Question 1

The index of refraction of a certain glass is 1.50. The sine of the critical angle for total internal reflection at a glass-air interface is:

Accepted Answer

A)  0.50 
B)  0.67 
C)  0.75 
D)  1.00 
E)  1.50 
A)  0.50 
B)  0.67 
C)  0.75 
D)  1.00 
E)  1.50 B

Question 2

The illustration shows total internal reflection taking place in apeice of glass. The index of refraction of this glass:

Accepted Answer

A)  at least 2.0 
B)  at most 2.0 
C)  at least 1.15 
D)  at most 1.15 
E)  cannot be calculated from the given data 
A)  at least 2.0 
B)  at most 2.0 
C)  at least 1.15 
D)  at most 1.15 
E)  cannot be calculated from the given data C

Question 3

The sun is about 1.5 * 1011 m away. The time for light to travel this distance is about:

Accepted Answer

A)  4.5 * 1018 s 
B)  8 s 
C)  8 min 
D)  8 hr 
E)  8 yr 
A)  4.5 * 1018 s 
B)  8 s 
C)  8 min 
D)  8 hr 
E)  8 yr C

Question 4

Visible light has a frequency of about:

Accepted Answer

A)  5 * 1018 Hz 
B)  5 * 1016 Hz 
C)  5 * 1014 Hz 
D)  5 * 1012 Hz 
E)  5 *1010 Hz 
A)  5 * 1018 Hz 
B)  5 * 1016 Hz 
C)  5 * 1014 Hz 
D)  5 * 1012 Hz 
E)  5 *1010 Hz

Question 5

Radio waves differ from visible light waves in that radio waves:

Accepted Answer

A)  travel slower 
B)  have a higher frequency 
C)  travel faster 
D)  have a lower frequency 
E)  require a material medium 
A)  travel slower 
B)  have a higher frequency 
C)  travel faster 
D)  have a lower frequency 
E)  require a material medium

Question 6

As light goes from one medium to another, it is bent away from the normal. Then:

Accepted Answer

A)  the speed of the light has increased 
B)  dispersion must occur 
C)  the second medium has a higher index of refraction 
D)  no change in speed has occurred 
E)  refraction has not occurred because refraction means a bending toward the normal 
A)  the speed of the light has increased 
B)  dispersion must occur 
C)  the second medium has a higher index of refraction 
D)  no change in speed has occurred 
E)  refraction has not occurred because refraction means a bending toward the normal

Question 7

When light travels from medium X to medium Y as shown:

Accepted Answer

A)  both the speed and the frequency decrease 
B)  both the speed and the frequency increase 
C)  both the speed and the wavelength decrease 
D)  both the speed and the wavelength increase 
E)  both the wavelength and the frequency are unchanged 
A)  both the speed and the frequency decrease 
B)  both the speed and the frequency increase 
C)  both the speed and the wavelength decrease 
D)  both the speed and the wavelength increase 
E)  both the wavelength and the frequency are unchanged

Question 8

The product   has the same units as:

Accepted Answer

A)  (velocity)2 
B)  (velocity)1/2 
C)  1/velocity 
D)  1/velocity2 
E)  1/velocity1/2 
A)  (velocity)2 
B)  (velocity)1/2 
C)  1/velocity 
D)  1/velocity2 
E)  1/velocity1/2

Question 9

The electric field in unpolarized light:

Accepted Answer

A)  has no direction at any time 
B)  rotates rapidly 
C)  is always parallel to the direction of propagation 
D)  changes direction randomly and often 
E)  remains along the same line but reverses direction randomly and often 
A)  has no direction at any time 
B)  rotates rapidly 
C)  is always parallel to the direction of propagation 
D)  changes direction randomly and often 
E)  remains along the same line but reverses direction randomly and often

Question 10

As used in the laws of reflection and refraction, the "normal" direction is:

Accepted Answer

A)  any convenient direction 
B)  tangent to the interface 
C)  along the incident ray 
D)  perpendicular to the electric field vector of the light 
E)  perpendicular to the interface 
A)  any convenient direction 
B)  tangent to the interface 
C)  along the incident ray 
D)  perpendicular to the electric field vector of the light 
E)  perpendicular to the interface

Question 11

The diagram shows the passage of a ray of light from air into a substance X. The index of refraction of X is:

Accepted Answer

A)  0.53 
B)  0.88 
C)  1.9 
D)  2.2 
E)  3.0 
A)  0.53 
B)  0.88 
C)  1.9 
D)  2.2 
E)  3.0

Question 12

Radio waves of wavelength 3 cm have a frequency of:

Accepted Answer

A)  1 MHz 
B)  9 MHz 
C)  100 MHz 
D)  10,000 MHz 
E)  900 MHz 
A)  1 MHz 
B)  9 MHz 
C)  100 MHz 
D)  10,000 MHz 
E)  900 MHz

Question 13

The index of refraction for diamond is 2.5. Which of the following is correct for the situation shown?

Accepted Answer

A)  (sin a)/(sin b) = 2.5 
B)  (sin b)/(sin d) = 2.5 
C)  (cos a)/(cos c) = 2.5 
D)  (sin a)/(sin c) = 1/(2.5) 
E)  a/c = 2.5 
A)  (sin a)/(sin b) = 2.5 
B)  (sin b)/(sin d) = 2.5 
C)  (cos a)/(cos c) = 2.5 
D)  (sin a)/(sin c) = 1/(2.5) 
E)  a/c = 2.5

Question 14

Of the following human eyes are most sensitive to:

Accepted Answer

A)  red light 
B)  violet light 
C)  blue light 
D)  green light 
E)  none of these (they are equally sensitive to all colors) 
A)  red light 
B)  violet light 
C)  blue light 
D)  green light 
E)  none of these (they are equally sensitive to all colors)

Question 15

Maxwell's equations predict that the speed of electromagnetic waves in free space is given by:

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

Question 16

The speed of light in vacuum is about:

Accepted Answer

A)  1100 ft/s 
B)  93* 106 mi/s 
C)  6 *1023 m/s 
D)  3 *1010 cm/s 
E)  186,000 mph 
A)  1100 ft/s 
B)  93* 106 mi/s 
C)  6 *1023 m/s 
D)  3 *1010 cm/s 
E)  186,000 mph

Question 17

The light intensity 10 m from a point source is 1000 W/m2. The intensity 100 m from the same source is:

Accepted Answer

A)  1000 W/m2 
B)  100 W/m2 
C)  10 W/m2 
D)  1 W/m2 
E)  0.1 W/m2 
A)  1000 W/m2 
B)  100 W/m2 
C)  10 W/m2 
D)  1 W/m2 
E)  0.1 W/m2

Question 18

The separation of white light into colors by a prism is associated with:

Accepted Answer

A)  total internal reflection 
B)  partial reflection from each surface 
C)  variation of index of refraction with wavelength 
D)  a decrease in the speed of light in the glass 
E)  selective absorption of various colors 
A)  total internal reflection 
B)  partial reflection from each surface 
C)  variation of index of refraction with wavelength 
D)  a decrease in the speed of light in the glass 
E)  selective absorption of various colors

Question 19

For an electromagnetic wave the direction of the vector   gives:

Accepted Answer

A)  the direction of the electric field 
B)  the direction of the magnetic field 
C)  the direction of wave propagation 
D)  the direction of the electromagnetic force on a proton 
E)  the direction of the emf induced by the wave 
A)  the direction of the electric field 
B)  the direction of the magnetic field 
C)  the direction of wave propagation 
D)  the direction of the electromagnetic force on a proton 
E)  the direction of the emf induced by the wave

Question 20

If the electric field in a plane electromagnetic wave is given by Emsin[(3 *106/m-1)x -  $ \omega $t)], in SI the value of  $ \omega $is:

Accepted Answer

A)  0.01 rad/s 
B)  10 rad/s 
C)  100 rad/s 
D)  9*1014 rad/s 
E)  9 *1016 rad/s 
A)  0.01 rad/s 
B)  10 rad/s 
C)  100 rad/s 
D)  9*1014 rad/s 
E)  9 *1016 rad/s

Exam 33: Electromagnetic Waves

The index of refraction of a certain glass is 1.50. The sine of the critical angle for total internal reflection at a glass-air interface is:

The illustration shows total internal reflection taking place in apeice of glass. The index of refraction of this glass:

The sun is about 1.5 * 1011 m away. The time for light to travel this distance is about:

Visible light has a frequency of about:

Radio waves differ from visible light waves in that radio waves:

As light goes from one medium to another, it is bent away from the normal. Then:

When light travels from medium X to medium Y as shown:

The product has the same units as:

The electric field in unpolarized light:

As used in the laws of reflection and refraction, the "normal" direction is:

The diagram shows the passage of a ray of light from air into a substance X. The index of refraction of X is:

Radio waves of wavelength 3 cm have a frequency of:

The index of refraction for diamond is 2.5. Which of the following is correct for the situation shown?

Of the following human eyes are most sensitive to:

Maxwell's equations predict that the speed of electromagnetic waves in free space is given by:

The speed of light in vacuum is about:

The light intensity 10 m from a point source is 1000 W/m2. The intensity 100 m from the same source is:

The separation of white light into colors by a prism is associated with:

For an electromagnetic wave the direction of the vector gives:

If the electric field in a plane electromagnetic wave is given by Emsin[(3 *106/m-1)x - ω \omega ω t)], in SI the value of ω \omega ω is:

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The illustration shows total internal reflection taking place in apeice of glass. The index of refraction of this glass: $The illustration shows total internal reflection taking place in apeice of glass. The index of refraction of this glass:$

The sun is about 1.5 * 10¹¹ m away. The time for light to travel this distance is about:

The diagram shows the passage of a ray of light from air into a substance X. The index of refraction of X is: $The diagram shows the passage of a ray of light from air into a substance X. The index of refraction of X is:$

The index of refraction for diamond is 2.5. Which of the following is correct for the situation shown? $The index of refraction for diamond is 2.5. Which of the following is correct for the situation shown?$

The light intensity 10 m from a point source is 1000 W/m². The intensity 100 m from the same source is:

If the electric field in a plane electromagnetic wave is given by E_msin[(3 *10⁶/m^-¹)x - $\omega$ t)], in SI the value of $\omega$ is: