
P=IV=I²R=V² /R = Fd/t= Force*velocity
Distance= velocity * time
Energy it takes to break a nucleus into separate protons and neutrons (same as energy lost to create atom.)


42. Formula for electric potential energy?
F= n * vel/2L n= 1 - 2 - 3... (L= length of pipe) (?=2L/n)
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)
Torque=force perpendicular to radius r = fr Toruqe=Ia = inertia * angular acceleration
PE= 1/2 C (?V)² = 1/2 Q²/C = 1/2 Q?V


43. Velocity formula if time not given
I=mr²
Intensity a Amplitude/ d²
Vfinal²=V0²+ 2ad
Q= [(mass of A + mass of B) - (mass of C + mass of D)] c² (where A+B-->C+D)


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

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45. Light intensity is proportional to..
Neutron --> Proton + electron ( + electron-antineutrino - V with line over it) ( °?1e produced)
Longer ? - larger diffraction - smaller shadow.
Intensity a Amplitude/ d²
Vfinal= V0 +at


46. Electron capture
Threshold frequency=F/h (= work functions/planck's constant)
Length stationary=Length moving/Y
Atom + electron--> Neutron (the addition of an electron - °?1e - causes a proton to change into a neutron - i.e. PROTON TRANSFORMS)
?= 4L + 1.6d


47. High frequency wave shave...
E=hf (= Planck's constant*frequency)
The release of electrons due to bombardment of an atom by photons (groups of quanta/bundles of matter)
Shorter ? - less diffraction - bigger shadow.
931MeV=1amu


48. Sign of focus for convex lens?
KE= (Y-1)mc² (= (Y-1)E)
Positive - focus in front of the lens (=real image)
Negative - focus behind the lens (= virtual image)
V=f?


49. Correction factor for wavelength in a diffraction experiment (probably don't have to know)
K= 9 * 10? Nm²/C²
Minimum frequency that needs to illuminate a metal surface for photoELECTRONS to be emitted
6.6310 ?³4 Js
?= 4L + 1.6d


50. Mass defect explanation

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