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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. What is the apparent weight of a floating object?
Zero.
V=f?
Apparent weight = Fb- weight= (mfg) - (m0g) = (mass of displaced fluid gravity) - (initial mass of object while hanging in air gravity) = (DfVfg)- (DoVog)
Minimal energy that needs to be imparted to an electron on metal surface in order to liberate it.

2. Planck's constant in electronvolts* seconds?
4.14 10?¹5 eVs
The release of electrons due to bombardment of an atom by photons (groups of quanta/bundles of matter)
?V2/?V1= N2/N1 (if secondary greater than primary it's a step-up transformer).
Distance= velocity * time

3. If you drop an object into water the volume displaced equals...
E= V/d
The volume of the object.
Fb= Bperp-to-areaAcos? (Measures density of magnetic field lines that cross through an area)
Apparent weight = Fb- weight= (mfg) - (m0g) = (mass of displaced fluid gravity) - (initial mass of object while hanging in air gravity) = (DfVfg)- (DoVog)

4. Formula for magnetic flux?
Negative - focus behind the lens (= virtual image)
Fb= Bperp-to-areaAcos? (Measures density of magnetic field lines that cross through an area)
I=mr²
Induced current will flow opposite direction of magnetic flux.

5. Sign of focus for concave lens?
PE=mgh
PV/nT'= p'V'n'T' (p=pressure - V= VOLUME - T= temperature)
Positive - focus in front of the lens (=real image)
Distance= velocity * time

6. Work function F is..?
931MeV=1amu
Minimal energy that needs to be imparted to an electron on metal surface in order to liberate it.
Particles in motion can display wave characteristics - and behave as if they had wavelength (?= h/p)
Momentum is always conserved in the absence of an outside force

7. Velocity formula if time not given
Q= [(mass of A + mass of B) - (mass of C + mass of D)] c² (where A+B-->C+D)
Eff= 1- Qc/Qh = 1- Tc/Th
?IE= - W (work)
Vfinal²=V0²+ 2ad

8. Beat frequency
Beat frequency= |F1-F2|
The incident angle at which total internal reflection occurs (use ?r=90°)
V=IR
Q= [(mass of A + mass of B) - (mass of C + mass of D)] c² (where A+B-->C+D)

9. energy in a reaction q formula?
Q= [(mass of A + mass of B) - (mass of C + mass of D)] c² (where A+B-->C+D)
1.6*10?¹? C
Neutron --> Proton + electron ( + electron-antineutrino - V with line over it) ( °?1e produced)
Distance= velocity * time

10. Planck's constant in J*s?
PE=mgh
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)
6.6310 ?³4 Js

11. Relativistic formula for (kinetic) energy
Ebinding= ?m * c² (= (?m)c²)
KE= (Y-1)mc² (= (Y-1)E)
Threshold frequency=F/h (= work functions/planck's constant)
Felec=qE=[kq1q2]/r²

12. Thin lens equation
1/f= 1/di + 1/do
A= A0 e ^ [-?t] (= activity at time t=0 e ^ ( - decay constant * time)
Vfinal= V0 +at
Shorter ? - less diffraction - bigger shadow.

13. Capacitance formula? (there are two)
Fb= Bperp-to-areaAcos? (Measures density of magnetic field lines that cross through an area)
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=nRT (p= pressure - V= volume - n= number of moles - T= temperature in KELVIN - R= .0821)
C= Q/V = e0 *A/d

14. Formula for energy of a photon?

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15. mass of a proton/neutron (there's a slight difference but ignore it - neutron has slightly more mass)
1.67*10?²7kg
Felec=qE=[kq1q2]/r²
?=h/p (where p= MOMENTUM=m?v - and h is planck's constant)
E= V/d

16. High frequency wave shave...
Shorter ? - less diffraction - bigger shadow.
Minimum frequency that needs to illuminate a metal surface for photoELECTRONS to be emitted
F= n * vel./ 4L n= 1 - 3 - 5.... (L= length of pipe) (?=4L/n)
Energy it takes to break a nucleus into separate protons and neutrons (same as energy lost to create atom.)

17. Capacitance constant
Zero.
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)
The release of electrons due to bombardment of an atom by photons (groups of quanta/bundles of matter)

18. Total KE formula
Etotal= E rest + KE= mc² + (Y-1)mc²
931MeV=1amu
Threshold frequency=F/h (= work functions/planck's constant)
Fingers= Magnetic Field - Thumb=Velocity - Palm of hand= Force. RH=Proton - LH= electron.

19. Threshold frequency explanation?
Product of each lens's magnification
Minimum frequency that needs to illuminate a metal surface for photoELECTRONS to be emitted
G= 6.67 * 10?¹¹ Nm²/kg²
Fb= Bperp-to-areaAcos? (Measures density of magnetic field lines that cross through an area)

20. Apparent weight (weight of submerged object)
1/f= 1/di + 1/do
Eff= 1- Qc/Qh = 1- Tc/Th
F= n * vel./ 4L n= 1 - 3 - 5.... (L= length of pipe) (?=4L/n)
Apparent weight = Fb- weight= (mfg) - (m0g) = (mass of displaced fluid gravity) - (initial mass of object while hanging in air gravity) = (DfVfg)- (DoVog)

21. Lenz's law
Y= 1/ v(1-(v/c)²)
Induced current will flow opposite direction of magnetic flux.
F=ILBsin? (?= angle btw. L and B)
Neutron --> Proton + electron ( + electron-antineutrino - V with line over it) ( °?1e produced)

22. Voltage formula (for circuit - etc.)
Large/high
Energy it takes to break a nucleus into separate protons and neutrons (same as energy lost to create atom.)
V=IR
Felec=qE=[kq1q2]/r²

23. Potential Energy formula
Positive - focus in front of the lens (=real image)
?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.)
PE=mgh

24. New/old gas formula?

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25. Kinetic Energy formula
W=qVoltage. (think C* J/C and C's cancel out)
KE=1/2mv²
Longer ? - larger diffraction - smaller shadow.
K= 9 * 10? Nm²/C²

26. Conversion factor from atomic mass units to MeV?
Distance= velocity * time
931MeV=1amu
Angle of incidence=Angle of reflection
W=qVoltage. (think C* J/C and C's cancel out)

27. (Full) Displacement formula
S= 1/2at² + v0t+ d0 (intial distance is often ignored because we decide where we want to start)
K= 9 * 10? Nm²/C²
1.67*10?²7kg
I=mr²

28. Elastic potential energy for a spring formula
En= [Z²/n² * -13.6ev ] (Z is number of protons in atom's nucleus - n is energy level number)
Eff= 1- Qc/Qh = 1- Tc/Th
PEspring= 1/2 kx² (K is spring constant - X is distance spring compressed)
C= 3*108 m/s

29. Formula for diffraction pattern - Anti-node to node (A-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)
PE= 1/2 C (?V)² = 1/2 Q²/C = 1/2 Q?V
1.67*10?²7kg
Y= 1/ v(1-(v/c)²)

30. Formula for resistance of an OBJECT
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)
F=GM1M2/r²
R= ?L/A = (resistivity)(length of wire) / (cross sectional Area)
Negative - focus behind the lens (= virtual image)

31. Formula for velocity of waves?
Shorter ? - less diffraction - bigger shadow.
W=qVoltage. (think C* J/C and C's cancel out)
V=f?
Distance= velocity * time

32. Electric field between two plates formula?
Longer ? - larger diffraction - smaller shadow.
E= V/d
?=h/p (where p= MOMENTUM=m?v - and h is planck's constant)
A=v²/ r

33. What is the photoelectric effect?
1.67*10?²7kg
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
Y= 1/ v(1-(v/c)²)

34. Formula for how velocity changes in air? (probably don't have to know)
Felec=qE=[kq1q2]/r²
M= -di/do (=-hi/ho)
V= 331 m/s + (.6 m/s°C)Temperature
R= ?L/A = (resistivity)(length of wire) / (cross sectional Area)

35. Low frequency waves have...
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)
V=IR
Longer ? - larger diffraction - smaller shadow.
Threshold frequency=F/h (= work functions/planck's constant)

36. Newton's first law (Law of...)
Distance= velocity * time
?= 4L + 1.6d
The volume of the object.
Law of inertia. Object in motion stays in motion unless acted upon by an outside force.

37. If speed is slow/low - index of refraction is...
Angle of incidence=Angle of reflection
PE= 1/2 C (?V)² = 1/2 Q²/C = 1/2 Q?V
Atom + electron--> Neutron (the addition of an electron - °?1e - causes a proton to change into a neutron - i.e. PROTON TRANSFORMS)
Large/high

38. Buoyant force formula
Minimal energy that needs to be imparted to an electron on metal surface in order to liberate it.
Shorter ? - less diffraction - bigger shadow.
Fb= mass of displaced fluid * gravity
Q=mc?T (where T is temperature)

39. Work performed by charge displacement? (hopefully...won't have to know)
?=h/p (where p= MOMENTUM=m?v - and h is planck's constant)
Neutron --> Proton + electron ( + electron-antineutrino - V with line over it) ( °?1e produced)
W= - kq1q2 (1/r2 - 1/r1)
Threshold frequency=F/h (= work functions/planck's constant)

40. Formula for electric potential energy?
R= ?L/A = (resistivity)(length of wire) / (cross sectional Area)
PE= 1/2 C (?V)² = 1/2 Q²/C = 1/2 Q?V
C= 3*108 m/s
PE=mgh

41. Law of refraction
P=IV=I²R=V² /R = Fd/t= Force*velocity
P=mv (?p=m?v)
Y= 1/ v(1-(v/c)²)
Ni sin?i=nrsin?r

42. Ideal gas law
Positive - focus in front of the lens (=real image)
C= Q/V = e0 *A/d
F= n * vel./ 4L n= 1 - 3 - 5.... (L= length of pipe) (?=4L/n)
PV=nRT (p= pressure - V= volume - n= number of moles - T= temperature in KELVIN - R= .0821)

43. Relativistic factor Y formula
Y= 1/ v(1-(v/c)²)
Energy it takes to break a nucleus into separate protons and neutrons (same as energy lost to create atom.)
6.6310 ?³4 Js
E= V/d

44. Power formula?
R= ?L/A = (resistivity)(length of wire) / (cross sectional Area)
V= 331 m/s + (.6 m/s°C)Temperature
The release of electrons due to bombardment of an atom by photons (groups of quanta/bundles of matter)
P=IV=I²R=V² /R = Fd/t= Force*velocity

45. Mass defect explanation

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46. Newton's third law
F= n * vel/2L n= 1 - 2 - 3... (L= length of pipe) (?=2L/n)
For every action there is an equal and opposite reaction
4.14 10?¹5 eVs
S= 1/2at² + v0t+ d0 (intial distance is often ignored because we decide where we want to start)

47. K constant for electric field formula?
K= 9 * 10? Nm²/C²
?= 4L + 1.6d
S= 1/2at² + v0t+ d0 (intial distance is often ignored because we decide where we want to start)
1.67*10?²7kg

48. Law of reflection
P=mv (?p=m?v)
S= 1/2at² + v0t+ d0 (intial distance is often ignored because we decide where we want to start)
Intensity a Amplitude/ d²
Angle of incidence=Angle of reflection

49. deBrolglie wavelength formula

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50. Relativistic formula for length
Zero.
?Tstationary= Y (?Tmoving)
PE=mgh
Length stationary=Length moving/Y