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Flashcards in Physics Deck (19):
1

What is the equation for the energy of a photon of light?

E=hf=hc/λ (J/photon)

2

What is Plank’s constant?

h=6.62 x 10^-34 Js

3

What is the equation for the speed of light?

c=fλ= 3 x 10^8

4

What direction to negatively charged particles move in an electric field?

Opposite direction of electric field lines

5

What is the equation for electric field produced by source charge Q?

E= kQ/r^2
direction= direction a +q would move in presence of source charge Q

6

What is the equation for electrostatic force between 2 charges q and Q?

F=kQq/r^2

7

What is the equation for electric potential energy?

U=kQq/r

8

What is the equation for electric potential?

V=kQ/r
Electrons moves from higher potential (+) to lower potential (-)

9

What is the value of k, Coulomb's constant?

k=8.99 X 10^9 Nm/C^2

10

What is the unit conversion for pressures?

1.013x10^5Pa = 760 mmHg = 760 torr = 1 atm

11

What is the equation for the charge stored in a capacitor?

Q=VC

12

What is the equation for capacitance?

C=ake/d

13

What is the energy stored in a capacitor?

U=1/2QV^2 = 1/2CV^2 = Q^2/2C

14

When the battery is connected to the capacitor...

V= constant; Q= changing

15

When the battery is disconnected to the capacitor...

V= changing; Q= constant
Begin to discharge--> both start changing

16

Sound Intensity

I= 10dblog(I/Io) Io= 10^-12
multiplying by 10= +10dB
dividing by 10= -10dB
multiplying by 1000= +30dB
sound waves spread out in all direction in a surrounding sphere; sound intensity decreases by a factor of r^2

17

What is Hooke's Law?

(restoring force) F= kx
F vs displacement (x) is a linear relationship with k= slope

18

What is the potential energy in a spring?

PE= 1/2kx^2

19

G(unit)=

10^9