SAT Subject Test: Physics Formulas

Instructions:

• Answer 50 questions in 15 minutes.
• If you are not ready to take this test, you can study here.
• 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. Elastic potential energy for a spring formula
Shorter ? - less diffraction - bigger shadow.
PEspring= 1/2 kx² (K is spring constant - X is distance spring compressed)
F= n * vel./ 4L n= 1 - 3 - 5.... (L= length of pipe) (?=4L/n)
Fb= Bperp-to-areaAcos? (Measures density of magnetic field lines that cross through an area)


2. Relativistic formula for (kinetic) energy
KE= (Y-1)mc² (= (Y-1)E)
A=v²/ r
The volume of the object.
PV=nRT (p= pressure - V= volume - n= number of moles - T= temperature in KELVIN - R= .0821)


3. Threshold frequency explanation?
(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)
E= kq/r² (= f/q)
Minimum frequency that needs to illuminate a metal surface for photoELECTRONS to be emitted
Momentum is always conserved in the absence of an outside force


4. Work function F is..?
PE= 1/2 C (?V)² = 1/2 Q²/C = 1/2 Q?V
Eff= 1- Qc/Qh = 1- Tc/Th
Minimal energy that needs to be imparted to an electron on metal surface in order to liberate it.
?Tstationary= Y (?Tmoving)


5. Formula for electric potential energy?
Ebinding= ?m * c² (= (?m)c²)
EMFavg. induced= -?Fb/ ?t (= - change in mag flux/change in time)
C= 3*108 m/s
PE= 1/2 C (?V)² = 1/2 Q²/C = 1/2 Q?V


6. Light intensity is proportional to..
?p=f?t (where f is AVERAGE force and t is how long force is applied)
Intensity a Amplitude/ d²
K= 9 * 10? Nm²/C²
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)


7. If you drop an object into water the volume displaced equals...
The incident angle at which total internal reflection occurs (use ?r=90°)
The volume of the object.
PE= 1/2 C (?V)² = 1/2 Q²/C = 1/2 Q?V
Q=m*L (where L is the latent heat of fusion or vaporization)


8. Work formula
G= 6.67 * 10?¹¹ Nm²/kg²
PEspring= 1/2 kx² (K is spring constant - X is distance spring compressed)
6.6310 ?³4 Js
W=(Force parallel)(distance)= Pressure ? V (change in volume)= qvoltage


9. K constant for electric field formula?
Minimal energy that needs to be imparted to an electron on metal surface in order to liberate it.
?= 4L + 1.6d
C= Q/V = e0 *A/d
K= 9 * 10? Nm²/C²


10. Relativistic formula for length
Proton--> Neutron + positron (+ electron-neutrino - v) (° +1 e is produced)
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)
Length stationary=Length moving/Y
C= Q/V = e0 *A/d


11. Kinetic Energy formula
1.67*10?²7kg
PEspring= 1/2 kx² (K is spring constant - X is distance spring compressed)
(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)
KE=1/2mv²


12. Heat formula
Etotal= E rest + KE= mc² + (Y-1)mc²
Minimum frequency that needs to illuminate a metal surface for photoELECTRONS to be emitted
Q=mc?T (where T is temperature)
Vfinal²=V0²+ 2ad


13. Conversion factor from atomic mass units to MeV?
Atom + electron--> Neutron (the addition of an electron - °?1e - causes a proton to change into a neutron - i.e. PROTON TRANSFORMS)
I=mr²
Longer ? - larger diffraction - smaller shadow.
931MeV=1amu


14. Index of refraction formula
N= C/velocity.
PE=mgh
1/f= 1/di + 1/do
Voltage=PE/q (remember Joules/Coulomb= volt)


15. OPEN PIPE FREQUENCY (Frequency/Harmonic series of a pipe opened at both ends)
Minimum frequency that needs to illuminate a metal surface for photoELECTRONS to be emitted
F= n * vel/2L n= 1 - 2 - 3... (L= length of pipe) (?=2L/n)
4.14 10?¹5 eVs
Longer ? - larger diffraction - smaller shadow.


16. Mass defect explanation

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17. Relativistic factor Y formula
?p=f?t (where f is AVERAGE force and t is how long force is applied)
(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)
Y= 1/ v(1-(v/c)²)
Etotal= E rest + KE= mc² + (Y-1)mc²


18. Heat of fusion/vaporization fromula
?IE= - W (work)
Q=m*L (where L is the latent heat of fusion or vaporization)
EMFavg. induced= -?Fb/ ?t (= - change in mag flux/change in time)
PV=nRT (p= pressure - V= volume - n= number of moles - T= temperature in KELVIN - R= .0821)


19. ß? decay?
Large/high
Proton--> Neutron + positron (+ electron-neutrino - v) (° +1 e is produced)
Threshold frequency=F/h (= work functions/planck's constant)
1.6*10?¹? C


20. Conservation of momentum
KE=1/2mv²
F=ILBsin? (?= angle btw. L and B)
Momentum is always conserved in the absence of an outside force
Fb= Bperp-to-areaAcos? (Measures density of magnetic field lines that cross through an area)


21. High frequency wave shave...
Shorter ? - less diffraction - bigger shadow.
A=v²/ r
Q= [(mass of A + mass of B) - (mass of C + mass of D)] c² (where A+B-->C+D)
Large/high


22. Electric force formula? (two)
W= - kq1q2 (1/r2 - 1/r1)
Felec=qE=[kq1q2]/r²
For every action there is an equal and opposite reaction
F=GM1M2/r²


23. Planck's constant in J*s?
G= 6.67 * 10?¹¹ Nm²/kg²
C= Q/V = e0 *A/d
1/f= 1/di + 1/do
6.6310 ?³4 Js


24. Maximum KE with which an emitted electron leaves is...?
Angle of incidence=Angle of reflection
W=(Force parallel)(distance)= Pressure ? V (change in volume)= qvoltage
Eff= 1- Qc/Qh = 1- Tc/Th
KEmax= hf-F (= E-F= Energy of a photon - work function)


25. Sign of focus for convex lens?
Q=m*L (where L is the latent heat of fusion or vaporization)
Negative - focus behind the lens (= virtual image)
1.6*10?¹? C
V= 331 m/s + (.6 m/s°C)Temperature


26. Formula for electric field?
F=ILBsin? (?= angle btw. L and B)
The volume of the object.
E= kq/r² (= f/q)
?p=f?t (where f is AVERAGE force and t is how long force is applied)


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

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28. Law of reflection
KE=1/2mv²
Angle of incidence=Angle of reflection
Intensity a Amplitude/ d²
Longer ? - larger diffraction - smaller shadow.


29. mass of a proton/neutron (there's a slight difference but ignore it - neutron has slightly more mass)
Shorter ? - less diffraction - bigger shadow.
Fb= mass of displaced fluid * gravity
1.67*10?²7kg
KE= (Y-1)mc² (= (Y-1)E)


30. Electron capture
EMFavg. induced= -?Fb/ ?t (= - change in mag flux/change in time)
M= -di/do (=-hi/ho)
Atom + electron--> Neutron (the addition of an electron - °?1e - causes a proton to change into a neutron - i.e. PROTON TRANSFORMS)
Energy of emitted photon = E2-E1 (=Energy level higher- Energy level lower)


31. ONE END CAPPED PIPE FREQUENCY (Frequency/Harmonic series of a pipe closed at one ned)
EMFavg. induced= -?Fb/ ?t (= - change in mag flux/change in time)
F= n * vel./ 4L n= 1 - 3 - 5.... (L= length of pipe) (?=4L/n)
?=h/p (where p= MOMENTUM=m?v - and h is planck's constant)
F= n * vel/2L n= 1 - 2 - 3... (L= length of pipe) (?=2L/n)


32. Capacitance constant
Energy it takes to break a nucleus into separate protons and neutrons (same as energy lost to create atom.)
E0= 8.85 * 10?¹² C²/(Nm²)
E= V/d
I=mr²


33. Impulse formula
?p=f?t (where f is AVERAGE force and t is how long force is applied)
F= (9/5)C+ 32
The release of electrons due to bombardment of an atom by photons (groups of quanta/bundles of matter)
Negative - focus behind the lens (= virtual image)


34. Magnetic force formula (for particle)?
I=mr²
Ebinding= ?m * c² (= (?m)c²)
Force magnetic= |q|vBsin? (=qVperpendicularB) (?= angle between v and B)
Induced current will flow opposite direction of magnetic flux.


35. How to find total magnification?

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36. Law of refraction
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)
PEspring= 1/2 kx² (K is spring constant - X is distance spring compressed)
Ni sin?i=nrsin?r


37. Threshold frequency formula?

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38. deBrolglie wavelength formula

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39. Energy of an emitted photon formula?
Particles in motion can display wave characteristics - and behave as if they had wavelength (?= h/p)
Energy of emitted photon = E2-E1 (=Energy level higher- Energy level lower)
Apparent weight = Fb- weight= (mfg) - (m0g) = (mass of displaced fluid gravity) - (initial mass of object while hanging in air gravity) = (DfVfg)- (DoVog)
The release of electrons due to bombardment of an atom by photons (groups of quanta/bundles of matter)


40. Binding energy formula
K= 9 * 10? Nm²/C²
C= Q/V = e0 *A/d
EMFavg. induced= -?Fb/ ?t (= - change in mag flux/change in time)
Ebinding= ?m * c² (= (?m)c²)


41. Planck's constant in electronvolts* seconds?
PEspring= 1/2 kx² (K is spring constant - X is distance spring compressed)
Ni sin?i=nrsin?r
?p=f?t (where f is AVERAGE force and t is how long force is applied)
4.14 10?¹5 eVs


42. Sign of focus for concave lens?
Longer ? - larger diffraction - smaller shadow.
E=hf (= Planck's constant*frequency)
Positive - focus in front of the lens (=real image)
E0= 8.85 * 10?¹² C²/(Nm²)


43. Low frequency waves have...
Q=mc?T (where T is temperature)
Atom + electron--> Neutron (the addition of an electron - °?1e - causes a proton to change into a neutron - i.e. PROTON TRANSFORMS)
?p=f?t (where f is AVERAGE force and t is how long force is applied)
Longer ? - larger diffraction - smaller shadow.


44. New/old gas formula?

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45. Potential Energy formula
PE=mgh
Proton--> Neutron + positron (+ electron-neutrino - v) (° +1 e is produced)
PEspring= 1/2 kx² (K is spring constant - X is distance spring compressed)
V= 331 m/s + (.6 m/s°C)Temperature


46. Internal energy....equals?
4.14 10?¹5 eVs
?IE= - W (work)
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)
EMFavg. induced= -?Fb/ ?t (= - change in mag flux/change in time)


47. Lenz's law
Atom + electron--> Neutron (the addition of an electron - °?1e - causes a proton to change into a neutron - i.e. PROTON TRANSFORMS)
PE=mgh
F= n * vel./ 4L n= 1 - 3 - 5.... (L= length of pipe) (?=4L/n)
Induced current will flow opposite direction of magnetic flux.


48. Newton's second law
Energy it takes to break a nucleus into separate protons and neutrons (same as energy lost to create atom.)
Fnet=ma
E= kq/r² (= f/q)
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)


49. Electric field between two plates formula?
PE=mgh
P=mv (?p=m?v)
E= V/d
Voltage=PE/q (remember Joules/Coulomb= volt)


50. Moment of Inertia (a.k.a. rotational mass)
(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)
W=qVoltage. (think C* J/C and C's cancel out)
C= 3*108 m/s
I=mr²