Q: A ray of light passes from air ($$n_1 = 1.00$) into water (n_2$ = 1.33) at an $$angle of $$30^ ext{o} to $$the normal. What is the angle of refraction in the water? Use Snell's Law: $$n_1$$ \sin \$$theta_1$$ = $$n_2$$ \sin \$$theta_2.$$

$$\$$theta_2$$ \approx 22.1^\text{o}$$

Q: A light ray passes from glass ($$n = 1.5) $$into air ($$n = 1.0) at an $$angle of $$45^\text{o} to $$the normal. What is the angle of refraction in air?

$$\$$theta_2$$ \approx 72.5^\text{o}$$

Question 1

Which of the following best describes the phenomenon of constructive interference in wave optics?

Accepted Answer

When two waves meet and their amplitudes add, resulting in a higher amplitude.

Question 2

A ray of light passes from air ($$n_1 = 1.00$) into water (n_2$ = 1.33) at an $$angle of $$30^	ext{o} to $$the normal. What is the angle of refraction in the water? Use Snell's Law: $$n_1$$ \sin \$$theta_1$$ = $$n_2$$ \sin \$$theta_2.$$

Accepted Answer

$$\$$theta_2$$ \approx 22.1^	ext{o}$$

Question 3

Which equation correctly expresses Coulomb's Law for the force between two point charges $$q_1$$ and $$q_2$$ separated by distance $$r$$?

Accepted Answer

$$F = k_e \frac{q_1$ q_2$}{r^2$}$$

Question 4

A resistor ($$R = 10\ \Omega) $$and a capacitor ($$C = 100\ \mu	ext{F}) $$are connected in series to a $$12\ 	ext{V}$$ battery. What is the initial current when the circuit is first closed?

Accepted Answer

$$I_0 = 1.2$$\ 	ext{A}$$

Question 5

Which of the following best describes the effect of a magnetic field on a moving charge?

Accepted Answer

The charge experiences a force perpendicular to both its velocity and the magnetic field.

Question 6

A wire of length $$0.5\ 	ext{m}$$ moves at $$2\ 	ext{m/s}$$ perpendicular to a magnetic field of $$0.3\ 	ext{T}. $$What is the induced emf across the ends of the wire? Use $$	ext{emf} = B \ell v.$$

Accepted Answer

$$0.15\ 	ext{V}$$

Question 7

Which of the following is NOT a property of electromagnetic waves?

Accepted Answer

They require a medium to propagate.

Question 8

Which region of the electromagnetic spectrum has the shortest wavelength?

Accepted Answer

Gamma rays

Question 9

A transformer increases the voltage from $$120\ 	ext{V} to$$ $$480\ 	ext{V}. If $$the primary coil has $$200$$ turns, how many turns are in the secondary coil? Use $$\frac{V_s}{V_p} = \frac{N_s}{N_p}.$$

Accepted Answer

$$800$$ turns

Question 10

Which equation represents Einstein’s mass-energy equivalence?

Accepted Answer

$$E = mc^2$

Question 11

A $$5\ \mu	ext{C}$$ charge is placed in an electric field of $$2000\ 	ext{N/C}. $$What is the force on the charge?

Accepted Answer

$$0.01\ 	ext{N}$$

Question 12

Which of the following best describes the photoelectric effect?

Accepted Answer

Electrons are emitted from a metal surface when it is exposed to light of sufficient frequency.

Question 13

A circuit contains a $$12\ 	ext{V}$$ battery and two resistors ($$R_1 = 4$$\ \Omega$$, R_2$ = 8\ \Omega) in $$series. What is the total current in the circuit?

Accepted Answer

$$1\ 	ext{A}$$

Question 14

Which of the following is a correct statement about Faraday’s Law of Induction?

Accepted Answer

A changing magnetic field induces an emf in a circuit.

Question 15

A light ray passes from glass ($$n = 1.5) $$into air ($$n = 1.0) at an $$angle of $$45^	ext{o} to $$the normal. What is the angle of refraction in air?

Accepted Answer

$$\$$theta_2$$ \approx 72.5^	ext{o}$$

Question 16

Which of the following is true about the speed of light in different media?

Accepted Answer

The speed of light is slower in glass than in air.

Question 17

A $$2\ 	ext{A}$$ current flows through a $$6\ \Omega$$ resistor. What is the power dissipated by the resistor?

Accepted Answer

$$24\ 	ext{W}$$

Question 18

Which of the following is a correct statement about the polarization of light?

Accepted Answer

Polarization refers to the orientation of the electric field vector in a light wave.

Question 19

A charged particle moves in a circle in a uniform magnetic field. Which force is responsible for this motion?

Accepted Answer

The magnetic force acts as a centripetal force.

Question 20

Which of the following best describes the relationship between frequency ($$f) $$and wavelength ($$\lambda) $$for electromagnetic waves in a vacuum?

Accepted Answer

$$c = f \lambda$$

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