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AP Physics 2 Easy practice

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Easy practice

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Question 1

Snell's law describes refraction at the interface between two media. If a ray travels from medium 1 (index $n_{1}$ ) into medium 2 (index $n_{2} > n_{1}$ ), what happens to the angle of refraction $θ_{2}$ compared to the angle of incidence $θ_{1}$ ?

θ_{2} > θ_{1}

(ray bends away from the normal)B.

θ_{2} < θ_{1}

(ray bends toward the normal)C.

θ_{2} = θ_{1}

(no bending occurs)D.

θ_{2} = 90°

(total internal reflection occurs)

Question 2

A gas undergoes an isothermal process. Which of the following is true about the change in internal energy $Δ U$ of an ideal gas during this process?

Δ U > 0

because work is done on the gas.B.

Δ U < 0

because the gas must release heat to maintain constant temperature.C.

Δ U = 0

because internal energy of an ideal gas depends only on temperature.D.

Δ U = Q

because no work is done during an isothermal process.

Question 3

In the photoelectric effect, which property of light determines the maximum kinetic energy of the ejected electrons?

A.The intensity (brightness) of the lightB.The frequency (or wavelength) of the lightC.The angle of incidence of the light on the metalD.The total duration of illumination

Question 4

An object is placed $30 cm$ in front of a concave mirror with focal length $f = 10 cm$ . Using the mirror equation $\frac{1}{f} = \frac{1}{d _{o}} + \frac{1}{d _{i}}$ , what is the image distance $d_{i}$ ?

d_{i} = - 15 cm

d_{i} = 15 cm

d_{i} = 20 cm

d_{i} = 40 cm

Question 5

A photon has a wavelength of $λ = 400 nm$ . What is its energy in electron-volts? ( $h = 6.63 \times 1 0^{- 34} J \cdot s$ , $c = 3 \times 1 0^{8} m/s$ , $1 eV = 1.6 \times 1 0^{- 19} J$ )

E \approx 1.24 eV

E \approx 3.1 eV

E \approx 6.2 eV

E \approx 0.31 eV

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Question 6

A proton moves with velocity $v$ in a magnetic field $B$ . The magnetic force on the proton is given by:

F = q v \cdot B

(dot product)B.

F = q v \times B

F = q B \times v

F = q v B

(parallel to

v

)

Question 7

A positive test charge $+ q$ is placed in an electric field $E$ . The electric force on the test charge is:

F = E / q

F = q E

, directed opposite to

E

since the charge is positive.C.

F = q E

, directed in the same direction as

E

.D.

F = q^{2} E

Question 8

The de Broglie wavelength of a particle with momentum $p$ is given by:

λ = h p

λ = h / p

λ = p / h

λ = h / E

where

E

is kinetic energy

Question 9

A rectangular loop of wire is placed in a uniform magnetic field $B$ pointing into the page. The loop lies in the plane of the page. If the magnetic flux through the loop is $Φ_{B} = B A$ where $A$ is the loop area, what is the induced EMF when the loop is stationary?

E = B A

E = B / A

E = 0

E = B^{2} A

Question 10

In the Bohr model of hydrogen, an electron transitions from energy level $n = 3$ to $n = 1$ . This transition results in:

A.The absorption of a photon with energy equal to

E_{3} - E_{1}

B.The emission of a photon with energy equal to

E_{3} - E_{1}

C.The emission of a photon with energy equal to

E_{1} - E_{3}

D.No photon is emitted; the electron just loses energy.

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Question 11

Two resistors, $R_{1} = 6 Ω$ and $R_{2} = 3 Ω$ , are connected in parallel across a battery. What is the equivalent resistance of the combination?

R_{eq} = 9 Ω

R_{eq} = 4.5 Ω

R_{eq} = 2 Ω

R_{eq} = 1 Ω

Question 12

A resistor has a current of $I = 3 A$ flowing through it and a voltage of $V = 12 V$ across it. What is its resistance?

R = 0.25 Ω

R = 4 Ω

R = 36 Ω

R = 9 Ω

Question 13

A long straight wire carries current $I$ to the right. A proton (positive charge) is located directly above the wire and is moving to the right (same direction as $I$ ). What is the direction of the magnetic force on the proton?

A.Upward, away from the wireB.Downward, toward the wireC.To the left, opposing the proton's motionD.Out of the page

Question 14

A $12 Ω$ resistor and an $8 Ω$ resistor are connected in series to a $20 V$ battery with negligible internal resistance. What is the voltage across the $8 Ω$ resistor?

V_{8} = 12 V

V_{8} = 8 V

V_{8} = 10 V

V_{8} = 20 V

Question 15

Lenz's law states that the direction of an induced current is such that it:

A.Enhances the change in magnetic flux that caused it.B.Is always clockwise when viewed from above.C.Opposes the change in magnetic flux that caused it.D.Is proportional to the magnitude of the magnetic field.

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