Question 1

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

Question 2

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 3

If the intensity of an electromagnetic wave is 80 MW/m2,what is the amplitude of the magnetic field of this wave? (c = 3.0 × 108 m/s,μ0 = 4π × 10-7 T • m/A,

Accepted Answer

A)  0.82 mT 
B)  0.33 µT 
C)  10 T 
D)  14 T 
E)  0.58 mT 
A)  0.82 mT 
B)  0.33 µT 
C)  10 T 
D)  14 T 
E)  0.58 mT

Question 4

A planar electromagnetic wave is propagating in the +x direction.At a certain point P and at a given instant,the electric field of the wave is given by   = (0.082 V/m)   .What is the magnetic vector of the wave at the point P at that instant? (c = 3.0 × 108 m/s)

Accepted Answer

A)  0.27 nT   
B)  -0.27 nT   
C)  0.27 nT   
D)  6.8 nT   
E)  -6.8 nT   
A)  0.27 nT   
B)  -0.27 nT   
C)  0.27 nT   
D)  6.8 nT   
E)  -6.8 nT

Question 5

A totally absorbing surface having an area of 7.7 cm2 faces a small source of sinusoidal electromagnetic radiation that is 2.4 m away.At the surface,the electric field amplitude of the radiation is 84 V/m.   μ0 = 4π × 10-7 T • m/A,   (a)What is the radiation pressure exerted on the surface?
(b)What is the total power output of the source,if it is assumed to radiate uniformly in all directions?

Accepted Answer

(a)0.031 µ

Question 6

Near the earth the intensity of radiation from the sun is 1.35 kW/m2.What volume of space in this region contains 1.0 J of electromagnetic energy? (c = 3.0 × 108 m/s,   ,

Accepted Answer

A)  4.5 × 10-6 m3 
B)  3300 m3 
C)  7.4 × 10-4 m3 
D)  1400 m3 
E)  220,000 m3 
A)  4.5 × 10-6 m3 
B)  3300 m3 
C)  7.4 × 10-4 m3 
D)  1400 m3 
E)  220,000 m3

Question 7

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 torque due to radiation pressure on the vane assembly about the vertical axis?   ,   ,

Accepted Answer

A)  2.4 × 10-12 N • m 
B)  6.0 × 10-12 N • m 
C)  1.2 × 10-11 N • m 
D)  1.8 × 10-11 N • m 
E)  2.4 × 10-11 N • m 
A)  2.4 × 10-12 N • m 
B)  6.0 × 10-12 N • m 
C)  1.2 × 10-11 N • m 
D)  1.8 × 10-11 N • m 
E)  2.4 × 10-11 N • m

Question 8

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?   ,   ,

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 9

The total electromagnetic power emitted by the sun is 3.8 × 1026 W.What is the radiation pressure on a totally absorbing satellite at the orbit of Mercury,which has an orbital radius of 5.8 × 1010 m?   ,μ0 = 4π × 10-7 T • m/A,

Accepted Answer

A)  30 µPa 
B)  0.30 µPa 
C)  0.030 µPa 
D)  300 µPa 
E)  3.0 µPa 
A)  30 µPa 
B)  0.30 µPa 
C)  0.030 µPa 
D)  300 µPa 
E)  3.0 µPa

Question 10

The energy per unit volume in an electromagnetic wave is

Accepted Answer

A)  equally divided between the electric and magnetic fields. 
B)  mostly in the electric field. 
C)  mostly in the magnetic field. 
D)  all in the electric field. 
E)  all in the magnetic field. 
A)  equally divided between the electric and magnetic fields. 
B)  mostly in the electric field. 
C)  mostly in the magnetic field. 
D)  all in the electric field. 
E)  all in the magnetic field.

Question 11

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].   (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

Question 12

When an electromagnetic wave falls on a white,perfectly reflecting surface,it exerts a force F on that surface.If the surface is now painted a perfectly absorbing black,what will be the force that the same wave will exert on the surface?

Accepted Answer

A)  4F 
B)  2F 
C)  F 
D)  F/2 
E)  F/4 
A)  4F 
B)  2F 
C)  F 
D)  F/2 
E)  F/4

Question 13

If the magnetic field of an electromagnetic wave is in the +x-direction and the electric field of the wave is in the +y-direction,the wave is traveling in the

Accepted Answer

A)  xy-plane. 
B)  +z-direction. 
C)  -z-direction. 
D)  -x-direction. 
E)  -y-direction. 
A)  xy-plane. 
B)  +z-direction. 
C)  -z-direction. 
D)  -x-direction. 
E)  -y-direction.

Question 14

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,

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 15

An 800-kHz radio signal is detected at a point 9.1 km distant from a transmitter tower.The electric field amplitude of the signal at that point is 0.440 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 average total power radiated by the transmitter?   , μ0 = 4π × 10-7 T • m/A,

Accepted Answer

A)  0.27 MW 
B)  0.32 MW 
C)  0.38 MW 
D)  0.45 MW 
E)  0.50 MW 
A)  0.27 MW 
B)  0.32 MW 
C)  0.38 MW 
D)  0.45 MW 
E)  0.50 MW

Question 16

A laser beam has a wavelength of 633 nm and a power of 0.500 mW spread uniformly over a circle 1.20 mm in diameter.This beam falls perpendicularly on a perfectly reflecting piece of paper having twice the diameter of the laser beam and a mass of 1.50 mg.(c = 3.00 × 108 m/s,μ0 = 4π × 10-7 T • m/A,   (a)What are the amplitudes of the electric and magnetic fields in this laser beam?
(b)What acceleration does the laser beam give to the paper?

Accepted Answer

(a)577 N/C

Question 17

An electromagnetic wave is propagating towards the west.At a certain moment the direction of the magnetic field vector associated with this wave points vertically up.The direction of the electric field vector of this wave is

Accepted Answer

A)  horizontal and pointing south. 
B)  vertical and pointing down. 
C)  horizontal and pointing north. 
D)  vertical and pointing up. 
E)  horizontal and pointing east. 
A)  horizontal and pointing south. 
B)  vertical and pointing down. 
C)  horizontal and pointing north. 
D)  vertical and pointing up. 
E)  horizontal and pointing east.

Question 18

A very small source of light that radiates uniformly in all directions produces an electric field amplitude of 2.96 V/m at a point 33.0 m from the source.What is the power output from the source?   μ0 = 4π × 10-7 T • m/A,ε0 = 8.85 × 10-12 C2/N • m2)

Accepted Answer

Question 19

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 amplitude of the electric field? (c = 3.00 × 108 m/s,   ,

Accepted Answer

A)  1600 V/m 
B)  1900 V/m 
C)  2200 V/m 
D)  2500 V/m 
E)  2800 V/m 
A)  1600 V/m 
B)  1900 V/m 
C)  2200 V/m 
D)  2500 V/m 
E)  2800 V/m

Question 20

An 800-kHz radio signal is detected at a point 2.7 km distant from a transmitter tower.The electric field amplitude of the signal at that point is 0.36 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 intensity of the radio signal at that point?   , μ0 = 4π × 10-7 T • m/A,

Accepted Answer

A)  170 µW/m2 
B)  240 µW/m2 
C)  340 µW/m2 
D)  120 µW/m2 
E)  86 µW/m2 
A)  170 µW/m2 
B)  240 µW/m2 
C)  340 µW/m2 
D)  120 µW/m2 
E)  86 µW/m2

Exam 32: Electromagnetic Waves

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

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

If the intensity of an electromagnetic wave is 80 MW/m2,what is the amplitude of the magnetic field of this wave? (c = 3.0 × 108 m/s,μ0 = 4π × 10-7 T • m/A,

A planar electromagnetic wave is propagating in the +x direction.At a certain point P and at a given instant,the electric field of the wave is given by = (0.082 V/m) .What is the magnetic vector of the wave at the point P at that instant? (c = 3.0 × 108 m/s)

Near the earth the intensity of radiation from the sun is 1.35 kW/m2.What volume of space in this region contains 1.0 J of electromagnetic energy? (c = 3.0 × 108 m/s, ,

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? , ,

The total electromagnetic power emitted by the sun is 3.8 × 1026 W.What is the radiation pressure on a totally absorbing satellite at the orbit of Mercury,which has an orbital radius of 5.8 × 1010 m? ,μ0 = 4π × 10-7 T • m/A,

The energy per unit volume in an electromagnetic wave is

When an electromagnetic wave falls on a white,perfectly reflecting surface,it exerts a force F on that surface.If the surface is now painted a perfectly absorbing black,what will be the force that the same wave will exert on the surface?

If the magnetic field of an electromagnetic wave is in the +x-direction and the electric field of the wave is in the +y-direction,the wave is traveling in the

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,

An electromagnetic wave is propagating towards the west.At a certain moment the direction of the magnetic field vector associated with this wave points vertically up.The direction of the electric field vector of this wave is

A very small source of light that radiates uniformly in all directions produces an electric field amplitude of 2.96 V/m at a point 33.0 m from the source.What is the power output from the source? μ0 = 4π × 10-7 T • m/A,ε0 = 8.85 × 10-12 C2/N • m2)

Units,physical Quantities,and Vectors

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

Direct-Current Circuits

Magnetic Field and Magnetic Forces

Sources of Magnetic Field

Electromagnetic Induction

Inductance

Alternating Current

The Nature and Propagation of Light

Geometric Optics

Interference

Diffraction

Relativity

Photons: Light Waves Behaving As Particles

Particles Behaving As Waves

Quantum Mechanics

Atomic Structure

Molecules and Condensed Matter

Nuclear Physics

Particle Physics and Cosmology

Filters

If the intensity of an electromagnetic wave is 80 MW/m²,what is the amplitude of the magnetic field of this wave? (c = 3.0 × 10⁸ m/s,μ₀ = 4π × 10^-7 T • m/A,

A planar electromagnetic wave is propagating in the +x direction.At a certain point P and at a given instant,the electric field of the wave is given by = (0.082 V/m) .What is the magnetic vector of the wave at the point P at that instant? (c = 3.0 × 10⁸ m/s)

Near the earth the intensity of radiation from the sun is 1.35 kW/m².What volume of space in this region contains 1.0 J of electromagnetic energy? (c = 3.0 × 10⁸ m/s, ,

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? , ,

The total electromagnetic power emitted by the sun is 3.8 × 10²⁶ W.What is the radiation pressure on a totally absorbing satellite at the orbit of Mercury,which has an orbital radius of 5.8 × 10¹⁰ m? ,μ₀ = 4π × 10^-7 T • m/A,

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,

A very small source of light that radiates uniformly in all directions produces an electric field amplitude of 2.96 V/m at a point 33.0 m from the source.What is the power output from the source? μ₀ = 4π × 10^-7 T • m/A,ε₀ = 8.85 × 10^-12 C²/N • m²)