Question 1

What is the maximum radiation pressure exerted by sunlight in space (S = 1 350 W/m2)on a highly polished silver surface?

Accepted Answer

A) 1.4 *10 - 2 Pa 
B) 0.12 Pa 
C) 9.0 *10 - 6 Pa 
D) 4.5 *10 - 5 Pa 
E) 2.3 * 10 - 6 Pa 
A) 1.4 *10 - 2 Pa 
B) 0.12 Pa 
C) 9.0 *10 - 6 Pa 
D) 4.5 *10 - 5 Pa 
E) 2.3 * 10 - 6 Pa

Question 2

The magnetic field of a plane-polarized electromagnetic wave moving in the z-direction is given by 
$B = 1.2 \times 10 ^ { - 6 } \sin \left[ 2 \pi \left( \frac { z } { 240 } - \frac { t \times 10 ^ { 7 } } { 8 } \right) \right]$
 in SI units.What is the speed of the EM wave?

Accepted Answer

A) 3* 108 m/s 
B) 100 m/s 
C) 106 m/s 
D) 2 * 107 m/s 
E) 2 * 108 m/s 
A) 3* 108 m/s 
B) 100 m/s 
C) 106 m/s 
D) 2 * 107 m/s 
E) 2 * 108 m/s

Question 3

You can raise the temperature of an object with

Accepted Answer

A) microwaves. 
B) infrared waves. 
C) ultraviolet rays. 
D) all of the above. 
E) only (a)and (b)above. 
A) microwaves. 
B) infrared waves. 
C) ultraviolet rays. 
D) all of the above. 
E) only (a)and (b)above.

Question 4

A 100-kW radio station emits EM waves in all directions from an antenna on top of a mountain.What is the intensity of the signal at a distance of 10 km?

Accepted Answer

A) 8*10 - 5 W/m2 
B) 8 *10 - 6 W/m2 
C) 3 *10 - 3 W/m2 
D) 0.8 W/m2 
E) 2.5 *10 1- 5 W/m2 
A) 8*10 - 5 W/m2 
B) 8 *10 - 6 W/m2 
C) 3 *10 - 3 W/m2 
D) 0.8 W/m2 
E) 2.5 *10 1- 5 W/m2

Question 5

Since $\varepsilon$0 = 8.85 *10 - 12 C2 / N . m2,the units of $\varepsilon$0E2 can be reduced to

Accepted Answer

A)  $\frac { \mathrm { J } } { \mathrm { s } \cdot \mathrm { m } ^ { 3 } }$ 
B)  $$\frac { \mathrm { N } } { \mathrm { s } \cdot \mathrm { m } ^ { 3 } }$$ . 
C)  $$\frac { \mathrm { J } } { \mathrm { m } ^ { 3 } }$$ 
D)  $\frac { \mathrm { N } } { \mathrm { m } ^ { 3 } }$ 
E)  $\frac { w } { m ^ { 3 } }$ 
A)  $\frac { \mathrm { J } } { \mathrm { s } \cdot \mathrm { m } ^ { 3 } }$ 
B)  $$\frac { \mathrm { N } } { \mathrm { s } \cdot \mathrm { m } ^ { 3 } }$$ . 
C)  $$\frac { \mathrm { J } } { \mathrm { m } ^ { 3 } }$$ 
D)  $\frac { \mathrm { N } } { \mathrm { m } ^ { 3 } }$ 
E)  $\frac { w } { m ^ { 3 } }$

Question 6

Two identical silver spheres of mass m and radius r are placed a distance R (sphere 1)and 2R (sphere 2)from the sun respectively.The ratio of the pressure of solar radiation on sphere 2 to that on sphere 1 is

Accepted Answer

A) 0.25. 
B) 0.50. 
C) 1.0. 
D) 2.0. 
E) 4.0. 
A) 0.25. 
B) 0.50. 
C) 1.0. 
D) 2.0. 
E) 4.0.

Question 7

When E and B are the amplitudes of the electric and magnetic fields in an electromagnetic wave in vacuum,the total average energy density in the wave is

Accepted Answer

A)  $\frac { 1 } { 4 } \varepsilon _ { 0 } E ^ { 2 }$ . 
B)  $\frac { 1 } { 2 } \varepsilon _ { 0 } E ^ { 2 }$ . 
C) $\varepsilon$0E2. 
D)  $\frac { B ^ { 2 } } { \mu _ { 0 } }$ . 
E)  $\frac { E B } { \mu _ { 0 } }$ . 
A)  $\frac { 1 } { 4 } \varepsilon _ { 0 } E ^ { 2 }$ . 
B)  $\frac { 1 } { 2 } \varepsilon _ { 0 } E ^ { 2 }$ . 
C) $\varepsilon$0E2. 
D)  $\frac { B ^ { 2 } } { \mu _ { 0 } }$ . 
E)  $\frac { E B } { \mu _ { 0 } }$ .

Question 8

The speed of light is given by the value of

Accepted Answer

A) $\varepsilon$0$\mu$0. 
B)  $\sqrt { \varepsilon _ { 0 } \mu _ { 0 } }$ . 
C)  $\frac { 1 } { \sqrt { \varepsilon _ { 0 } \mu _ { 0 } } }$ . 
D)  $\frac { 1 } { \varepsilon _ { 0 } \mu _ { 0 } }$ . 
E)  $\sqrt { \frac { \varepsilon _ { 0 } } { \mu _ { 0 } } }$ . 
A) $\varepsilon$0$\mu$0. 
B)  $\sqrt { \varepsilon _ { 0 } \mu _ { 0 } }$ . 
C)  $\frac { 1 } { \sqrt { \varepsilon _ { 0 } \mu _ { 0 } } }$ . 
D)  $\frac { 1 } { \varepsilon _ { 0 } \mu _ { 0 } }$ . 
E)  $\sqrt { \frac { \varepsilon _ { 0 } } { \mu _ { 0 } } }$ .

Question 9

If the maximum E-component of an electromagnetic wave is 600 V/m,what is the maximum B-component?

Accepted Answer

A) 1.4 T 
B) 1.8 *10 - 5 T 
C) 2.0 / 10 * 6 T 
D) 1.0 *10 - 3 T 
E) 1.6 *10 - 10 T 
A) 1.4 T 
B) 1.8 *10 - 5 T 
C) 2.0 / 10 * 6 T 
D) 1.0 *10 - 3 T 
E) 1.6 *10 - 10 T

Question 10

Find the frequency of X-rays of wavelength 1 Å = 10-10 m.

Accepted Answer

A) 3 * 1018 Hz 
B) 3 * 1010 MHz 
C) 6 * 109 Hz 
D) 3 * 108 Hz 
E) 3 *1020 Hz 
A) 3 * 1018 Hz 
B) 3 * 1010 MHz 
C) 6 * 109 Hz 
D) 3 * 108 Hz 
E) 3 *1020 Hz

Question 11

The intensity of radiation reaching the earth from the sun is 1 350 W/m2.The earth's radius is 6.4 * 106 m.How big a force does this radiation exert on the earth? (Assume it is all absorbed. )

Accepted Answer

A) 5.8 * 108 N 
B) 1.2 * 109 N 
C) 2.3 * 109 N 
D) 4.6 *109 N 
E) 1.7 *1017 N 
A) 5.8 * 108 N 
B) 1.2 * 109 N 
C) 2.3 * 109 N 
D) 4.6 *109 N 
E) 1.7 *1017 N

Question 12

An FM radio station broadcasts at 98.6 MHz.What is the wavelength of the radiowaves?

Accepted Answer

A) 60.8 m 
B) 6.08 m 
C) 3.04 m 
D) 0.314 m 
E) 0.33 cm 
A) 60.8 m 
B) 6.08 m 
C) 3.04 m 
D) 0.314 m 
E) 0.33 cm

Question 13

Near the surface of the planet,the Earth's magnetic field is about 0.50 *10 1- 4 T.How much energy is stored in 1.0 m3 of the atmosphere because of this field?

Accepted Answer

9.9 *10 <s

Question 14

Green light has a wavelength of 5.4 *10-7 m.What is the frequency of this EM-wave in air?

Accepted Answer

A) 5.55 * 1014 Hz 
B) 6.00 *1011 Hz 
C) 9.00* 108 Hz 
D) 3.00 * 1010 MHz 
E) 1.80* 1015 Hz 
A) 5.55 * 1014 Hz 
B) 6.00 *1011 Hz 
C) 9.00* 108 Hz 
D) 3.00 * 1010 MHz 
E) 1.80* 1015 Hz

Question 15

The magnetic field amplitude in an electromagnetic wave in vacuum is related to the electric field amplitude by B =

Accepted Answer

A)  $\frac { E } { c }$ 
B)  $$\frac { E } { \sqrt { c } }$$ 
C) E 
D)  $E \sqrt { c }$ 
E) cE 
A)  $\frac { E } { c }$ 
B)  $$\frac { E } { \sqrt { c } }$$ 
C) E 
D)  $E \sqrt { c }$ 
E) cE

Question 16

Magnetic fields are produced by

Accepted Answer

A) constant electric currents. 
B) electric currents that vary sinusoidally with time. 
C) time-varying electric fields. 
D) all of the above. 
E) only (a)and (b)above. 
A) constant electric currents. 
B) electric currents that vary sinusoidally with time. 
C) time-varying electric fields. 
D) all of the above. 
E) only (a)and (b)above.

Question 17

The magnetic field of a plane-polarized electromagnetic wave moving in the z-direction is given by 
$B = 1.2 \times 10 ^ { - 6 } \sin \left[ 2 \pi \left( \frac { z } { 240 } - \frac { t \times 10 ^ { 7 } } { 8 } \right) \right]$
 in SI units.What is the wavelength of the EM wave?

Accepted Answer

A) 120 m 
B) 240 m 
C) 60 m 
D) 100 m 
E) 360 m 
A) 120 m 
B) 240 m 
C) 60 m 
D) 100 m 
E) 360 m

Question 18

A plane parallel plate capacitor has plates of 10 cm2 area that are 1.0 mm apart.At an instant when charge is being accumulated on the plates at a rate of 12 nC/s,the displacement current between the plates is

Accepted Answer

A) 1.06* 10 - 16 A. 
B) 1.2 *10 - 8 A. 
C) 8.85 * 10 - 9 A. 
D) 1.00 A. 
E) 1.36 A. 
A) 1.06* 10 - 16 A. 
B) 1.2 *10 - 8 A. 
C) 8.85 * 10 - 9 A. 
D) 1.00 A. 
E) 1.36 A.

Question 19

The correct form of Ampere's law for circuits with gaps in them is

Accepted Answer

A)  $\oint \mathrm { B } \cdot d \mathbf { s } = 0$ . 
B)  $\oint \mathbf { B } \cdot d \mathbf { s } = I _ { \text {enciosed } }$ . 
C)  $\oint \mathbf { B } \cdot d \mathbf { s } = \mu _ { 0 } I _ { \text {enclosed } }$ . 
D)  $\oint \mathbf { B } \cdot d \mathbf { s } = \mu _ { 0 } I _ { \text {enclosed } } + \mu _ { 0 } \varepsilon _ { 0 } \frac { d \Phi _ { E } } { d t }$ . 
E)  $\oint \mathbf { B } \cdot d \mathbf { s } = \mu _ { 0 } I _ { \text {enclosed } } + \mu _ { 0 } \varepsilon _ { 0 } \frac { d \Phi _ { I } } { d t } - \frac { \varepsilon _ { 0 } } { \left( \mu _ { 0 } \right) ^ { 2 } } \frac { d \Phi _ { B } } { d t }$ . 
A)  $\oint \mathrm { B } \cdot d \mathbf { s } = 0$ . 
B)  $\oint \mathbf { B } \cdot d \mathbf { s } = I _ { \text {enciosed } }$ . 
C)  $\oint \mathbf { B } \cdot d \mathbf { s } = \mu _ { 0 } I _ { \text {enclosed } }$ . 
D)  $\oint \mathbf { B } \cdot d \mathbf { s } = \mu _ { 0 } I _ { \text {enclosed } } + \mu _ { 0 } \varepsilon _ { 0 } \frac { d \Phi _ { E } } { d t }$ . 
E)  $\oint \mathbf { B } \cdot d \mathbf { s } = \mu _ { 0 } I _ { \text {enclosed } } + \mu _ { 0 } \varepsilon _ { 0 } \frac { d \Phi _ { I } } { d t } - \frac { \varepsilon _ { 0 } } { \left( \mu _ { 0 } \right) ^ { 2 } } \frac { d \Phi _ { B } } { d t }$ .

Question 20

The Earth is 1.49* 1011 meters from the sun.If the solar radiation at the top of the Earth's atmosphere is 1 340 W/m2,what is the total power output of the sun?

Accepted Answer

A) 7.10 * 1027 W 
B) 2.20 * 1030 W 
C) 6.62 * 1026 W 
D) 3.74 * 1026 W 
E) 2.98 * 1025 W 
A) 7.10 * 1027 W 
B) 2.20 * 1030 W 
C) 6.62 * 1026 W 
D) 3.74 * 1026 W 
E) 2.98 * 1025 W

Exam 24: Electromagnetic Waves

What is the maximum radiation pressure exerted by sunlight in space (S = 1 350 W/m2)on a highly polished silver surface?

You can raise the temperature of an object with

A 100-kW radio station emits EM waves in all directions from an antenna on top of a mountain.What is the intensity of the signal at a distance of 10 km?

Since ε\varepsilonε 0 = 8.85 *10 - 12 C2 / N . m2,the units of ε\varepsilonε 0E2 can be reduced to

Two identical silver spheres of mass m and radius r are placed a distance R (sphere 1)and 2R (sphere 2)from the sun respectively.The ratio of the pressure of solar radiation on sphere 2 to that on sphere 1 is

When E and B are the amplitudes of the electric and magnetic fields in an electromagnetic wave in vacuum,the total average energy density in the wave is

The speed of light is given by the value of

If the maximum E-component of an electromagnetic wave is 600 V/m,what is the maximum B-component?

Find the frequency of X-rays of wavelength 1 Å = 10-10 m.

The intensity of radiation reaching the earth from the sun is 1 350 W/m2.The earth's radius is 6.4 * 106 m.How big a force does this radiation exert on the earth? (Assume it is all absorbed. )

An FM radio station broadcasts at 98.6 MHz.What is the wavelength of the radiowaves?

Near the surface of the planet,the Earth's magnetic field is about 0.50 *10 1- 4 T.How much energy is stored in 1.0 m3 of the atmosphere because of this field?

Green light has a wavelength of 5.4 *10-7 m.What is the frequency of this EM-wave in air?

The magnetic field amplitude in an electromagnetic wave in vacuum is related to the electric field amplitude by B =

Magnetic fields are produced by

A plane parallel plate capacitor has plates of 10 cm2 area that are 1.0 mm apart.At an instant when charge is being accumulated on the plates at a rate of 12 nC/s,the displacement current between the plates is

The correct form of Ampere's law for circuits with gaps in them is

The Earth is 1.49* 1011 meters from the sun.If the solar radiation at the top of the Earth's atmosphere is 1 340 W/m2,what is the total power output of the sun?

Introduction and Vectors

Motion in One Dimension

Motion in Two Dimensions

The Laws of Motion

More Applications of Newtons Laws

Energy of a System

Conservation of Energy

Momentum and Collisions

Relativity

Rotational Motion

Gravity,planetary Orbits,and the Hydrogen Atom

Oscillatory Motion

Mechanical Waves

Superposition and Standing Waves

Fluid Mechanics

Temperature and the Kinetic Theory of Gases

Energy in Thermal Processes: the First Law of Thermodynamics

Heat Engines,entropy,and the Second Law of Thermodynamics

Electric Forces and Electric Fields

Electric Potential and Capacitance

Current and Direct Current Circuits

Magnetic Forces and Magnetic Fields

Faradays Law and Inductance

Reflection and Refraction of Light

Image Formation by Mirrors and Lenses

Wave Optics

Quantum Physics

Atomic Physics

Nuclear Physics

Particle Physics

Filters

What is the maximum radiation pressure exerted by sunlight in space (S = 1 350 W/m²)on a highly polished silver surface?

Since $\varepsilon$ ₀ = 8.85 *10 ^- ¹² C² / N . m²,the units of $\varepsilon$ ₀E² can be reduced to

Find the frequency of X-rays of wavelength 1 Å = 10^-¹⁰ m.

The intensity of radiation reaching the earth from the sun is 1 350 W/m².The earth's radius is 6.4 * 10⁶ m.How big a force does this radiation exert on the earth? (Assume it is all absorbed. )

Near the surface of the planet,the Earth's magnetic field is about 0.50 *10 1^- ⁴ T.How much energy is stored in 1.0 m³ of the atmosphere because of this field?

Green light has a wavelength of 5.4 *10^-⁷ m.What is the frequency of this EM-wave in air?

A plane parallel plate capacitor has plates of 10 cm² area that are 1.0 mm apart.At an instant when charge is being accumulated on the plates at a rate of 12 nC/s,the displacement current between the plates is

The Earth is 1.49* 10¹¹ meters from the sun.If the solar radiation at the top of the Earth's atmosphere is 1 340 W/m²,what is the total power output of the sun?