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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..?
Minimum frequency that needs to illuminate a metal surface for photoELECTRONS to be emitted
Fnet=ma
Minimal energy that needs to be imparted to an electron on metal surface in order to liberate it.
G= 6.67 * 10?¹¹ Nm²/kg²

2. Correction factor for wavelength in a diffraction experiment (probably don't have to know)
?= 4L + 1.6d
Law of inertia. Object in motion stays in motion unless acted upon by an outside force.
Minimum frequency that needs to illuminate a metal surface for photoELECTRONS to be emitted
PE=mgh

3. If speed is high - index of refraction is....
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)
A= A0 e ^ [-?t] (= activity at time t=0 e ^ ( - decay constant * time)
Low
(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)

4. What is the apparent weight of a floating object?
Induced current will flow opposite direction of magnetic flux.
M= -di/do (=-hi/ho)
KE=1/2mv²
Zero.

5. Buoyant force formula
Fb= mass of displaced fluid * gravity
Threshold frequency=F/h (= work functions/planck's constant)
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)
PV/nT'= p'V'n'T' (p=pressure - V= VOLUME - T= temperature)

6. Work formula
KE= (Y-1)mc² (= (Y-1)E)
Etotal= E rest + KE= mc² + (Y-1)mc²
W=(Force parallel)(distance)= Pressure ? V (change in volume)= qvoltage
PEspring= 1/2 kx² (K is spring constant - X is distance spring compressed)

7. Beat frequency
W=qVoltage. (think C* J/C and C's cancel out)
Beat frequency= |F1-F2|
N= C/velocity.
Minimal energy that needs to be imparted to an electron on metal surface in order to liberate it.

8. Newton's second law
Fnet=ma
C= Q/V = e0 *A/d
I=mr²
P=mv (?p=m?v)

9. Law of refraction
4.14 10?¹5 eVs
(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)
?IE= - W (work)
Ni sin?i=nrsin?r

10. mass of a proton/neutron (there's a slight difference but ignore it - neutron has slightly more mass)
F=ILBsin? (?= angle btw. L and B)
Fingers= Magnetic Field - Thumb=Velocity - Palm of hand= Force. RH=Proton - LH= electron.
Eff= 1- Qc/Qh = 1- Tc/Th
1.67*10?²7kg

11. Elastic potential energy for a spring formula
E=hf (= Planck's constant*frequency)
?Tstationary= Y (?Tmoving)
PEspring= 1/2 kx² (K is spring constant - X is distance spring compressed)
Neutron --> Proton + electron ( + electron-antineutrino - V with line over it) ( °?1e produced)

12. Formula for electric field?
E= kq/r² (= f/q)
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)
4.14 10?¹5 eVs
1/f= 1/di + 1/do

13. Sign of focus for concave lens?
Apparent weight = Fb- weight= (mfg) - (m0g) = (mass of displaced fluid gravity) - (initial mass of object while hanging in air gravity) = (DfVfg)- (DoVog)
PV/nT'= p'V'n'T' (p=pressure - V= VOLUME - T= temperature)
Positive - focus in front of the lens (=real image)
KE=1/2mv²

14. What is the photoelectric effect?
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)
The release of electrons due to bombardment of an atom by photons (groups of quanta/bundles of matter)
Minimal energy that needs to be imparted to an electron on metal surface in order to liberate it.
Y= 1/ v(1-(v/c)²)

15. Planck's constant in J*s?
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)
6.6310 ?³4 Js
Etotal= E rest + KE= mc² + (Y-1)mc²

16. Capacitance formula? (there are two)
C= Q/V = e0 *A/d
The incident angle at which total internal reflection occurs (use ?r=90°)
W= - kq1q2 (1/r2 - 1/r1)
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)

17. 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)
(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)
PV/nT'= p'V'n'T' (p=pressure - V= VOLUME - T= temperature)
1/f= 1/di + 1/do

18. Power formula?
V= 331 m/s + (.6 m/s°C)Temperature
?Tstationary= Y (?Tmoving)
P=IV=I²R=V² /R = Fd/t= Force*velocity
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)

19. Relativistic formula for velocity
Shorter ? - less diffraction - bigger shadow.
Large/high
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)
Fb= Bperp-to-areaAcos? (Measures density of magnetic field lines that cross through an area)

20. Converting Fahrenheit to Celsius
F= (9/5)C+ 32
PE= 1/2 C (?V)² = 1/2 Q²/C = 1/2 Q?V
Intensity a Amplitude/ d²
The volume of the object.

21. Work performed by charge displacement? (hopefully...won't have to know)
Length stationary=Length moving/Y
Q=mc?T (where T is temperature)
W= - kq1q2 (1/r2 - 1/r1)
Voltage=PE/q (remember Joules/Coulomb= volt)

22. Law of reflection
6.6310 ?³4 Js
Shorter ? - less diffraction - bigger shadow.
Angle of incidence=Angle of reflection
Y= 1/ v(1-(v/c)²)

23. Moment of Inertia (a.k.a. rotational mass)
V=IR
A=v²/ r
R= ?L/A = (resistivity)(length of wire) / (cross sectional Area)
I=mr²

24. Binding energy formula
G= 6.67 * 10?¹¹ Nm²/kg²
Beat frequency= |F1-F2|
Ebinding= ?m * c² (= (?m)c²)
V= 331 m/s + (.6 m/s°C)Temperature

25. Heat formula
KE=1/2mv²
Q=mc?T (where T is temperature)
Shorter ? - less diffraction - bigger shadow.
G= 6.67 * 10?¹¹ Nm²/kg²

26. Formula for electric potential energy?
Longer ? - larger diffraction - smaller shadow.
Angle of incidence=Angle of reflection
W= - kq1q2 (1/r2 - 1/r1)
PE= 1/2 C (?V)² = 1/2 Q²/C = 1/2 Q?V

27. Activity of a radioactive sample formula? (probably don't have to know)
Etotal= E rest + KE= mc² + (Y-1)mc²
PE= 1/2 C (?V)² = 1/2 Q²/C = 1/2 Q?V
Low
A= A0 e ^ [-?t] (= activity at time t=0 e ^ ( - decay constant * time)

28. Efficiency of an engine formula
1/f= 1/di + 1/do
?=h/p (where p= MOMENTUM=m?v - and h is planck's constant)
1.67*10?²7kg
Eff= 1- Qc/Qh = 1- Tc/Th

29. magnitude of charge on electron/proton
Induced current will flow opposite direction of magnetic flux.
Threshold frequency=F/h (= work functions/planck's constant)
1.6*10?¹? C
S= 1/2at² + v0t+ d0 (intial distance is often ignored because we decide where we want to start)

30. Threshold frequency formula?

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31. Thin lens equation
Vfinal= V0 +at
C= Q/V = e0 *A/d
(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)
1/f= 1/di + 1/do

32. Planck's constant in electronvolts* seconds?
1/f= 1/di + 1/do
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.
4.14 10?¹5 eVs

33. Faraday's law
Positive - focus in front of the lens (=real image)
I=mr²
E0= 8.85 * 10?¹² C²/(Nm²)
EMFavg. induced= -?Fb/ ?t (= - change in mag flux/change in time)

34. Kinetic Energy formula
?p=f?t (where f is AVERAGE force and t is how long force is applied)
KE=1/2mv²
(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)
S= 1/2at² + v0t+ d0 (intial distance is often ignored because we decide where we want to start)

35. Voltage formula (for circuit - etc.)
M= -di/do (=-hi/ho)
V=IR
?Tstationary= Y (?Tmoving)
Zero.

36. Electric force formula? (two)
For every action there is an equal and opposite reaction
Felec=qE=[kq1q2]/r²
F=mv²/ r
?IE= - W (work)

37. Relativistic formula for time
P=IV=I²R=V² /R = Fd/t= Force*velocity
?Tstationary= Y (?Tmoving)
Intensity a Amplitude/ d²
931MeV=1amu

38. Voltage formula (think units of volts are what?) (NOT in terms of I and R)
Fb= mass of displaced fluid * gravity
E0= 8.85 * 10?¹² C²/(Nm²)
Voltage=PE/q (remember Joules/Coulomb= volt)
Etotal= E rest + KE= mc² + (Y-1)mc²

39. Momentum formula?
Negative - focus behind the lens (= virtual image)
P=mv (?p=m?v)
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)
Apparent weight = Fb- weight= (mfg) - (m0g) = (mass of displaced fluid gravity) - (initial mass of object while hanging in air gravity) = (DfVfg)- (DoVog)

40. Relativistic formula for length
Neutron --> Proton + electron ( + electron-antineutrino - V with line over it) ( °?1e produced)
Length stationary=Length moving/Y
F=GM1M2/r²
P=IV=I²R=V² /R = Fd/t= Force*velocity

41. Maximum KE with which an emitted electron leaves is...?
W= - kq1q2 (1/r2 - 1/r1)
KEmax= hf-F (= E-F= Energy of a photon - work function)
N= C/velocity.
Intensity a Amplitude/ d²

42. Ideal gas law
M= -di/do (=-hi/ho)
En= [Z²/n² * -13.6ev ] (Z is number of protons in atom's nucleus - n is energy level number)
N= C/velocity.
PV=nRT (p= pressure - V= volume - n= number of moles - T= temperature in KELVIN - R= .0821)

43. Transformer formula

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44. Magnetic force formula (for wire)?
Intensity a Amplitude/ d²
F=ILBsin? (?= angle btw. L and B)
Shorter ? - less diffraction - bigger shadow.
M= -di/do (=-hi/ho)

45. 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
Torque=force perpendicular to radius r = fr Toruqe=Ia = inertia * angular acceleration
I=mr²

46. Low frequency waves have...
F= n * vel/2L n= 1 - 2 - 3... (L= length of pipe) (?=2L/n)
Longer ? - larger diffraction - smaller shadow.
V=f?
K= 9 * 10? Nm²/C²

47. ß? decay?
?IE= - W (work)
The incident angle at which total internal reflection occurs (use ?r=90°)
Proton--> Neutron + positron (+ electron-neutrino - v) (° +1 e is produced)
Threshold frequency=F/h (= work functions/planck's constant)

48. Internal energy....equals?
K= 9 * 10? Nm²/C²
Shorter ? - less diffraction - bigger shadow.
?IE= - W (work)
Fingers= Magnetic Field - Thumb=Velocity - Palm of hand= Force. RH=Proton - LH= electron.

49. deBroglie wavelength explanation
P=IV=I²R=V² /R = Fd/t= Force*velocity
Particles in motion can display wave characteristics - and behave as if they had wavelength (?= h/p)
W= - kq1q2 (1/r2 - 1/r1)
KE=1/2mv²

50. Total KE formula
F=ILBsin? (?= angle btw. L and B)
Threshold frequency=F/h (= work functions/planck's constant)
Etotal= E rest + KE= mc² + (Y-1)mc²
Torque=force perpendicular to radius r = fr Toruqe=Ia = inertia * angular acceleration