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. Electric force formula? (two)
Fingers= Magnetic Field - Thumb=Velocity - Palm of hand= Force. RH=Proton - LH= electron.
Felec=qE=[kq1q2]/r²
W=(Force parallel)(distance)= Pressure ? V (change in volume)= qvoltage
Negative - focus behind the lens (= virtual image)


2. Internal energy....equals?
Longer ? - larger diffraction - smaller shadow.
?=h/p (where p= MOMENTUM=m?v - and h is planck's constant)
?IE= - W (work)
A= A0 e ^ [-?t] (= activity at time t=0 e ^ ( - decay constant * time)


3. Relativistic factor Y formula
Ni sin?i=nrsin?r
Negative - focus behind the lens (= virtual image)
V=IR
Y= 1/ v(1-(v/c)²)


4. Index of refraction formula
?= 4L + 1.6d
EMFavg. induced= -?Fb/ ?t (= - change in mag flux/change in time)
N= C/velocity.
F= n * vel/2L n= 1 - 2 - 3... (L= length of pipe) (?=2L/n)


5. deBrolglie wavelength formula

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6. Work function F is..?
Minimal energy that needs to be imparted to an electron on metal surface in order to liberate it.
Large/high
E= V/d
Threshold frequency=F/h (= work functions/planck's constant)


7. Relativistic formula for length
PV/nT'= p'V'n'T' (p=pressure - V= VOLUME - T= temperature)
Length stationary=Length moving/Y
Zero.
1.6*10?¹? C


8. Work formula
W=(Force parallel)(distance)= Pressure ? V (change in volume)= qvoltage
?IE= - W (work)
R= ?L/A = (resistivity)(length of wire) / (cross sectional Area)
Longer ? - larger diffraction - smaller shadow.


9. Voltage formula (for circuit - etc.)
Apparent weight = Fb- weight= (mfg) - (m0g) = (mass of displaced fluid gravity) - (initial mass of object while hanging in air gravity) = (DfVfg)- (DoVog)
The incident angle at which total internal reflection occurs (use ?r=90°)
V=IR
En= [Z²/n² * -13.6ev ] (Z is number of protons in atom's nucleus - n is energy level number)


10. Potential Energy formula
PE=mgh
Q=mc?T (where T is temperature)
Distance= velocity * time
(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)


11. Formula for energy levels within any atom?

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12. speed of light
?=h/p (where p= MOMENTUM=m?v - and h is planck's constant)
Atom + electron--> Neutron (the addition of an electron - °?1e - causes a proton to change into a neutron - i.e. PROTON TRANSFORMS)
Distance= velocity * time
C= 3*108 m/s


13. Activity of a radioactive sample formula? (probably don't have to know)
PV/nT'= p'V'n'T' (p=pressure - V= VOLUME - T= temperature)
Product of each lens's magnification
A= A0 e ^ [-?t] (= activity at time t=0 e ^ ( - decay constant * time)
The incident angle at which total internal reflection occurs (use ?r=90°)


14. Threshold frequency explanation?
Q=mc?T (where T is temperature)
Minimum frequency that needs to illuminate a metal surface for photoELECTRONS to be emitted
Threshold frequency=F/h (= work functions/planck's constant)
Q= [(mass of A + mass of B) - (mass of C + mass of D)] c² (where A+B-->C+D)


15. Power formula?
Beat frequency= |F1-F2|
P=IV=I²R=V² /R = Fd/t= Force*velocity
The volume of the object.
Positive - focus in front of the lens (=real image)


16. Law of refraction
?Tstationary= Y (?Tmoving)
Threshold frequency=F/h (= work functions/planck's constant)
Vfinal²=V0²+ 2ad
Ni sin?i=nrsin?r


17. Formula for electric field?
Particles in motion can display wave characteristics - and behave as if they had wavelength (?= h/p)
E= kq/r² (= f/q)
The volume of the object.
En= [Z²/n² * -13.6ev ] (Z is number of protons in atom's nucleus - n is energy level number)


18. Planck's constant in electronvolts* seconds?
Vfinal= V0 +at
4.14 10?¹5 eVs
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.


19. Binding energy explanation
A= A0 e ^ [-?t] (= activity at time t=0 e ^ ( - decay constant * time)
Energy it takes to break a nucleus into separate protons and neutrons (same as energy lost to create atom.)
C= 3*108 m/s
Etotal= E rest + KE= mc² + (Y-1)mc²


20. Relativistic formula for (kinetic) energy
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)
Intensity a Amplitude/ d²
Positive - focus in front of the lens (=real image)
KE= (Y-1)mc² (= (Y-1)E)


21. Heat of fusion/vaporization fromula
Threshold frequency=F/h (= work functions/planck's constant)
Voltage=PE/q (remember Joules/Coulomb= volt)
Low
Q=m*L (where L is the latent heat of fusion or vaporization)


22. ONE END CAPPED PIPE FREQUENCY (Frequency/Harmonic series of a pipe closed at one ned)
F= n * vel./ 4L n= 1 - 3 - 5.... (L= length of pipe) (?=4L/n)
G= 6.67 * 10?¹¹ Nm²/kg²
P=mv (?p=m?v)
?=h/p (where p= MOMENTUM=m?v - and h is planck's constant)


23. Ideal gas law
PV=nRT (p= pressure - V= volume - n= number of moles - T= temperature in KELVIN - R= .0821)
Fingers= Magnetic Field - Thumb=Velocity - Palm of hand= Force. RH=Proton - LH= electron.
Atom + electron--> Neutron (the addition of an electron - °?1e - causes a proton to change into a neutron - i.e. PROTON TRANSFORMS)
Shorter ? - less diffraction - bigger shadow.


24. ß? decay?
Proton--> Neutron + positron (+ electron-neutrino - v) (° +1 e is produced)
6.6310 ?³4 Js
En= [Z²/n² * -13.6ev ] (Z is number of protons in atom's nucleus - n is energy level number)
Felec=qE=[kq1q2]/r²


25. Converting Fahrenheit to Celsius
Longer ? - larger diffraction - smaller shadow.
6.6310 ?³4 Js
F= (9/5)C+ 32
Fb= mass of displaced fluid * gravity


26. Correction factor for wavelength in a diffraction experiment (probably don't have to know)
Low
Product of each lens's magnification
Beat frequency= |F1-F2|
?= 4L + 1.6d


27. Formula for velocity of waves?
V=f?
Fingers= Magnetic Field - Thumb=Velocity - Palm of hand= Force. RH=Proton - LH= electron.
KEmax= hf-F (= E-F= Energy of a photon - work function)
V=IR


28. Formula for energy of a photon?

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29. Capacitance constant
PE= 1/2 C (?V)² = 1/2 Q²/C = 1/2 Q?V
Force magnetic= |q|vBsin? (=qVperpendicularB) (?= angle between v and B)
Product of each lens's magnification
E0= 8.85 * 10?¹² C²/(Nm²)


30. Light intensity is proportional to..
W= - kq1q2 (1/r2 - 1/r1)
Intensity a Amplitude/ d²
?V2/?V1= N2/N1 (if secondary greater than primary it's a step-up transformer).
Voltage=PE/q (remember Joules/Coulomb= volt)


31. Lenz's law
V= 331 m/s + (.6 m/s°C)Temperature
Intensity a Amplitude/ d²
F= n * vel/2L n= 1 - 2 - 3... (L= length of pipe) (?=2L/n)
Induced current will flow opposite direction of magnetic flux.


32. mass of a proton/neutron (there's a slight difference but ignore it - neutron has slightly more mass)
1.67*10?²7kg
E= V/d
?=h/p (where p= MOMENTUM=m?v - and h is planck's constant)
Fnet=ma


33. Efficiency of an engine formula
Y= 1/ v(1-(v/c)²)
Negative - focus behind the lens (= virtual image)
Eff= 1- Qc/Qh = 1- Tc/Th
P=IV=I²R=V² /R = Fd/t= Force*velocity


34. Conservation of momentum
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)
W=qVoltage. (think C* J/C and C's cancel out)
Momentum is always conserved in the absence of an outside force
G= 6.67 * 10?¹¹ Nm²/kg²


35. Threshold frequency formula?

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36. What is the apparent weight of a floating object?
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)
Voltage=PE/q (remember Joules/Coulomb= volt)
Length stationary=Length moving/Y
Zero.


37. Formula for magnetic flux?
Fb= Bperp-to-areaAcos? (Measures density of magnetic field lines that cross through an area)
?p=f?t (where f is AVERAGE force and t is how long force is applied)
Energy it takes to break a nucleus into separate protons and neutrons (same as energy lost to create atom.)
P=mv (?p=m?v)


38. If speed is slow/low - index of refraction is...
Intensity a Amplitude/ d²
Large/high
PV=nRT (p= pressure - V= volume - n= number of moles - T= temperature in KELVIN - R= .0821)
Minimum frequency that needs to illuminate a metal surface for photoELECTRONS to be emitted


39. Sign of focus for convex lens?
Positive - focus in front of the lens (=real image)
Negative - focus behind the lens (= virtual image)
P=IV=I²R=V² /R = Fd/t= Force*velocity
Large/high


40. Electron capture
Particles in motion can display wave characteristics - and behave as if they had wavelength (?= h/p)
Angle of incidence=Angle of reflection
Atom + electron--> Neutron (the addition of an electron - °?1e - causes a proton to change into a neutron - i.e. PROTON TRANSFORMS)
W=qVoltage. (think C* J/C and C's cancel out)


41. Energy of an emitted photon formula?
Energy of emitted photon = E2-E1 (=Energy level higher- Energy level lower)
Induced current will flow opposite direction of magnetic flux.
Atom + electron--> Neutron (the addition of an electron - °?1e - causes a proton to change into a neutron - i.e. PROTON TRANSFORMS)
Particles in motion can display wave characteristics - and behave as if they had wavelength (?= h/p)


42. Sign of focus for concave lens?
Large/high
Positive - focus in front of the lens (=real image)
Negative - focus behind the lens (= virtual image)
Energy of emitted photon = E2-E1 (=Energy level higher- Energy level lower)


43. Maximum KE with which an emitted electron leaves is...?
Felec=qE=[kq1q2]/r²
PEspring= 1/2 kx² (K is spring constant - X is distance spring compressed)
KEmax= hf-F (= E-F= Energy of a photon - work function)
E0= 8.85 * 10?¹² C²/(Nm²)


44. energy in a reaction q formula?
PEspring= 1/2 kx² (K is spring constant - X is distance spring compressed)
Q= [(mass of A + mass of B) - (mass of C + mass of D)] c² (where A+B-->C+D)
PE=mgh
PV/nT'= p'V'n'T' (p=pressure - V= VOLUME - T= temperature)


45. Moment of Inertia (a.k.a. rotational mass)
Vfinal= V0 +at
I=mr²
A= A0 e ^ [-?t] (= activity at time t=0 e ^ ( - decay constant * time)
Felec=qE=[kq1q2]/r²


46. Mass defect explanation

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47. Formula for resistance of an OBJECT
Intensity a Amplitude/ d²
Distance= velocity * time
R= ?L/A = (resistivity)(length of wire) / (cross sectional Area)
931MeV=1amu


48. Kinetic Energy formula
Distance= velocity * time
The release of electrons due to bombardment of an atom by photons (groups of quanta/bundles of matter)
?Tstationary= Y (?Tmoving)
KE=1/2mv²


49. Centripetal acceleration formula
4.14 10?¹5 eVs
En= [Z²/n² * -13.6ev ] (Z is number of protons in atom's nucleus - n is energy level number)
F= n * vel./ 4L n= 1 - 3 - 5.... (L= length of pipe) (?=4L/n)
A=v²/ r


50. Formula for electric potential energy?
W=qVoltage. (think C* J/C and C's cancel out)
Zero.
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)
PE= 1/2 C (?V)² = 1/2 Q²/C = 1/2 Q?V