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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. Work function F is..?
Length stationary=Length moving/Y
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)
Longer ? - larger diffraction - smaller shadow.
Minimal energy that needs to be imparted to an electron on metal surface in order to liberate it.

2. Newton's first law (Law of...)
Fingers= Magnetic Field - Thumb=Velocity - Palm of hand= Force. RH=Proton - LH= electron.
Torque=force perpendicular to radius r = fr Toruqe=Ia = inertia * angular acceleration
Law of inertia. Object in motion stays in motion unless acted upon by an outside force.
EMFavg. induced= -?Fb/ ?t (= - change in mag flux/change in time)

3. Energy of an emitted photon formula?
Energy of emitted photon = E2-E1 (=Energy level higher- Energy level lower)
W= - kq1q2 (1/r2 - 1/r1)
F= (9/5)C+ 32
A=v²/ r

4. Voltage formula (for circuit - etc.)
Longer ? - larger diffraction - smaller shadow.
V=IR
Neutron --> Proton + electron ( + electron-antineutrino - V with line over it) ( °?1e produced)
P=IV=I²R=V² /R = Fd/t= Force*velocity

5. Capacitance formula? (there are two)
C= Q/V = e0 *A/d
For every action there is an equal and opposite reaction
E0= 8.85 * 10?¹² C²/(Nm²)
Shorter ? - less diffraction - bigger shadow.

6. What is the apparent weight of a floating object?
Longer ? - larger diffraction - smaller shadow.
Zero.
Q=m*L (where L is the latent heat of fusion or vaporization)
N= C/velocity.

7. How to find total magnification?

8. Centripetal force formula
Momentum is always conserved in the absence of an outside force
The release of electrons due to bombardment of an atom by photons (groups of quanta/bundles of matter)
Minimum frequency that needs to illuminate a metal surface for photoELECTRONS to be emitted
F=mv²/ r

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

10. Voltage formula (think units of volts are what?) (NOT in terms of I and R)
931MeV=1amu
KEmax= hf-F (= E-F= Energy of a photon - work function)
Voltage=PE/q (remember Joules/Coulomb= volt)
Momentum is always conserved in the absence of an outside force

11. OPEN PIPE FREQUENCY (Frequency/Harmonic series of a pipe opened at both ends)
Low
E= kq/r² (= f/q)
F= n * vel/2L n= 1 - 2 - 3... (L= length of pipe) (?=2L/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)

12. Centripetal acceleration formula
Energy it takes to break a nucleus into separate protons and neutrons (same as energy lost to create atom.)
A=v²/ r
931MeV=1amu
Proton--> Neutron + positron (+ electron-neutrino - v) (° +1 e is produced)

13. magnitude of charge on electron/proton
?V2/?V1= N2/N1 (if secondary greater than primary it's a step-up transformer).
Q=m*L (where L is the latent heat of fusion or vaporization)
Ebinding= ?m * c² (= (?m)c²)
1.6*10?¹? C

14. Formula for electric field?
The volume of the object.
Negative - focus behind the lens (= virtual image)
C= 3*108 m/s
E= kq/r² (= f/q)

15. Moment of Inertia (a.k.a. rotational mass)
C= Q/V = e0 *A/d
?Tstationary= Y (?Tmoving)
I=mr²
A= A0 e ^ [-?t] (= activity at time t=0 e ^ ( - decay constant * time)

16. Capacitance constant
V= 331 m/s + (.6 m/s°C)Temperature
1/f= 1/di + 1/do
E0= 8.85 * 10?¹² C²/(Nm²)
For every action there is an equal and opposite reaction

17. Sign of focus for convex lens?
Negative - focus behind the lens (= virtual image)
931MeV=1amu
Y= 1/ v(1-(v/c)²)
For every action there is an equal and opposite reaction

18. 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)
PE= 1/2 C (?V)² = 1/2 Q²/C = 1/2 Q?V
PV/nT'= p'V'n'T' (p=pressure - V= VOLUME - T= temperature)
I=mr²

19. Ideal gas law
PV=nRT (p= pressure - V= volume - n= number of moles - T= temperature in KELVIN - R= .0821)
E0= 8.85 * 10?¹² C²/(Nm²)
?Tstationary= Y (?Tmoving)
6.6310 ?³4 Js

20. Apparent weight (weight of submerged object)
6.6310 ?³4 Js
Apparent weight = Fb- weight= (mfg) - (m0g) = (mass of displaced fluid gravity) - (initial mass of object while hanging in air gravity) = (DfVfg)- (DoVog)
EMFavg. induced= -?Fb/ ?t (= - change in mag flux/change in time)
N= C/velocity.

21. Magnification equation
M= -di/do (=-hi/ho)
P=IV=I²R=V² /R = Fd/t= Force*velocity
Felec=qE=[kq1q2]/r²
Low

22. Gravitational constant
PV=nRT (p= pressure - V= volume - n= number of moles - T= temperature in KELVIN - R= .0821)
Momentum is always conserved in the absence of an outside force
G= 6.67 * 10?¹¹ Nm²/kg²
W=(Force parallel)(distance)= Pressure ? V (change in volume)= qvoltage

23. Relativistic formula for velocity
A=v²/ r
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)
Longer ? - larger diffraction - smaller shadow.
PV/nT'= p'V'n'T' (p=pressure - V= VOLUME - T= temperature)

24. Law of reflection
Angle of incidence=Angle of reflection
PE= 1/2 C (?V)² = 1/2 Q²/C = 1/2 Q?V
F=GM1M2/r²
Shorter ? - less diffraction - bigger shadow.

25. Law of refraction
Fingers= Magnetic Field - Thumb=Velocity - Palm of hand= Force. RH=Proton - LH= electron.
Ni sin?i=nrsin?r
Induced current will flow opposite direction of magnetic flux.
931MeV=1amu

26. Power formula?
?Tstationary= Y (?Tmoving)
P=IV=I²R=V² /R = Fd/t= Force*velocity
M= -di/do (=-hi/ho)
Ebinding= ?m * c² (= (?m)c²)

27. Low frequency waves have...
V=f?
931MeV=1amu
The release of electrons due to bombardment of an atom by photons (groups of quanta/bundles of matter)
Longer ? - larger diffraction - smaller shadow.

28. Magnetic force formula (for wire)?
P=IV=I²R=V² /R = Fd/t= Force*velocity
Felec=qE=[kq1q2]/r²
F=ILBsin? (?= angle btw. L and B)
?p=f?t (where f is AVERAGE force and t is how long force is applied)

29. Elastic potential energy for a spring formula
The volume of the object.
PEspring= 1/2 kx² (K is spring constant - X is distance spring compressed)
Ebinding= ?m * c² (= (?m)c²)
Threshold frequency=F/h (= work functions/planck's constant)

30. mass of a proton/neutron (there's a slight difference but ignore it - neutron has slightly more mass)
EMFavg. induced= -?Fb/ ?t (= - change in mag flux/change in time)
G= 6.67 * 10?¹¹ Nm²/kg²
1.67*10?²7kg
K= 9 * 10? Nm²/C²

31. Sign of focus for concave lens?
Vfinal²=V0²+ 2ad
Positive - focus in front of the lens (=real image)
Low
M= -di/do (=-hi/ho)

32. K constant for electric field formula?
?V2/?V1= N2/N1 (if secondary greater than primary it's a step-up transformer).
G= 6.67 * 10?¹¹ Nm²/kg²
K= 9 * 10? Nm²/C²
931MeV=1amu

33. If speed is high - index of refraction is....
M= -di/do (=-hi/ho)
Energy of emitted photon = E2-E1 (=Energy level higher- Energy level lower)
Threshold frequency=F/h (= work functions/planck's constant)
Low

34. Maximum KE with which an emitted electron leaves is...?
1.6*10?¹? C
E= kq/r² (= f/q)
KEmax= hf-F (= E-F= Energy of a photon - work function)
PE=mgh

35. Light intensity is proportional to..
Threshold frequency=F/h (= work functions/planck's constant)
?V2/?V1= N2/N1 (if secondary greater than primary it's a step-up transformer).
Intensity a Amplitude/ d²
F=GM1M2/r²

36. If you drop an object into water the volume displaced equals...
?=h/p (where p= MOMENTUM=m?v - and h is planck's constant)
W=qVoltage. (think C* J/C and C's cancel out)
?p=f?t (where f is AVERAGE force and t is how long force is applied)
The volume of the object.

37. Formula for electric potential energy?
I=mr²
KE= (Y-1)mc² (= (Y-1)E)
KEmax= hf-F (= E-F= Energy of a photon - work function)
PE= 1/2 C (?V)² = 1/2 Q²/C = 1/2 Q?V

38. Planck's constant in electronvolts* seconds?
Zero.
4.14 10?¹5 eVs
E= V/d
Force magnetic= |q|vBsin? (=qVperpendicularB) (?= angle between v and B)

39. Total KE formula
Angle of incidence=Angle of reflection
Longer ? - larger diffraction - smaller shadow.
Vfinal= V0 +at
Etotal= E rest + KE= mc² + (Y-1)mc²

40. Converting Fahrenheit to Celsius
F= n * vel./ 4L n= 1 - 3 - 5.... (L= length of pipe) (?=4L/n)
F= (9/5)C+ 32
KEmax= hf-F (= E-F= Energy of a photon - work function)
Low

41. Potential Energy formula
Product of each lens's magnification
PE=mgh
S= 1/2at² + v0t+ d0 (intial distance is often ignored because we decide where we want to start)
Ni sin?i=nrsin?r

42. New/old gas formula?

43. Graviational force formula
F=GM1M2/r²
Neutron --> Proton + electron ( + electron-antineutrino - V with line over it) ( °?1e produced)
S= 1/2at² + v0t+ d0 (intial distance is often ignored because we decide where we want to start)
E0= 8.85 * 10?¹² C²/(Nm²)

44. (Full) Displacement formula
S= 1/2at² + v0t+ d0 (intial distance is often ignored because we decide where we want to start)
1.6*10?¹? C
M= -di/do (=-hi/ho)
F=mv²/ r

45. Beat frequency
Apparent weight = Fb- weight= (mfg) - (m0g) = (mass of displaced fluid gravity) - (initial mass of object while hanging in air gravity) = (DfVfg)- (DoVog)
Proton--> Neutron + positron (+ electron-neutrino - v) (° +1 e is produced)
Beat frequency= |F1-F2|
Distance= velocity * time

46. Formula for diffraction pattern - Anti-node to node (A-N)
Threshold frequency=F/h (= work functions/planck's constant)
(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)
?= 4L + 1.6d
Neutron --> Proton + electron ( + electron-antineutrino - V with line over it) ( °?1e produced)

47. Faraday's law
Distance= velocity * time
Q=m*L (where L is the latent heat of fusion or vaporization)
Length stationary=Length moving/Y
EMFavg. induced= -?Fb/ ?t (= - change in mag flux/change in time)

48. Relativistic formula for time
W=qVoltage. (think C* J/C and C's cancel out)
S= 1/2at² + v0t+ d0 (intial distance is often ignored because we decide where we want to start)
?Tstationary= Y (?Tmoving)
Beat frequency= |F1-F2|

49. Formula for magnetic flux?
Ni sin?i=nrsin?r
E= V/d
W= - kq1q2 (1/r2 - 1/r1)
Fb= Bperp-to-areaAcos? (Measures density of magnetic field lines that cross through an area)

50. Critical angle is...
Ebinding= ?m * c² (= (?m)c²)
PV/nT'= p'V'n'T' (p=pressure - V= VOLUME - T= temperature)
F=GM1M2/r²
The incident angle at which total internal reflection occurs (use ?r=90°)