Question 1

Electromagnetic waves: In an electromagnetic wave, the electric and magnetic fields are oriented such that they are

Accepted Answer

A)  parallel to one another and perpendicular to the direction of wave propagation. 
B)  parallel to one another and parallel to the direction of wave propagation. 
C)  perpendicular to one another and perpendicular to the direction of wave propagation. 
D)  perpendicular to one another and parallel to the direction of wave propagation. 
A)  parallel to one another and perpendicular to the direction of wave propagation. 
B)  parallel to one another and parallel to the direction of wave propagation. 
C)  perpendicular to one another and perpendicular to the direction of wave propagation. 
D)  perpendicular to one another and parallel to the direction of wave propagation.

Question 2

Radiation pressure: A radiometer has two square vanes (1.0 cm by 1.0 cm), attached to a light horizontal cross arm, and pivoted about a vertical axis through the center, as shown in the figure. The center of each vane is 6.0 cm from the axis. One vane is silvered and it reflects all radiant energy incident upon it. The other vane is blackened and it absorbs all incident radiant energy. An electromagnetic wave with an intensity of 0.30 kW/m2 is incident normally upon the vanes. What is the radiation pressure on the blackened vane? (c = 3.00 × 108 m/s, μ0 = 4π × 10-7 T ∙ m/A, ε0 = 8.85 × 10-12 C2/N ∙ m2)

Accepted Answer

A)  1.0 × 10-10 Pa 
B)  1.0 × 10-9 Pa 
C)  1.0 × 10-8 Pa 
D)  1.0 × 10-7 Pa 
E)  1.0 × 10-6 Pa 
A)  1.0 × 10-10 Pa 
B)  1.0 × 10-9 Pa 
C)  1.0 × 10-8 Pa 
D)  1.0 × 10-7 Pa 
E)  1.0 × 10-6 Pa

Question 3

Field intensity: A 7.5 × 1014 Hz laser emits a 7.7-μs pulse, 5.0 mm in diameter, with a beam energy density of 0.51 J/m3. What is the amplitude of the electric field of the emitted waves? (c = 3.00 × 108 m/s, μ0 = 4π × 10-7 T ∙ m/A, ε0 = 8.85 × 10-12 C2/N ∙ m2)

Accepted Answer

A)  340 kV/m 
B)  480 kV/m 
C)  240 kV/m 
D)  150 kV/m 
E)  120 kV/m 
A)  340 kV/m 
B)  480 kV/m 
C)  240 kV/m 
D)  150 kV/m 
E)  120 kV/m

Question 4

Field intensity: A microwave oven operates with sinusoidal microwaves at a frequency of 2400 MHz. The height of the oven cavity is 25 cm and the base measures 30 cm by 30 cm. Assume that microwave energy is generated uniformly on the upper surface of the cavity and propagates directly downward toward the base. The base is lined with a material that completely absorbs microwave energy. The total microwave energy content of the cavity is 0.50 µJ. What is the power output of the oven? (c = 3.00 × 108 m/s, μ0 = 4π × 10-7 T ∙ m/A, ε0 = 8.85 × 10-12 C2/N ∙ m2)

Accepted Answer

A)  0.50 kW 
B)  0.55 kW 
C)  0.60 kW 
D)  0.65 kW 
E)  0.70 kW 
A)  0.50 kW 
B)  0.55 kW 
C)  0.60 kW 
D)  0.65 kW 
E)  0.70 kW

Question 5

Electromagnetic waves: The y-component of the electric field of an electromagnetic wave traveling in the +x direction through vacuum obeys the equation Ey = (375 N/C) cos[kx - (2.20 × 1014 rad/s)t]. (c = 3.0 × 108 m/s)
(a) What is the largest that the x-component of the wave can be?
(b) What is the largest that the z-component of the wave can be?

Accepted Answer

(a) zero

Question 6

Radiation pressure: The average intensity of the sunlight in Miami, Florida, is 1.04 kW/m2. For surfaces on which the light is all absorbed, what is the average value of the radiation pressure due to this sunlight in Miami? (c = 3.00 × 108 m/s, μ0 = 4π × 10-7 T ∙· m/A, ε0 = 8.85 × 10-12 C2/N ∙ m2)

Accepted Answer

Question 7

Field intensity: If a beam of electromagnetic radiation has an intensity of 120 W/m2, what is the maximum value of the electric field? (c = 3.0 × 108 m/s, μ0 = 4π × 10-7 T ∙ m/A, ε0 = 8.85 × 10-12 C2/N ∙ m2)

Accepted Answer

A)  1.5 kV/m 
B)  1.0 µT 
C)  1.0 µV/m 
D)  0.30 kV/m 
E)  0.0032 V/m 
A)  1.5 kV/m 
B)  1.0 µT 
C)  1.0 µV/m 
D)  0.30 kV/m 
E)  0.0032 V/m

Question 8

Electromagnetic waves: If the z-component of the magnetic field of an electromagnetic wave traveling in the +x direction through vacuum obeys the equation Bz(x, t) = (1.25 μT) cos[(3800 m-1)x - (1.14 × 10-12 rad/s)t], what is the largest that the y component of the electric field can be? (c = 3.0 × 108 m/s)

Accepted Answer

A)  375 N/C 
B)  4.17 × 10-15 N/C 
C)  3.75 × 108 N/C 
D)  4.17 × 10-9 N/C 
E)  1.25 × 106 N/C 
A)  375 N/C 
B)  4.17 × 10-15 N/C 
C)  3.75 × 108 N/C 
D)  4.17 × 10-9 N/C 
E)  1.25 × 106 N/C

Question 9

Field intensity: An 800-kHz radio signal is detected at a point 4.5 km distant from a transmitter tower. The electric field amplitude of the signal at that point is 0.63 V/m. Assume that the signal power is radiated uniformly in all directions and that radio waves incident upon the ground are completely absorbed. What is the magnetic field amplitude of the signal at that point? (c = 3.0 × 108 m/s, μ0 = 4π × 10-7 T ∙ m/A, ε0 = 8.85 × 10-12 C2/N ∙ m2)

Accepted Answer

A)  2.1 nT 
B)  1.7 nT 
C)  1.3 nT 
D)  2.5 nT 
E)  2.9 nT 
A)  2.1 nT 
B)  1.7 nT 
C)  1.3 nT 
D)  2.5 nT 
E)  2.9 nT

Question 10

Field intensity: An electromagnetic wave has a peak electric field of 3.0 kV/m. What is the intensity of the wave? (c = 3.0 × 108 m/s, μ0 = 4π × 10-7 T ∙ m/A, ε0 = 8.85 × 10-12 C2/N ∙ m2)

Accepted Answer

A)  24 kW/m2 
B)  12 kW/m2 
C)  8.0 kW/m2 
D)  4.0 kW/m2 
A)  24 kW/m2 
B)  12 kW/m2 
C)  8.0 kW/m2 
D)  4.0 kW/m2

Question 11

Electromagnetic waves: Which one of the following lists is a correct representation of electromagnetic waves from longer wavelength to shorter wavelength?

Accepted Answer

A)  radio waves, infrared, microwaves, UV, visible, X-rays, gamma rays 
B)  radio waves, UV, X-rays, microwaves, infrared, visible, gamma rays 
C)  radio waves, microwaves, visible, X-rays, infrared, UV, gamma rays 
D)  radio waves, microwaves, infrared, visible, UV, X-rays, gamma rays 
E)  radio waves, infrared, X-rays, microwaves, UV, visible, gamma rays 
A)  radio waves, infrared, microwaves, UV, visible, X-rays, gamma rays 
B)  radio waves, UV, X-rays, microwaves, infrared, visible, gamma rays 
C)  radio waves, microwaves, visible, X-rays, infrared, UV, gamma rays 
D)  radio waves, microwaves, infrared, visible, UV, X-rays, gamma rays 
E)  radio waves, infrared, X-rays, microwaves, UV, visible, gamma rays

Electromagnetic waves: In an electromagnetic wave, the electric and magnetic fields are oriented such that they are

Field intensity: A 7.5 × 10¹⁴ Hz laser emits a 7.7-μs pulse, 5.0 mm in diameter, with a beam energy density of 0.51 J/m³. What is the amplitude of the electric field of the emitted waves? (c = 3.00 × 10⁸ m/s, μ₀ = 4π × 10^-7 T ∙ m/A, ε₀ = 8.85 × 10^-12 C²/N ∙ m²)

Field intensity: If a beam of electromagnetic radiation has an intensity of 120 W/m², what is the maximum value of the electric field? (c = 3.0 × 10⁸ m/s, μ₀ = 4π × 10^-7 T ∙ m/A, ε₀ = 8.85 × 10^-12 C²/N ∙ m²)

Field intensity: An electromagnetic wave has a peak electric field of 3.0 kV/m. What is the intensity of the wave? (c = 3.0 × 10⁸ m/s, μ₀ = 4π × 10^-7 T ∙ m/A, ε₀ = 8.85 × 10^-12 C²/N ∙ m²)

Electromagnetic waves: Which one of the following lists is a correct representation of electromagnetic waves from longer wavelength to shorter wavelength?

Motion Along a Straight Line

Motion in Two or Three Dimensions

Newtons Laws of Motion

Applying Newtons Laws

Work and Kinetic Energy

Potential Energy and Energy Conservation

Momentum, Impulse, and Collisions

Rotation of Rigid Bodies

Dynamics of Rotational Motion

Equilibrium and Elasticity

Fluid Mechanics

Gravitation

Periodic Motion

Mechanical Waves

Sound and Hearing

Temperature and Heat

Thermal Properties of Matter

The First Law of Thermodynamics

The Second Law of Thermodynamics

Electric Charge and Electric Field

Gausss Law

Electric Potential

Capacitance and Dielectrics

Current, Resistance, and Electromotive Force

Magnetic Field and Magnetic Forces

Sources of Magnetic Field

Electromagnetic Induction

Inductance

Alternating Current

Electromagnetic Waves Optics

The Nature and Propagation of Light

Geometric Optics

Interference

Filters

Exam 26: Direct-Current Circuits

Electromagnetic waves: In an electromagnetic wave, the electric and magnetic fields are oriented such that they are

Field intensity: A 7.5 × 1014 Hz laser emits a 7.7-μs pulse, 5.0 mm in diameter, with a beam energy density of 0.51 J/m3. What is the amplitude of the electric field of the emitted waves? (c = 3.00 × 108 m/s, μ0 = 4π × 10-7 T ∙ m/A, ε0 = 8.85 × 10-12 C2/N ∙ m2)

Field intensity: If a beam of electromagnetic radiation has an intensity of 120 W/m2, what is the maximum value of the electric field? (c = 3.0 × 108 m/s, μ0 = 4π × 10-7 T ∙ m/A, ε0 = 8.85 × 10-12 C2/N ∙ m2)

Field intensity: An electromagnetic wave has a peak electric field of 3.0 kV/m. What is the intensity of the wave? (c = 3.0 × 108 m/s, μ0 = 4π × 10-7 T ∙ m/A, ε0 = 8.85 × 10-12 C2/N ∙ m2)

Electromagnetic waves: Which one of the following lists is a correct representation of electromagnetic waves from longer wavelength to shorter wavelength?

Motion Along a Straight Line

Motion in Two or Three Dimensions

Newtons Laws of Motion

Applying Newtons Laws

Work and Kinetic Energy

Potential Energy and Energy Conservation

Momentum, Impulse, and Collisions

Rotation of Rigid Bodies

Dynamics of Rotational Motion

Equilibrium and Elasticity

Fluid Mechanics

Gravitation

Periodic Motion

Mechanical Waves

Sound and Hearing

Temperature and Heat

Thermal Properties of Matter

The First Law of Thermodynamics

The Second Law of Thermodynamics

Electric Charge and Electric Field

Gausss Law

Electric Potential

Capacitance and Dielectrics

Current, Resistance, and Electromotive Force

Magnetic Field and Magnetic Forces

Sources of Magnetic Field

Electromagnetic Induction

Inductance

Alternating Current

Electromagnetic Waves Optics

The Nature and Propagation of Light

Geometric Optics

Interference

Filters

Field intensity: A 7.5 × 10¹⁴ Hz laser emits a 7.7-μs pulse, 5.0 mm in diameter, with a beam energy density of 0.51 J/m³. What is the amplitude of the electric field of the emitted waves? (c = 3.00 × 10⁸ m/s, μ₀ = 4π × 10^-7 T ∙ m/A, ε₀ = 8.85 × 10^-12 C²/N ∙ m²)

Field intensity: If a beam of electromagnetic radiation has an intensity of 120 W/m², what is the maximum value of the electric field? (c = 3.0 × 10⁸ m/s, μ₀ = 4π × 10^-7 T ∙ m/A, ε₀ = 8.85 × 10^-12 C²/N ∙ m²)

Field intensity: An electromagnetic wave has a peak electric field of 3.0 kV/m. What is the intensity of the wave? (c = 3.0 × 10⁸ m/s, μ₀ = 4π × 10^-7 T ∙ m/A, ε₀ = 8.85 × 10^-12 C²/N ∙ m²)