Circuits to OpticsJune 16, 2004

Which type of field is present near a moving Which type of field is present near a moving electric charge?electric charge?

(A) an electric field, only(A) an electric field, only(B) a magnetic field, only(B) a magnetic field, only(C) both an electric field and a magnetic field(C) both an electric field and a magnetic field(D) neither an electric field nor a magnetic (D) neither an electric field nor a magnetic

fieldfield

The electric circuit consists of a 12-volt The electric circuit consists of a 12-volt battery, a 3.0-ohm resistor, R1, and a variable battery, a 3.0-ohm resistor, R1, and a variable resistor, R2. At what value must the variable resistor, R2. At what value must the variable resistor be set to produce a current of 1.0 resistor be set to produce a current of 1.0 ampere through R1?ampere through R1?

(A) 6.0 Ω (A) 6.0 Ω (B) 3.0 Ω(B) 3.0 Ω(C) 9.0 Ω (C) 9.0 Ω (D) 12 Ω(D) 12 Ω

An electric bell connected to a battery is sealed An electric bell connected to a battery is sealed inside a large jar. What happens as the air is inside a large jar. What happens as the air is removed from the jar?removed from the jar?(A) The bell’s loudness increases because of (A) The bell’s loudness increases because of

decreased air resistance.decreased air resistance.(B) The bell’s loudness decreases because sound (B) The bell’s loudness decreases because sound

waves can waves can not not travel through a vacuum. travel through a vacuum. (C) The electric circuit stops working because (C) The electric circuit stops working because

electromagnetic radiation can electromagnetic radiation can not not travel travel through a vacuum.through a vacuum.

(D) The bell’s pitch decreases because the (D) The bell’s pitch decreases because the frequency of the sound waves is lower in a frequency of the sound waves is lower in a vacuum than in air.vacuum than in air.

As a sound wave passes from water, where the As a sound wave passes from water, where the speed is 1.49 × 10speed is 1.49 × 1033 meters per second, into air, the meters per second, into air, the wave’s speed wave’s speed

(A) decreases and its frequency remains the same(A) decreases and its frequency remains the same(B) increases and its frequency remains the same(B) increases and its frequency remains the same(C) remains the same and its frequency decreases(C) remains the same and its frequency decreases(D) remains the same and its frequency increases(D) remains the same and its frequency increases

Which phenomenon occurs when an object Which phenomenon occurs when an object absorbs wave energy that matches the object’s absorbs wave energy that matches the object’s natural frequency?natural frequency?

(A) reflection (A) reflection (B) resonance(B) resonance(C) diffraction (C) diffraction (D) interference(D) interference

Which wave diagram has Which wave diagram has both both wavelength (λ) wavelength (λ) and amplitude (and amplitude (AA) labeled correctly?) labeled correctly?

What is the total resistance of the circuit segment?

(A) 1.0 (B) 9.0 (C) 3.0 (D) 27

In the circuit diagram, what are the correct readings of voltmeters V1 and V2?(A) V1 reads 2.0 V and V2 reads 4.0 V (B) V1 reads 4.0 V and V2 reads 2.0 V (C) V1 reads 3.0 V and V2 reads 3.0 V (D) V1 reads 6.0 V and V2 reads 6.0 V

A 20-ohm resistor and a A 20-ohm resistor and a 30-ohm resistor are connected 30-ohm resistor are connected in parallel to a 12-volt battery as shown. An in parallel to a 12-volt battery as shown. An ammeter is connected as shown. What is the ammeter is connected as shown. What is the equivalent resistance of the circuit?equivalent resistance of the circuit?(A) 10. Ω (A) 10. Ω (B) 25 Ω(B) 25 Ω(C) 12 Ω (C) 12 Ω (D) 50. Ω(D) 50. Ω

A 20-ohm resistor and a A 20-ohm resistor and a 30-ohm resistor are connected 30-ohm resistor are connected in parallel to a 12-volt battery as shown. An in parallel to a 12-volt battery as shown. An ammeter is connected as shown. What is the ammeter is connected as shown. What is the current reading of the ammeter?current reading of the ammeter?(A) 1.0 A (A) 1.0 A (B) 0.40 A(B) 0.40 A(C) 0.60 A (C) 0.60 A (D) 0.20 A(D) 0.20 A

A 20-ohm resistor and a A 20-ohm resistor and a 30-ohm resistor are connected 30-ohm resistor are connected in parallel to a 12-volt battery as shown. An in parallel to a 12-volt battery as shown. An ammeter is connected as shown. What is the ammeter is connected as shown. What is the power of the 30.-ohm resistor?power of the 30.-ohm resistor?(A) 4.8 W (A) 4.8 W (B) 12 W(B) 12 W(C) 30 W(C) 30 W(D) 75 W(D) 75 W

A physics student notices that 4.0 waves arrive at the beach every 20 seconds. The frequency of these waves is(A) 0.20 Hz(B) 16 Hz (C) 5.0 Hz(D) 80 Hz

An electric guitar is generating a sound of constant frequency. An increase in which sound wave characteristic would result in an increase in loudness?(A) speed (B) period(C) wavelength (D) amplitude

How many wavelengths separate point A and point B?

(A) 1.0(B) 3.0 (C) 1.5(D) 0.75

Which diagram best represents magnetic field lines around a bar magnet?

The spaceship is moving away from Earth when the radio signal is received. Compared to the frequency of the signal sent from Earth, the frequency of the signal received by the spaceship is

(A) lower (B) higher (C) the same

What is the total electrical energy used by a 1500-watt hair dryer operating for 6.0 minutes?

(A) 4.2 J (B) 250 J(C) 9.0×103 J (D) 5.4×105 J

A periodic transverse wave has an amplitude of 0.20 meter and a wavelength of 3.0 meters. If the frequency of this wave is 12 Hz, what is its speed?(A) 0.25 m/s (C) 36 m/s (B) 12 m/s (D) 4.0 m/s

An electric iron operating at 120 volts An electric iron operating at 120 volts draws 10 amperes of current. How much draws 10 amperes of current. How much heat energy is delivered by the iron in 30 heat energy is delivered by the iron in 30 seconds?seconds?(A) 3.0 × 10(A) 3.0 × 1022 J J(B) 1.2 × 10(B) 1.2 × 1033 J J (C) 3.6 × 10(C) 3.6 × 1033 J J(D) 3.6 × 10(D) 3.6 × 1044 J J

A motor is used to produce 4.0 waves A motor is used to produce 4.0 waves each second in a string. What is the each second in a string. What is the frequency of the waves?frequency of the waves?

(A) 0.25 Hz (A) 0.25 Hz (B) 25 Hz(B) 25 Hz(C) 15 Hz (C) 15 Hz (D) 4.0 Hz(D) 4.0 Hz

A surfacing whale in an aquarium A surfacing whale in an aquarium produces water wave crests having an produces water wave crests having an amplitude of 1.2 meters every 0.40 amplitude of 1.2 meters every 0.40 second. If the water wave travels at 4.5 second. If the water wave travels at 4.5 meters per second, the wavelength of the meters per second, the wavelength of the wave iswave is

(A) 1.8 m (B) 2.4 m (C) 3.0 m (D) 11 m(A) 1.8 m (B) 2.4 m (C) 3.0 m (D) 11 m

A radar gun can determine the speed of a A radar gun can determine the speed of a moving automobile by measuring the moving automobile by measuring the difference in frequency between emitted difference in frequency between emitted and reflected radar waves. This process and reflected radar waves. This process illustratesillustrates

(A) resonance (A) resonance (B) diffraction(B) diffraction(C) the Doppler effect (C) the Doppler effect (D) refraction(D) refraction

A laser beam is A laser beam is directed at the directed at the surface of a surface of a smooth, calm smooth, calm pond. Which pond. Which organisms could organisms could be illuminated by the laser light?be illuminated by the laser light?

(A) the bird and the fish (A) the bird and the fish (B) the crab and the seaweed(B) the crab and the seaweed(C) the bird and the seaweed (C) the bird and the seaweed (D) the crab and the fish(D) the crab and the fish

A photon of which electromagnetic A photon of which electromagnetic radiation has the most energy?radiation has the most energy?

(A) ultraviolet (A) ultraviolet (C) infrared(C) infrared(B) x ray (B) x ray (D) microwave(D) microwave

What is the reading on ammeter A?What is the reading on ammeter A?(A) 1.3 A (A) 1.3 A (C) 3.0 A(C) 3.0 A(B) 1.5 A (B) 1.5 A (D) 0.75 A(D) 0.75 A

Two pulses are traveling toward each other in a Two pulses are traveling toward each other in a uniform medium. Which diagram best represents uniform medium. Which diagram best represents the medium when the pulses meet at point X?the medium when the pulses meet at point X?

(A)(A)

(B)(B)

(C)(C)

(D)(D)

A mass, M, is hung from A mass, M, is hung from a spring and reaches a spring and reaches equilibrium at position B. equilibrium at position B. The mass is then raised to The mass is then raised to position A and released. position A and released. The mass oscillates between The mass oscillates between positions A and C. positions A and C.

At which position, A, B, or C, At which position, A, B, or C, is mass M located when the is mass M located when the kinetic energy of the system kinetic energy of the system is at a maximum? is at a maximum?

A mass, M, is hung from A mass, M, is hung from a spring and reaches a spring and reaches equilibrium at position B. equilibrium at position B. The mass is then raised to The mass is then raised to position A and released. position A and released. The mass oscillates between The mass oscillates between positions A and C. positions A and C.

At which position, A, B, or C, At which position, A, B, or C, is mass M located when the is mass M located when the gravitational potential energy gravitational potential energy of the system is at a maximum? of the system is at a maximum?

A mass, M, is hung from A mass, M, is hung from a spring and reaches a spring and reaches equilibrium at position B. equilibrium at position B. The mass is then raised to The mass is then raised to position A and released. position A and released. The mass oscillates between The mass oscillates between positions A and C. positions A and C.

At which position, A, B, or C, At which position, A, B, or C, is mass M located when the is mass M located when the elastic potential energy of the elastic potential energy of the system is at a maximum?system is at a maximum?