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SAT Subject Test: Physics Formulas

Instructions:

Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
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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. Formula for electric field?
A= A0 e ^ [-?t] (= activity at time t=0 e ^ ( - decay constant * time)
R= ?L/A = (resistivity)(length of wire) / (cross sectional Area)
E= kq/r² (= f/q)
PV=nRT (p= pressure - V= volume - n= number of moles - T= temperature in KELVIN - R= .0821)

2. Heat formula
Proton--> Neutron + positron (+ electron-neutrino - v) (° +1 e is produced)
Vfinal= V0 +at
Q=mc?T (where T is temperature)
Felec=qE=[kq1q2]/r²

3. Centripetal force formula
Ni sin?i=nrsin?r
En= [Z²/n² * -13.6ev ] (Z is number of protons in atom's nucleus - n is energy level number)
Neutron --> Proton + electron ( + electron-antineutrino - V with line over it) ( °?1e produced)
F=mv²/ r

4. K constant for electric field formula?
K= 9 * 10? Nm²/C²
Low
Intensity a Amplitude/ d²
Induced current will flow opposite direction of magnetic flux.

5. Index of refraction formula
Threshold frequency=F/h (= work functions/planck's constant)
En= [Z²/n² * -13.6ev ] (Z is number of protons in atom's nucleus - n is energy level number)
Y= 1/ v(1-(v/c)²)
N= C/velocity.

6. OPEN PIPE FREQUENCY (Frequency/Harmonic series of a pipe opened at both ends)
Ebinding= ?m * c² (= (?m)c²)
Vfinal²=V0²+ 2ad
?V2/?V1= N2/N1 (if secondary greater than primary it's a step-up transformer).
F= n * vel/2L n= 1 - 2 - 3... (L= length of pipe) (?=2L/n)

7. Distance formula?
PV/nT'= p'V'n'T' (p=pressure - V= VOLUME - T= temperature)
E= kq/r² (= f/q)
Q= [(mass of A + mass of B) - (mass of C + mass of D)] c² (where A+B-->C+D)
Distance= velocity * time

8. Ideal gas law
W=qVoltage. (think C* J/C and C's cancel out)
KE=1/2mv²
PV=nRT (p= pressure - V= volume - n= number of moles - T= temperature in KELVIN - R= .0821)
For every action there is an equal and opposite reaction

9. If you drop an object into water the volume displaced equals...
R= ?L/A = (resistivity)(length of wire) / (cross sectional Area)
931MeV=1amu
The volume of the object.
Large/high

10. Newton's first law (Law of...)
KE= (Y-1)mc² (= (Y-1)E)
Force magnetic= |q|vBsin? (=qVperpendicularB) (?= angle between v and B)
Threshold frequency=F/h (= work functions/planck's constant)
Law of inertia. Object in motion stays in motion unless acted upon by an outside force.

11. Newton's second law
Force magnetic= |q|vBsin? (=qVperpendicularB) (?= angle between v and B)
Atom + electron--> Neutron (the addition of an electron - °?1e - causes a proton to change into a neutron - i.e. PROTON TRANSFORMS)
Longer ? - larger diffraction - smaller shadow.
Fnet=ma

12. Gravitational constant
Fb= mass of displaced fluid * gravity
G= 6.67 * 10?¹¹ Nm²/kg²
PEspring= 1/2 kx² (K is spring constant - X is distance spring compressed)
Q=m*L (where L is the latent heat of fusion or vaporization)

13. Energy of an emitted photon formula?
Energy of emitted photon = E2-E1 (=Energy level higher- Energy level lower)
P=IV=I²R=V² /R = Fd/t= Force*velocity
PEspring= 1/2 kx² (K is spring constant - X is distance spring compressed)
?Tstationary= Y (?Tmoving)

14. deBrolglie wavelength formula

15. Transformer formula

16. (Full) Displacement formula
Energy it takes to break a nucleus into separate protons and neutrons (same as energy lost to create atom.)
PV=nRT (p= pressure - V= volume - n= number of moles - T= temperature in KELVIN - R= .0821)
S= 1/2at² + v0t+ d0 (intial distance is often ignored because we decide where we want to start)
Minimal energy that needs to be imparted to an electron on metal surface in order to liberate it.

17. Voltage formula (for circuit - etc.)
V=IR
W=qVoltage. (think C* J/C and C's cancel out)
Fingers= Magnetic Field - Thumb=Velocity - Palm of hand= Force. RH=Proton - LH= electron.
Beat frequency= |F1-F2|

18. Heat of fusion/vaporization fromula
G= 6.67 * 10?¹¹ Nm²/kg²
Q=m*L (where L is the latent heat of fusion or vaporization)
Longer ? - larger diffraction - smaller shadow.
I=mr²

19. Electric force formula? (two)
A= A0 e ^ [-?t] (= activity at time t=0 e ^ ( - decay constant * time)
Felec=qE=[kq1q2]/r²
C= Q/V = e0 *A/d
E= kq/r² (= f/q)

20. Newton's third law
For every action there is an equal and opposite reaction
Large/high
F=ILBsin? (?= angle btw. L and B)
M= -di/do (=-hi/ho)

21. Formula for diffraction pattern - Anti-node to node (A-N)
I=mr²
1.67*10?²7kg
For every action there is an equal and opposite reaction
(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)

22. What is the apparent weight of a floating object?
Y= 1/ v(1-(v/c)²)
Intensity a Amplitude/ d²
Zero.
Torque=force perpendicular to radius r = fr Toruqe=Ia = inertia * angular acceleration

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

24. Magnification equation
Fb= mass of displaced fluid * gravity
M= -di/do (=-hi/ho)
G= 6.67 * 10?¹¹ Nm²/kg²
Y= 1/ v(1-(v/c)²)

25. Impulse formula
Energy it takes to break a nucleus into separate protons and neutrons (same as energy lost to create atom.)
?p=f?t (where f is AVERAGE force and t is how long force is applied)
F= n * vel./ 4L n= 1 - 3 - 5.... (L= length of pipe) (?=4L/n)
Momentum is always conserved in the absence of an outside force

26. energy in a reaction q formula?
Particles in motion can display wave characteristics - and behave as if they had wavelength (?= h/p)
Longer ? - larger diffraction - smaller shadow.
Low
Q= [(mass of A + mass of B) - (mass of C + mass of D)] c² (where A+B-->C+D)

27. Low frequency waves have...
Vfinal= V0 +at
Particles in motion can display wave characteristics - and behave as if they had wavelength (?= h/p)
Longer ? - larger diffraction - smaller shadow.
1/f= 1/di + 1/do

28. Momentum formula?
PV=nRT (p= pressure - V= volume - n= number of moles - T= temperature in KELVIN - R= .0821)
Angle of incidence=Angle of reflection
P=mv (?p=m?v)
Q=mc?T (where T is temperature)

29. Maximum KE with which an emitted electron leaves is...?
EMFavg. induced= -?Fb/ ?t (= - change in mag flux/change in time)
KEmax= hf-F (= E-F= Energy of a photon - work function)
The volume of the object.
Atom + electron--> Neutron (the addition of an electron - °?1e - causes a proton to change into a neutron - i.e. PROTON TRANSFORMS)

30. Capacitance constant
Threshold frequency=F/h (= work functions/planck's constant)
Fb= mass of displaced fluid * gravity
M= -di/do (=-hi/ho)
E0= 8.85 * 10?¹² C²/(Nm²)

31. Buoyant force formula
Fnet=ma
Minimal energy that needs to be imparted to an electron on metal surface in order to liberate it.
Fb= mass of displaced fluid * gravity
PV=nRT (p= pressure - V= volume - n= number of moles - T= temperature in KELVIN - R= .0821)

32. (Full/Final) Velocity formula
Vfinal= V0 +at
F= n * vel/2L n= 1 - 2 - 3... (L= length of pipe) (?=2L/n)
Large/high
V= 331 m/s + (.6 m/s°C)Temperature

33. Beat frequency
V=f?
Beat frequency= |F1-F2|
Particles in motion can display wave characteristics - and behave as if they had wavelength (?= h/p)
For every action there is an equal and opposite reaction

34. Converting Fahrenheit to Celsius
A= A0 e ^ [-?t] (= activity at time t=0 e ^ ( - decay constant * time)
Fb= mass of displaced fluid * gravity
Eff= 1- Qc/Qh = 1- Tc/Th
F= (9/5)C+ 32

35. Conversion factor from atomic mass units to MeV?
PE=mgh
931MeV=1amu
V= 331 m/s + (.6 m/s°C)Temperature
C= Q/V = e0 *A/d

36. Formula for energy of a photon?

37. Graviational force formula
Neutron --> Proton + electron ( + electron-antineutrino - V with line over it) ( °?1e produced)
F=GM1M2/r²
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=v²/ r

38. Conservation of momentum
Momentum is always conserved in the absence of an outside force
Minimum frequency that needs to illuminate a metal surface for photoELECTRONS to be emitted
Positive - focus in front of the lens (=real image)
Y= 1/ v(1-(v/c)²)

39. Threshold frequency formula?

40. Planck's constant in electronvolts* seconds?
Vfinal²=V0²+ 2ad
A=v²/ r
Negative - focus behind the lens (= virtual image)
4.14 10?¹5 eVs

41. Magnetic force formula (for wire)?
Atom + electron--> Neutron (the addition of an electron - °?1e - causes a proton to change into a neutron - i.e. PROTON TRANSFORMS)
F=ILBsin? (?= angle btw. L and B)
(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)
Beat frequency= |F1-F2|

42. How to find total magnification?

43. Formula for magnetic flux?
?IE= - W (work)
?=h/p (where p= MOMENTUM=m?v - and h is planck's constant)
Fb= Bperp-to-areaAcos? (Measures density of magnetic field lines that cross through an area)
Threshold frequency=F/h (= work functions/planck's constant)

44. Velocity formula if time not given
4.14 10?¹5 eVs
Momentum is always conserved in the absence of an outside force
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)

45. If speed is slow/low - index of refraction is...
Shorter ? - less diffraction - bigger shadow.
Large/high
A=v²/ r
Fb= mass of displaced fluid * gravity

46. Capacitance formula? (there are two)
Voltage=PE/q (remember Joules/Coulomb= volt)
?IE= - W (work)
Q= [(mass of A + mass of B) - (mass of C + mass of D)] c² (where A+B-->C+D)
C= Q/V = e0 *A/d

47. Electron capture
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)
Fb= Bperp-to-areaAcos? (Measures density of magnetic field lines that cross through an area)
Atom + electron--> Neutron (the addition of an electron - °?1e - causes a proton to change into a neutron - i.e. PROTON TRANSFORMS)
Proton--> Neutron + positron (+ electron-neutrino - v) (° +1 e is produced)

48. Light intensity is proportional to..
Shorter ? - less diffraction - bigger shadow.
Momentum is always conserved in the absence of an outside force
Intensity a Amplitude/ d²
PV=nRT (p= pressure - V= volume - n= number of moles - T= temperature in KELVIN - R= .0821)

49. High frequency wave shave...
For every action there is an equal and opposite reaction
Fb= Bperp-to-areaAcos? (Measures density of magnetic field lines that cross through an area)
Shorter ? - less diffraction - bigger shadow.
G= 6.67 * 10?¹¹ Nm²/kg²

50. Power formula?
4.14 10?¹5 eVs
P=IV=I²R=V² /R = Fd/t= Force*velocity
W=qVoltage. (think C* J/C and C's cancel out)
PE=mgh