Question 1

If light has a wavelength of 600 nm in a vacuum,what is its wavelength in a material with an index of refraction of 1.50?

Accepted Answer

A)  600 nm 
B)  900 nm 
C)  400 nm 
D)  1.35 $\times$ 103 nm 
E)  267 nm 
A)  600 nm 
B)  900 nm 
C)  400 nm 
D)  1.35 $\times$ 103 nm 
E)  267 nm C

Question 2

For electromagnetic radiation of intensity of 1.00 W/m2,what is the rms value of the electric field?

Accepted Answer

A)  19.4 V/m 
B)  9.69 V/m 
C)  6.45 $\times$ 10-8 V/m 
D)  9.11 $\times$ 10-8 V/m 
E)  3.00 $\times$ 107 V/m 
A)  19.4 V/m 
B)  9.69 V/m 
C)  6.45 $\times$ 10-8 V/m 
D)  9.11 $\times$ 10-8 V/m 
E)  3.00 $\times$ 107 V/m A

Question 3

Light of wavelength 600 nm in air goes into a medium where the index of refraction is 1.73.What is the frequency of this light in the medium?

Accepted Answer

A)  5.00 $\times$ 1014 Hz 
B)  2.89 $\times$ 1014 Hz 
C)  8.65 $\times$ 1014 Hz 
D)  3.46 $\times$ 1014 Hz 
E)  1.04 $\times$ 1014 Hz 
A)  5.00 $\times$ 1014 Hz 
B)  2.89 $\times$ 1014 Hz 
C)  8.65 $\times$ 1014 Hz 
D)  3.46 $\times$ 1014 Hz 
E)  1.04 $\times$ 1014 Hz A

Question 4

The light from a distant star is shifted such that the peak of its spectrum, at 620 nm ,is shifted to 635 nm.What is its radial velocity relative to Earth?

Accepted Answer

A)  -0.11c 
B)  -0.024c 
C)  -0.15c 
D)  -0.012c 
A)  -0.11c 
B)  -0.024c 
C)  -0.15c 
D)  -0.012c

Question 5

The background radiation in space corresponds to what temperature blackbody radiation?

Accepted Answer

A)  0 K 
B)  2.7 K 
C)  273 K 
D)  5800 K 
E)  98.6$^{\circ}$F 
A)  0 K 
B)  2.7 K 
C)  273 K 
D)  5800 K 
E)  98.6$^{\circ}$F

Question 6

The rms Electric field strength at a distance r from a 25 W light source is found to be 4.33 N/C.What is the distance r?

Accepted Answer

A)  22 m 
B)  6.3 m 
C)  30 m 
D)  40 m 
A)  22 m 
B)  6.3 m 
C)  30 m 
D)  40 m

Question 7

Which of the following is the direction of an electromagnetic wave having electric and magnetic vectors E and B?

Accepted Answer

A)  E 
B)  B 
C)  E·B 
D)  E $\times$ B 
E)  B $\times$ E 
A)  E 
B)  B 
C)  E·B 
D)  E $\times$ B 
E)  B $\times$ E

Question 8

What is the wavelength from a radio station having frequency 107.7 MHz?

Accepted Answer

A)  2.790 m 
B)  27.90 m 
C)  32.30 m 
D)  323.0 m 
E)  108.0 m 
A)  2.790 m 
B)  27.90 m 
C)  32.30 m 
D)  323.0 m 
E)  108.0 m

Question 9

Electromagnetic wavelengths of a few centimeters are classified as in what range?

Accepted Answer

A)  visible 
B)  ultraviolet 
C)  microwave 
D)  radio 
E)  gamma ray 
A)  visible 
B)  ultraviolet 
C)  microwave 
D)  radio 
E)  gamma ray

Question 10

An electromagnetic wave is created by

Accepted Answer

A)  an electrical charge moving at a certain velocity. 
B)  all electric charges. 
C)  a magnetic moving with a certain velocity. 
D)  an accelerating electric charge. 
A)  an electrical charge moving at a certain velocity. 
B)  all electric charges. 
C)  a magnetic moving with a certain velocity. 
D)  an accelerating electric charge.

Question 11

The highest frequency in visible light is associated with the color

Accepted Answer

A)  red. 
B)  orange. 
C)  green. 
D)  blue. 
E)  violet. 
A)  red. 
B)  orange. 
C)  green. 
D)  blue. 
E)  violet.

Question 12

Plane polarized light of intensity I0 is sent through a polarizer rotated 45$^{\circ}$clockwise to the original plane of polarization and then through a second polarizer rotated 45$^{\circ}$ counter-clockwise measured from the original plane of polarization.What is the transmitted intensity?

Accepted Answer

A)  0.71 I0 
B)  0.50 I0 
C)  0.35 I0 
D)  0.25 I0 
E)  0 
A)  0.71 I0 
B)  0.50 I0 
C)  0.35 I0 
D)  0.25 I0 
E)  0

Question 13

In vacuum,the components of an EM wave are Ey = 50( V/m )cos[(5.00 m-1)x + $\omega$t], Ex = 0, and Ez = 0.What is the wavelength of the wave?

Accepted Answer

A)  5.00 m 
B)  0.200 m 
C)  1.26 m 
D)  2.52 m 
E)  0.796 m 
A)  5.00 m 
B)  0.200 m 
C)  1.26 m 
D)  2.52 m 
E)  0.796 m

Question 14

You wish to read from a single lightbulb in a lamp at your desk.In order to get the same brightness on the page from a 25 W bulb as you can from 100 W bulb,how much closer do you need to bring the lamp to your book? Assume that the light bulbs are equally efficient.

Accepted Answer

A)  1/2 the distance 
B)  1/8 the distance 
C)  1/4 the distance 
D)  1/16 the distance 
A)  1/2 the distance 
B)  1/8 the distance 
C)  1/4 the distance 
D)  1/16 the distance

Question 15

What is the intensity of the electromagnetic radiation at a distance of 2.00 m from a 100 W isotropic source?

Accepted Answer

A)  25.0 W/m2 
B)  6.25 W/m2 
C)  4.00 W/m2 
D)  1.99 W/m2 
E)  1.00 W/m2 
A)  25.0 W/m2 
B)  6.25 W/m2 
C)  4.00 W/m2 
D)  1.99 W/m2 
E)  1.00 W/m2

Question 16

In vacuum,the components of an EM wave are Ey = 50( V/m ) cos [(5.00 m-1)x + $\omega$t], Ex = 0, and Ez = 0.In what direction is this wave moving?

Accepted Answer

A)  positive x-direction 
B)  negative x-direction 
C)  positive y-direction 
D)  negative y-direction 
E)  positive or negative z-direction 
A)  positive x-direction 
B)  negative x-direction 
C)  positive y-direction 
D)  negative y-direction 
E)  positive or negative z-direction

Question 17

If the rms value of the electric field is 9.0 V/m at a distance of 6.0 m from an isotropic source,what is the rms value of the magnetic field at a distance of 12 m from the source?

Accepted Answer

A)  3.0 $\times$ 10-8 T 
B)  1.5 $\times$ 10-8 T 
C)  0.75 $\times$ 10-8 T 
D)  0.38 $\times$ 10-8 T 
E)  0.19 $\times$ 10-8 T 
A)  3.0 $\times$ 10-8 T 
B)  1.5 $\times$ 10-8 T 
C)  0.75 $\times$ 10-8 T 
D)  0.38 $\times$ 10-8 T 
E)  0.19 $\times$ 10-8 T

Question 18

The sun has a radius of 6.955 $\times$ 108 km and a rotational period of 25.38 days.What is the difference is there in the peak of the observed spectrum between light received from the approaching side of the Sun and from the receding side of the sun? Observations from the middle of the sun place the spectral peak at 480 nm.

Accepted Answer

A)  13 nm 
B)  6.4 nm 
C)  1.6 nm 
D)  3.2 nm 
A)  13 nm 
B)  6.4 nm 
C)  1.6 nm 
D)  3.2 nm

Question 19

In vacuum,the components of an EM wave are Ey = 50( V/m )cos[(5.0 m-1)x + $\omega$t], Ex = 0, and Ez = 0.What is the amplitude of the magnetic field for this wave?

Accepted Answer

A)  5.00 $\times$ 10-7 T 
B)  1.67 $\times$ 10-7 T 
C)  2.00 $\times$ 10-7 T 
D)  1.50 $\times$ 10-6 T 
E)  1.33 $\times$ 10-6 T 
A)  5.00 $\times$ 10-7 T 
B)  1.67 $\times$ 10-7 T 
C)  2.00 $\times$ 10-7 T 
D)  1.50 $\times$ 10-6 T 
E)  1.33 $\times$ 10-6 T

Question 20

The light from a distant star is that has a peak in its intensity spectrum at 620 nm and is moving at a rate of 0.024c towards Earth.What is the wavelength of the peak of its intensity spectrum,as observed on Earth?

Accepted Answer

A)  605 nm 
B)  591 nm 
C)  650 nm 
D)  635 nm 
A)  605 nm 
B)  591 nm 
C)  650 nm 
D)  635 nm

Exam 22: Electromagnetic Waves

If light has a wavelength of 600 nm in a vacuum,what is its wavelength in a material with an index of refraction of 1.50?

For electromagnetic radiation of intensity of 1.00 W/m2,what is the rms value of the electric field?

Light of wavelength 600 nm in air goes into a medium where the index of refraction is 1.73.What is the frequency of this light in the medium?

The light from a distant star is shifted such that the peak of its spectrum, at 620 nm ,is shifted to 635 nm.What is its radial velocity relative to Earth?

The background radiation in space corresponds to what temperature blackbody radiation?

The rms Electric field strength at a distance r from a 25 W light source is found to be 4.33 N/C.What is the distance r?

Which of the following is the direction of an electromagnetic wave having electric and magnetic vectors E and B?

What is the wavelength from a radio station having frequency 107.7 MHz?

Electromagnetic wavelengths of a few centimeters are classified as in what range?

An electromagnetic wave is created by

The highest frequency in visible light is associated with the color

In vacuum,the components of an EM wave are Ey = 50( V/m )cos[(5.00 m-1)x + ω\omegaω t], Ex = 0, and Ez = 0.What is the wavelength of the wave?

You wish to read from a single lightbulb in a lamp at your desk.In order to get the same brightness on the page from a 25 W bulb as you can from 100 W bulb,how much closer do you need to bring the lamp to your book? Assume that the light bulbs are equally efficient.

What is the intensity of the electromagnetic radiation at a distance of 2.00 m from a 100 W isotropic source?

In vacuum,the components of an EM wave are Ey = 50( V/m ) cos [(5.00 m-1)x + ω\omegaω t], Ex = 0, and Ez = 0.In what direction is this wave moving?

If the rms value of the electric field is 9.0 V/m at a distance of 6.0 m from an isotropic source,what is the rms value of the magnetic field at a distance of 12 m from the source?

In vacuum,the components of an EM wave are Ey = 50( V/m )cos[(5.0 m-1)x + ω\omegaω t], Ex = 0, and Ez = 0.What is the amplitude of the magnetic field for this wave?

The light from a distant star is that has a peak in its intensity spectrum at 620 nm and is moving at a rate of 0.024c towards Earth.What is the wavelength of the peak of its intensity spectrum,as observed on Earth?

Introduction

Force

Acceleration and Newtons Second Law of Motion

Motion With Constant Acceleration

Circular Motion

Conservation of Energy

Linear Momentum

Torque and Angular Momentum

Fluids

Elasticity and Oscillations

Waves

Sound

Temperature and the Ideal Gas

Heat

Thermodynamics

Electric Forces and Fields

Electric Potential

Electric Current and Circuits

Magnetic Forces and Fields

Electromagnetic Induction

Alternating Current

Reflection and Refraction of Light

Optical Instruments

Interference and Diffraction

Relativity

Early Quantum Physics and the Photon

Quantum Physics

Nuclear Physics

Particle Physics

Filters

For electromagnetic radiation of intensity of 1.00 W/m²,what is the rms value of the electric field?

In vacuum,the components of an EM wave are E_y = 50( V/m )cos[(5.00 m^-1)x + $\omega$ t], E_x = 0, and E_z = 0.What is the wavelength of the wave?

In vacuum,the components of an EM wave are E_y = 50( V/m ) cos [(5.00 m^-1)x + $\omega$ t], E_x = 0, and E_z = 0.In what direction is this wave moving?

In vacuum,the components of an EM wave are E_y = 50( V/m )cos[(5.0 m^-1)x + $\omega$ t], E_x = 0, and E_z = 0.What is the amplitude of the magnetic field for this wave?