Physics 2 Final

Two charges are separated by a distance d=1.5cm. It is observed that the force between then is 2N. then the two charges are transferred from air (dielectric constant 1.00) to oil (dielectric constant (4.0). If the separation between charges is kept the same, what is the new force between them?

a. 2N

b. 2,8 × 10^-11 N

c. 4.4 × 10^ -10 N

d. 0.5N

e. 8N

0.5N

Which of the following is true about point P located at the midpoint between two identical charges

a. V=0 E=0

b. V=0 E=/ 0

c. V=/ 0 E=0

d. V=/ 0 E=/ 0

e. none of these

c. V=/ 0 E=0

Which set of units is equivalent to V/N, where V is a volt and N is a newton.

a. m²/s

b. m/C

c. JC

d. kg/s

e. kg/c

m/C

Two charges are separated by a distance d and attract each other with a force F. What distance should the charges be brought to in order to get a force 2F

a. 4d

b. 2d

c. d/sqrt. 2

d. d/2

e. d/4

d/ sqrt. 2

Exam 1 question 9, 10

Equipotential lines:

a. point toward positive charges

b. run parallel to electric field lines

c. point toward lower potentials

d. indicate the direction of force on protons

e. are perpendicular to electric field lines

are perpendicular to electric field lines

Exam 2 question 1, 2

A battery is hooked up to a simple resistor and the current is measured to be I. Now the resistor is removed and replaced with one that has three time the resistance. What is the current through the new circuit?

a. 9I

b. 3I

c. I

d. I/3

e. I/9

d. I/3

A parallel plate capacitor has plates with size A that are separated by a distance d and is charged to a voltage V. If the plate area is increased to 2A at constant voltage, which of the following statements describes the changes to the capacitor?

a. the charge on the plates and the capacitance both increase

b. the charge on the plates increase but the capacitance decreases

c. the charge on the plates decrease but the capacitance increases

d. the charge on the plates and the capacitance both decrease

e. the charge on the plates and the capacitance are both unchanged

a. The charge on the plates and the capacitance both increase

In an AC circuit, which on the following quantities is not zero

a. Average current

b. average power

c. average voltage

d. A and B

e. All three are zero

Average power

Exam 2 question 11, 12, 13

Exam 3 question 2, 3, 4, 5, 6, 8, 10, 14

Which set of units are equivalent to a Tesla/Wb?

a. V/D

b. D²

c. AN

d. CJ

e. WD²

D²

A lens is made from glass with an index of refraction of n_g = 1.5. when the lens is in air (n_a = 1.0) the lens has a focal length of 0.5m. If the lens is submerged in water (n_w = 1.33) what will happen to the focal length?

a. the focal length will be shorter

b. the focal length will be longer

c. the focal length will be infinity

d. the lens will become a diverging lens

b. the focal length will be longer

Two metal rods are inserted into a hot fire five minutes apart and allowed to heat up. After the second rod has been in the fire for several minutes, both rods are removed. The rod that has been in the fire longer reaches a temperature of 6000K and appears to glow white. The rod that has been in less time is at 1000K and appears to glow red. Which rod emits more red photons and which emits more blue photons?

a. the 6000K rod emits more red and blue

b. the 1000K rod emits more red and blue

c. the 6000K rod emits more blue and the 1000K rod emits more red

d. the 6000K red emits more red and the 1000K rod emits more blue

the 6000K rod emits more red and blue

Exam 4 question 2, 6

A variety of lights of different wavelengths and intensities are used to illuminate a piece of metal. It is found that a light with a wavelength (lamda = 430 nm) and an intensity of I= 300W/m² is not quite able to remove electrons from the metal. Which set of illumination conditions will be best at removing electrons from the metal?

a. lamda = 530 nm, I = 300W/m²

b. lamda = 630 nm, I = 300W/m²

c. lamda = 430 nm, I = 600W/m²

d. lamda = 330 nm, I = 300 W/m²

e. lamda = 530 nm, I = 600W/m²

lamda = 330 nm, I = 300W/m²

Which of the following statements describes the “ionization energy”?

a. the energy emitted to move an electron to a higher energy state

b. the energy released when an electron absorbs a photon

c. the kinetic energy of an electron bound to an atom

d. the energy required to remove an electron from an atom

e. the energy required to bring an atom near an ion

the energy required to remove an electron from an atom

Balance the following fission reaction:

n + ²³^5_92U —> ^140_55 Cs + ^A_ZX +4n

a. A = 92, Z = 37

b. A = 90, Z = 37

c. A = 93, Z = 38

d. A = 92, Z = 38

e. A = 94, Z = 36

a. A = 92, Z = 37

You flip a coin once and draw a random card from a standard deck of 52 cards. What is the probability that you see a face on both the coin and the card?

a. ½

b. ¼

c. 3/26

d. 7/52

e. 1/104

1/104

Which of these is the biggest health risk

a. 5mGy with RBE of 20

b. 40mSv with an RBE of 3

c. 60mGy with an RBE of 0

d. 20 mSv with an RBE of 20

e. 70mGy with an RBE of 1

a. 5mGy with RBE of 20

Which of the following describes endothermic nuclear reactions

a. the binding energy increases

b. the total mass increases

c. the resulting nuclei will have more protons

d. the resulting nuclei will have fewer neutrons

e. energy is released

b. the total mass increases

Which of the following is not a true statement about ionizing energy radiation

a. radioactive decay is a source of ionizing radiation

b. ionizing radiation causes chemical damage

c. microwaves are ionizing radiation

d. photons cannot be ionizing radiation

e. ionizing radiation can damage biological tissue

photons cannot be ionizing radiation

Consider two states with the following energies and multiplicities:

State X: E_x = 25 × 10^-21 J, W_x = 2500

State Y: E_y = 8.0 × 10^-21 J, W_y = 15

At a certain temperature state y is twice as likely as state X. What needs to happen if you want to make state X more likely than state Y?

a. increase E_x

b. increase w_y

c, increase the temperature

d. increase the entropy of state Y

e. increase the free energy of state X

increase the free energy of state X

If everything else is unchanged, what is the effect of increasing the multiplicity of a macrostate?

a. the free energy increases and the probability of the macrostate increases

b. the free energy decreases and the probability of the macrostate increases

c. the free energy increases and the probability of the macrostate decreases

d. the free energy decreases and the probability of the macrostate decreases

e. there is no effect on the probability of the macrostate

the free energy decreases and the probability of the macrostate increases

Which statement is true about gamma decay

a. the resulting nucleus has fewer protons

b. the resulting nucleus has fewer neutrons

c. the resulting nucleus has more neutrons

d. the mass of the nucleus does not change

e. the radiation is massless

the radiation is massless

What units could be used to describe the product of K_BT/u, Where K_BT is Boltzmann’s constant, T is the absolute temperature, and u is the atomic mass unit (amu)?

a. J

b. V/T

c. ms

d. Am

e. M²/s²

m²/s²

Exam 5 question 10