Question 1

In order to keep its food hot, a restaurant will place it under which type of lamp?

Accepted Answer

A) infrared 
B) visible light 
C) ultraviolet 
D) x-ray 
A) infrared 
B) visible light 
C) ultraviolet 
D) x-ray

Question 2

An ultraviolet light wave has a wavelength of 300 nm and speed of 2.1 * 108 m/s through a transparent medium.What is the frequency of this wave in the medium? (1 nm = 10-9 m and c = 3.00 * 108 m/s)

Accepted Answer

A) 6.3 * 102 Hz 
B) 9.0 * 102 Hz 
C) 7.0 * 1014 Hz 
D) 10 * 1014 Hz 
A) 6.3 * 102 Hz 
B) 9.0 * 102 Hz 
C) 7.0 * 1014 Hz 
D) 10 * 1014 Hz

Question 3

An electromagnetic wave with a peak magnetic field component of 1.5 * 10-7 T has an associated peak electric field component of what value? (m0 = 4p * 10-7 T*m/A, e0 = 8.85 * 10-12 C2/N*m2 and c = 3.00 * 108 m/s)

Accepted Answer

A) 0.50 * 10-15 N/C 
B) 2.00 * 10-5 N/C 
C) 2.20 * 104 N/C 
D) 45 N/C 
A) 0.50 * 10-15 N/C 
B) 2.00 * 10-5 N/C 
C) 2.20 * 104 N/C 
D) 45 N/C

Question 4

An AC series circuit has 12.0 W resistance, 15.00 W inductive reactance and 10.00 W capacitive reactance.If an effective (rms) emf of 120 V is applied, what is the power output?

Accepted Answer

A) 1 540 W 
B) 1 300 W 
C) 1 160 W 
D) 1 020 W 
A) 1 540 W 
B) 1 300 W 
C) 1 160 W 
D) 1 020 W

Question 5

What is the average power dissipation in an RLC series circuit in which R = 100 W, L = 0.1 H, and C = 10 µF driven at resonance by a 100-V (rms) source?

Accepted Answer

A) 100 W 
B) 500 W 
C) 1 000 W 
D) 2 W 
A) 100 W 
B) 500 W 
C) 1 000 W 
D) 2 W

Question 6

The rate of heat dissipation in an AC circuit with resistance, R, and effective current, Irms, is given by which of the following?

Accepted Answer

A) 0.5 * (Irms)2R 
B) (Irms)2R 
C) 2.0 * (Irms)2R 
D) 4.0 * (Irms)2R 
A) 0.5 * (Irms)2R 
B) (Irms)2R 
C) 2.0 * (Irms)2R 
D) 4.0 * (Irms)2R

Question 7

A transformer consists of a 500-turn primary coil and a 2 000-turn secondary coil.If the current in the secondary is 3.00 A, what is the primary current?

Accepted Answer

A) 0.750 A 
B) 1.33 A 
C) 12.0 A 
D) 48.0 A 
A) 0.750 A 
B) 1.33 A 
C) 12.0 A 
D) 48.0 A

Question 8

A radar pulse sent out to an airplane at a distance of 20.0 km will return as an echo to the source in what time interval? (c = 3.00 * 108 m/s)

Accepted Answer

A) 33.3 * 10-6 s 
B) 66.7 * 10-6 s 
C) 133 * 10-6 s 
D) 0.033 3 * 10-6 s 
A) 33.3 * 10-6 s 
B) 66.7 * 10-6 s 
C) 133 * 10-6 s 
D) 0.033 3 * 10-6 s

Question 9

The human eye is sensitive to light with wavelength down to 390 nm.What is the frequency of radiation at this wavelength? (1 nm = 10-9 m and c = 3.00 * 108 m/s)

Accepted Answer

A) 1.8 * 108 Hz 
B) 8.5 * 108 Hz 
C) 1.1 * 1011 Hz 
D) 7.7 * 1014 Hz 
A) 1.8 * 108 Hz 
B) 8.5 * 108 Hz 
C) 1.1 * 1011 Hz 
D) 7.7 * 1014 Hz

Question 10

An AC voltage source, with a peak output of 200 V, is connected to a 50-W resistor.What is the effective (or rms) current in the circuit?

Accepted Answer

A) 2.8 A 
B) 4.0 A 
C) 5.6 A 
D) 2.0 A 
A) 2.8 A 
B) 4.0 A 
C) 5.6 A 
D) 2.0 A

Question 11

Find the frequency of x-rays of wavelength 10-10 m.(c = 3 * 108 m/s)

Accepted Answer

A) 3 * 1018 Hz 
B) 3 * 1016 Hz 
C) 6 * 109 Hz 
D) 3 * 108 Hz 
A) 3 * 1018 Hz 
B) 3 * 1016 Hz 
C) 6 * 109 Hz 
D) 3 * 108 Hz

Question 12

In an AC series circuit the capacitive reactance is 200 W and frequency is 100 Hz.What is the capacitance?

Accepted Answer

A) 3.2 mF 
B) 6.28 mF 
C) 8.0 mF 
D) 50.0 mF 
A) 3.2 mF 
B) 6.28 mF 
C) 8.0 mF 
D) 50.0 mF

Question 13

An FM radio tuning circuit has a coil with an inductance of 0.003 0 mH.What is the value of the capacitance if the set is tuned to 98 MHz?

Accepted Answer

A) 1.8 * 10-6 mF 
B) 12 * 10-6 mF 
C) 0.98 * 10-6 mF 
D) 0.88 * 10-6 mF 
A) 1.8 * 10-6 mF 
B) 12 * 10-6 mF 
C) 0.98 * 10-6 mF 
D) 0.88 * 10-6 mF

Question 14

In an AC series circuit, the voltage in the inductor differs in phase with the voltage in the capacitor by what angle?

Accepted Answer

A) zero 
B) 45$\degree$ 
C) 90$\degree$ 
D) 180$\degree$ 
A) zero 
B) 45$\degree$ 
C) 90$\degree$ 
D) 180$\degree$

Question 15

In an AC series circuit, the current in a pure resistor differs in phase with the applied voltage by what angle?

Accepted Answer

A) zero 
B) 45$\degree$ 
C) 90$\degree$ 
D) 180$\degree$ 
A) zero 
B) 45$\degree$ 
C) 90$\degree$ 
D) 180$\degree$

Question 16

What value of inductance should be used in a series circuit with a capacitor of 1.8 * 10-3 mF when designed to radiate a wavelength of 35 m? (c = 3.00 * 108 m/s)

Accepted Answer

A) 3.8 mH 
B) 2.6 * 10-2 mH 
C) 3.8 * 10-3 mH 
D) 1.9 * 10-4 mH 
A) 3.8 mH 
B) 2.6 * 10-2 mH 
C) 3.8 * 10-3 mH 
D) 1.9 * 10-4 mH

Question 17

In a 60-Hz RLC circuit, the phase angle is positive.The values of the resistance, inductance, and the capacitance are now doubled.Which of the following is now true about the phase angle?

Accepted Answer

A) It is still positive. 
B) It could be zero. 
C) It will be negative. 
D) It could be positive, negative, or zero, but it cannot be greater than its original value. 
A) It is still positive. 
B) It could be zero. 
C) It will be negative. 
D) It could be positive, negative, or zero, but it cannot be greater than its original value.

Question 18

An AC series circuit contains a resistor of 20 W, a capacitor of 0.75 mF and an inductor of 120 mH.What frequency should be used to create a resonance condition in the circuit?

Accepted Answer

A) 160 Hz 
B) 320 Hz 
C) 640 Hz 
D) 530 Hz 
A) 160 Hz 
B) 320 Hz 
C) 640 Hz 
D) 530 Hz

Question 19

A resistor, inductor, and capacitor are connected in series, each with effective (rms) voltage of 65 V, 140 V, and 80 V, respectively.What is the value of the effective (rms) voltage of the applied source in the circuit?

Accepted Answer

A) 48 V 
B) 88 V 
C) 95 V 
D) 285 V 
A) 48 V 
B) 88 V 
C) 95 V 
D) 285 V

Question 20

Which one of the following scientists made the theoretical prediction that electromagnetic waves travel through a vacuum at the speed of light?

Accepted Answer

A) Hertz 
B) Faraday 
C) Maxwell 
D) Lenz 
A) Hertz 
B) Faraday 
C) Maxwell 
D) Lenz

Exam 21: Alternating Current Circuits and Electromagnetic Waves

In order to keep its food hot, a restaurant will place it under which type of lamp?

An ultraviolet light wave has a wavelength of 300 nm and speed of 2.1 * 108 m/s through a transparent medium.What is the frequency of this wave in the medium? (1 nm = 10-9 m and c = 3.00 * 108 m/s)

An electromagnetic wave with a peak magnetic field component of 1.5 * 10-7 T has an associated peak electric field component of what value? (m0 = 4p * 10-7 T*m/A, e0 = 8.85 * 10-12 C2/N*m2 and c = 3.00 * 108 m/s)

An AC series circuit has 12.0 W resistance, 15.00 W inductive reactance and 10.00 W capacitive reactance.If an effective (rms) emf of 120 V is applied, what is the power output?

What is the average power dissipation in an RLC series circuit in which R = 100 W, L = 0.1 H, and C = 10 µF driven at resonance by a 100-V (rms) source?

The rate of heat dissipation in an AC circuit with resistance, R, and effective current, Irms, is given by which of the following?

A transformer consists of a 500-turn primary coil and a 2 000-turn secondary coil.If the current in the secondary is 3.00 A, what is the primary current?

A radar pulse sent out to an airplane at a distance of 20.0 km will return as an echo to the source in what time interval? (c = 3.00 * 108 m/s)

The human eye is sensitive to light with wavelength down to 390 nm.What is the frequency of radiation at this wavelength? (1 nm = 10-9 m and c = 3.00 * 108 m/s)

An AC voltage source, with a peak output of 200 V, is connected to a 50-W resistor.What is the effective (or rms) current in the circuit?

Find the frequency of x-rays of wavelength 10-10 m.(c = 3 * 108 m/s)

In an AC series circuit the capacitive reactance is 200 W and frequency is 100 Hz.What is the capacitance?

An FM radio tuning circuit has a coil with an inductance of 0.003 0 mH.What is the value of the capacitance if the set is tuned to 98 MHz?

In an AC series circuit, the voltage in the inductor differs in phase with the voltage in the capacitor by what angle?

In an AC series circuit, the current in a pure resistor differs in phase with the applied voltage by what angle?

What value of inductance should be used in a series circuit with a capacitor of 1.8 * 10-3 mF when designed to radiate a wavelength of 35 m? (c = 3.00 * 108 m/s)

In a 60-Hz RLC circuit, the phase angle is positive.The values of the resistance, inductance, and the capacitance are now doubled.Which of the following is now true about the phase angle?

An AC series circuit contains a resistor of 20 W, a capacitor of 0.75 mF and an inductor of 120 mH.What frequency should be used to create a resonance condition in the circuit?

A resistor, inductor, and capacitor are connected in series, each with effective (rms) voltage of 65 V, 140 V, and 80 V, respectively.What is the value of the effective (rms) voltage of the applied source in the circuit?

Which one of the following scientists made the theoretical prediction that electromagnetic waves travel through a vacuum at the speed of light?

Introduction

Motion in One Dimension

Vectors and Two-Dimensional Motion

The Laws of Motion

Energy

Momentum and Collisions

Rotational Motion and the Law of Gravity

Rotational Equilibrium and Rotational Dynamics

Solids and Fluids

Thermal Physics

Energy in Thermal Processes

The Laws of Thermodynamics

Vibrations and Waves

Sound

Electric Forces and Electric Fields

Electrical Energy and Capacitance

Current and Resistance

Direct-Current Circuits

Magnetism

Induced Voltages and Inductance

Reflection and Refraction of Light

Mirrors and Lenses

Wave Optics

Optical Instruments

Relativity

Quantum Physics

Atomic Physics

Nuclear Physics

Nuclear Energy and Elementary Particles

Filters

An ultraviolet light wave has a wavelength of 300 nm and speed of 2.1 * 10⁸m/s through a transparent medium.What is the frequency of this wave in the medium? (1 nm = 10^-9 m and c = 3.00 * 10⁸ m/s)

An electromagnetic wave with a peak magnetic field component of 1.5 * 10^-7 T has an associated peak electric field component of what value? (m₀ = 4p * 10^-7 Tm/A, e₀ = 8.85 10^-12 C²/Nm² and c = 3.00 10⁸ m/s)

The rate of heat dissipation in an AC circuit with resistance, R, and effective current, I_rms, is given by which of the following?

A radar pulse sent out to an airplane at a distance of 20.0 km will return as an echo to the source in what time interval? (c = 3.00 * 10⁸ m/s)

The human eye is sensitive to light with wavelength down to 390 nm.What is the frequency of radiation at this wavelength? (1 nm = 10^-9 m and c = 3.00 * 10⁸ m/s)

Find the frequency of x-rays of wavelength 10^-10m.(c = 3 * 10⁸ m/s)

What value of inductance should be used in a series circuit with a capacitor of 1.8 * 10^-3 mF when designed to radiate a wavelength of 35 m? (c = 3.00 * 10⁸ m/s)