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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.
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. Threshold frequency formula?

2. Electric field between two plates formula?
Positive - focus in front of the lens (=real image)
E= V/d
A=v²/ r
Energy it takes to break a nucleus into separate protons and neutrons (same as energy lost to create atom.)

3. Formula for resistance of an OBJECT
Negative - focus behind the lens (= virtual image)
?Tstationary= Y (?Tmoving)
Shorter ? - less diffraction - bigger shadow.
R= ?L/A = (resistivity)(length of wire) / (cross sectional Area)

4. Formula for diffraction pattern - Anti-node to node (A-N)
The incident angle at which total internal reflection occurs (use ?r=90°)
(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)
F=GM1M2/r²
Longer ? - larger diffraction - smaller shadow.

5. What is the apparent weight of a floating object?
Zero.
Threshold frequency=F/h (= work functions/planck's constant)
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)
931MeV=1amu

6. Moment of Inertia (a.k.a. rotational mass)
I=mr²
?IE= - W (work)
Fb= Bperp-to-areaAcos? (Measures density of magnetic field lines that cross through an area)
Fb= mass of displaced fluid * gravity

7. Energy of an emitted photon formula?
R= ?L/A = (resistivity)(length of wire) / (cross sectional Area)
W=(Force parallel)(distance)= Pressure ? V (change in volume)= qvoltage
Y= 1/ v(1-(v/c)²)
Energy of emitted photon = E2-E1 (=Energy level higher- Energy level lower)

8. Work formula
1.67*10?²7kg
Beat frequency= |F1-F2|
W=(Force parallel)(distance)= Pressure ? V (change in volume)= qvoltage
S= 1/2at² + v0t+ d0 (intial distance is often ignored because we decide where we want to start)

9. 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)
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)
Minimal energy that needs to be imparted to an electron on metal surface in order to liberate it.
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)

10. Activity of a radioactive sample formula? (probably don't have to know)
A= A0 e ^ [-?t] (= activity at time t=0 e ^ ( - decay constant * time)
Induced current will flow opposite direction of magnetic flux.
Vfinal²=V0²+ 2ad
Particles in motion can display wave characteristics - and behave as if they had wavelength (?= h/p)

11. Formula for electric field?
Etotal= E rest + KE= mc² + (Y-1)mc²
A= A0 e ^ [-?t] (= activity at time t=0 e ^ ( - decay constant * time)
E= kq/r² (= f/q)
931MeV=1amu

12. Potential Energy formula
Angle of incidence=Angle of reflection
W= - kq1q2 (1/r2 - 1/r1)
Fnet=ma
PE=mgh

13. Converting Fahrenheit to Celsius
F= (9/5)C+ 32
G= 6.67 * 10?¹¹ Nm²/kg²
PV/nT'= p'V'n'T' (p=pressure - V= VOLUME - T= temperature)
W=qVoltage. (think C* J/C and C's cancel out)

14. Index of refraction formula
Law of inertia. Object in motion stays in motion unless acted upon by an outside force.
Minimal energy that needs to be imparted to an electron on metal surface in order to liberate it.
W=qVoltage. (think C* J/C and C's cancel out)
N= C/velocity.

15. Relativistic formula for velocity
F= n * vel./ 4L n= 1 - 3 - 5.... (L= length of pipe) (?=4L/n)
V= 331 m/s + (.6 m/s°C)Temperature
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)
Y= 1/ v(1-(v/c)²)

16. Binding energy formula
Length stationary=Length moving/Y
Ebinding= ?m * c² (= (?m)c²)
Q=mc?T (where T is temperature)
Minimum frequency that needs to illuminate a metal surface for photoELECTRONS to be emitted

17. Elastic potential energy for a spring formula
Distance= velocity * time
PEspring= 1/2 kx² (K is spring constant - X is distance spring compressed)
K= 9 * 10? Nm²/C²
C= 3*108 m/s

18. Formula for magnetic flux?
E0= 8.85 * 10?¹² C²/(Nm²)
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)
V= 331 m/s + (.6 m/s°C)Temperature

19. Mass defect explanation

20. Torque formula
Q= [(mass of A + mass of B) - (mass of C + mass of D)] c² (where A+B-->C+D)
N= C/velocity.
PV=nRT (p= pressure - V= volume - n= number of moles - T= temperature in KELVIN - R= .0821)
Torque=force perpendicular to radius r = fr Toruqe=Ia = inertia * angular acceleration

21. speed of light
C= 3*108 m/s
Product of each lens's magnification
1/f= 1/di + 1/do
F=GM1M2/r²

22. How to find total magnification?

23. Internal energy....equals?
Apparent weight = Fb- weight= (mfg) - (m0g) = (mass of displaced fluid gravity) - (initial mass of object while hanging in air gravity) = (DfVfg)- (DoVog)
Ni sin?i=nrsin?r
6.6310 ?³4 Js
?IE= - W (work)

24. Electron capture
1.6*10?¹? C
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)
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)

25. Critical angle is...
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)
The incident angle at which total internal reflection occurs (use ?r=90°)
A= A0 e ^ [-?t] (= activity at time t=0 e ^ ( - decay constant * time)

26. Maximum KE with which an emitted electron leaves is...?
?V2/?V1= N2/N1 (if secondary greater than primary it's a step-up transformer).
Longer ? - larger diffraction - smaller shadow.
G= 6.67 * 10?¹¹ Nm²/kg²
KEmax= hf-F (= E-F= Energy of a photon - work function)

27. Low frequency waves have...
Force magnetic= |q|vBsin? (=qVperpendicularB) (?= angle between v and B)
Fnet=ma
Longer ? - larger diffraction - smaller shadow.
F=ILBsin? (?= angle btw. L and B)

28. Efficiency of an engine formula
Minimum frequency that needs to illuminate a metal surface for photoELECTRONS to be emitted
Apparent weight = Fb- weight= (mfg) - (m0g) = (mass of displaced fluid gravity) - (initial mass of object while hanging in air gravity) = (DfVfg)- (DoVog)
Shorter ? - less diffraction - bigger shadow.
Eff= 1- Qc/Qh = 1- Tc/Th

29. Relativistic formula for time
?Tstationary= Y (?Tmoving)
Product of each lens's magnification
V= 331 m/s + (.6 m/s°C)Temperature
N= C/velocity.

30. Magnetic force formula (for particle)?
Force magnetic= |q|vBsin? (=qVperpendicularB) (?= angle between v and B)
M= -di/do (=-hi/ho)
F= n * vel./ 4L n= 1 - 3 - 5.... (L= length of pipe) (?=4L/n)
Minimal energy that needs to be imparted to an electron on metal surface in order to liberate it.

31. Threshold frequency explanation?
W=qVoltage. (think C* J/C and C's cancel out)
1.6*10?¹? C
Minimum frequency that needs to illuminate a metal surface for photoELECTRONS to be emitted
F=ILBsin? (?= angle btw. L and B)

32. Work performed by charge displacement? (hopefully...won't have to know)
1.67*10?²7kg
W= - kq1q2 (1/r2 - 1/r1)
PV=nRT (p= pressure - V= volume - n= number of moles - T= temperature in KELVIN - R= .0821)
F= n * vel./ 4L n= 1 - 3 - 5.... (L= length of pipe) (?=4L/n)

33. Relativistic factor Y formula
Vfinal= V0 +at
Y= 1/ v(1-(v/c)²)
?IE= - W (work)
P=mv (?p=m?v)

34. Formula for how velocity changes in air? (probably don't have to know)
(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)
V= 331 m/s + (.6 m/s°C)Temperature
KEmax= hf-F (= E-F= Energy of a photon - work function)
E= V/d

35. Conservation of momentum
F= n * vel./ 4L n= 1 - 3 - 5.... (L= length of pipe) (?=4L/n)
Zero.
M= -di/do (=-hi/ho)
Momentum is always conserved in the absence of an outside force

36. Formula for energy of a photon?

37. Formula for energy levels within any atom?

38. mass of a proton/neutron (there's a slight difference but ignore it - neutron has slightly more mass)
Apparent weight = Fb- weight= (mfg) - (m0g) = (mass of displaced fluid gravity) - (initial mass of object while hanging in air gravity) = (DfVfg)- (DoVog)
1.67*10?²7kg
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)
K= 9 * 10? Nm²/C²

39. (Full/Final) Velocity formula
Zero.
F= (9/5)C+ 32
E= kq/r² (= f/q)
Vfinal= V0 +at

40. Correction factor for wavelength in a diffraction experiment (probably don't have to know)
Ni sin?i=nrsin?r
For every action there is an equal and opposite reaction
Force magnetic= |q|vBsin? (=qVperpendicularB) (?= angle between v and B)
?= 4L + 1.6d

41. Kinetic Energy formula
KE=1/2mv²
Beat frequency= |F1-F2|
PE=mgh
?p=f?t (where f is AVERAGE force and t is how long force is applied)

42. Thin lens equation
Length stationary=Length moving/Y
1/f= 1/di + 1/do
Fb= mass of displaced fluid * gravity
M= -di/do (=-hi/ho)

43. Lenz's law
I=mr²
Energy of emitted photon = E2-E1 (=Energy level higher- Energy level lower)
P=IV=I²R=V² /R = Fd/t= Force*velocity
Induced current will flow opposite direction of magnetic flux.

44. Transformer formula

45. Magnetic force formula (for wire)?
S= 1/2at² + v0t+ d0 (intial distance is often ignored because we decide where we want to start)
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)
F=ILBsin? (?= angle btw. L and B)
Energy it takes to break a nucleus into separate protons and neutrons (same as energy lost to create atom.)

46. Formula for electric potential energy?
M= -di/do (=-hi/ho)
E=hf (= Planck's constant*frequency)
PE= 1/2 C (?V)² = 1/2 Q²/C = 1/2 Q?V
Beat frequency= |F1-F2|

47. ß? decay?
F=mv²/ r
Fb= Bperp-to-areaAcos? (Measures density of magnetic field lines that cross through an area)
Force magnetic= |q|vBsin? (=qVperpendicularB) (?= angle between v and B)
Proton--> Neutron + positron (+ electron-neutrino - v) (° +1 e is produced)

48. energy in a reaction q formula?
The volume of the object.
Q= [(mass of A + mass of B) - (mass of C + mass of D)] c² (where A+B-->C+D)
M= -di/do (=-hi/ho)
Neutron --> Proton + electron ( + electron-antineutrino - V with line over it) ( °?1e produced)

49. magnitude of charge on electron/proton
Vfinal²=V0²+ 2ad
1.6*10?¹? C
Positive - focus in front of the lens (=real image)
C= 3*108 m/s

50. Apparent weight (weight of submerged object)
Intensity a Amplitude/ d²
E= V/d
KE=1/2mv²
Apparent weight = Fb- weight= (mfg) - (m0g) = (mass of displaced fluid gravity) - (initial mass of object while hanging in air gravity) = (DfVfg)- (DoVog)