Question 1

A ray of light passes obliquely through a plate of glass having parallel faces.The emerging ray:

Accepted Answer

A) is totally internally reflected 
B) is bent more toward the normal than the incident ray 
C) is bent further away from the normal than the incident ray 
D) is parallel to the incident ray but displaced sideways 
E) lies on the same straight line as the incident ray 
A) is totally internally reflected 
B) is bent more toward the normal than the incident ray 
C) is bent further away from the normal than the incident ray 
D) is parallel to the incident ray but displaced sideways 
E) lies on the same straight line as the incident ray

Question 2

The units of index of refraction are:

Accepted Answer

A) m/s 
B) s/m 
C) radian 
D) m/s2 
E) none of these 
A) m/s 
B) s/m 
C) radian 
D) m/s2 
E) none of these

Question 3

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 4

The diagrams show four pairs of polarizing sheets, with the polarizing directions indicated by dashed lines.The two sheets of each pair are placed one behind the other and the front sheet is illuminated by unpolarized light.The incident intensity is the same for all pairs of sheets.Rank the pairs according to the intensity of transmitted light, least to greatest.

Accepted Answer

A) 1, 2, 3, 4 
B) 4, 2, 1, 3 
C) 2, 4, 3, 1 
D) 2, 4, 1, 3 
E) 3, 1, 4, 2 
A) 1, 2, 3, 4 
B) 4, 2, 1, 3 
C) 2, 4, 3, 1 
D) 2, 4, 1, 3 
E) 3, 1, 4, 2

Question 5

For a beam of light in air (n = 1)reflecting off glass (n = 1.5), what is Brewster's angle?

Accepted Answer

A) 34° 
B) 42° 
C) 45° 
D) 48° 
E) 56° 
A) 34° 
B) 42° 
C) 45° 
D) 48° 
E) 56°

Question 6

Radio waves of wavelength 300 m have a frequency of:

Accepted Answer

A) 10-6 kHz 
B) 108 kHz 
C) 500 kHz 
D) 1 MHz 
E) 9 MHz 
A) 10-6 kHz 
B) 108 kHz 
C) 500 kHz 
D) 1 MHz 
E) 9 MHz

Question 7

An electromagnetic wave is generated by:

Accepted Answer

A) any moving charge 
B) any accelerating charge 
C) only a charge with changing acceleration 
D) only a charge moving in a circle 
E) only a charge moving in a straight line 
A) any moving charge 
B) any accelerating charge 
C) only a charge with changing acceleration 
D) only a charge moving in a circle 
E) only a charge moving in a straight line

Question 8

When the distance between a point source of light and a light meter is reduced from 6.0 m to 2.0 m, the intensity of illumination at the meter will be the original value multiplied by:

Accepted Answer

A) 3 
B) 9 
C) 1/3 
D) 1/9 
E) 1 
A) 3 
B) 9 
C) 1/3 
D) 1/9 
E) 1

Question 9

The index of refraction of benzene is 1.80.The critical angle for total internal reflection, at a benzene-air interface, is about:

Accepted Answer

A) 56$\degree$ 
B) 47$\degree$ 
C) 34$\degree$ 
D) 22$\degree$ 
E) 18$\degree$ 
A) 56$\degree$ 
B) 47$\degree$ 
C) 34$\degree$ 
D) 22$\degree$ 
E) 18$\degree$

Question 10

The relation $\theta$incident = $\theta$reflected, which applies as a ray of light strikes an interface between two media, is known as:

Accepted Answer

A) Faraday's law 
B) Snell's law 
C) Ampere's law 
D) Cole's law 
E) none of these 
A) Faraday's law 
B) Snell's law 
C) Ampere's law 
D) Cole's law 
E) none of these

Question 11

The dimensions of are:

Accepted Answer

A) J/m2 
B) J/s 
C) W/s 
D) W/m2 
E) J/m3 
A) J/m2 
B) J/s 
C) W/s 
D) W/m2 
E) J/m3

Question 12

If the amplitude of the electric field in a plane electromagnetic wave is 100 V/m then the amplitude of the magnetic field is:

Accepted Answer

A) 3.3 * 10-7 T 
B) 6.7 *10-7 T 
C) 0.27 T 
D) 8.0 * 107 T 
E) 3.0 * 1010 T 
A) 3.3 * 10-7 T 
B) 6.7 *10-7 T 
C) 0.27 T 
D) 8.0 * 107 T 
E) 3.0 * 1010 T

Question 13

A clear sheet of polarizing material is placed on top of a second, similar sheet so that their polarizing axes make an angle of 30$\degree$ with each other.The ratio of the intensity of emerging light to incident unpolarized light is:

Accepted Answer

A) 1:4 
B) 1:3 
C) 1:2 
D) 3:4 
E) 3:8 
A) 1:4 
B) 1:3 
C) 1:2 
D) 3:4 
E) 3:8

Question 14

Which of the following types of electromagnetic radiation travels at the greatest speed in vacuum?

Accepted Answer

A) Radio waves 
B) Visible light 
C) X rays 
D) Gamma rays 
E) All of these travel at the same speed 
A) Radio waves 
B) Visible light 
C) X rays 
D) Gamma rays 
E) All of these travel at the same speed

Question 15

The rectangular metal tank shown is filled with an unknown liquid.The observer, whose eye is level with the top of the tank, can just see corner E.The index of refraction of this liquid is:

Accepted Answer

A) 1.75 
B) 1.67 
C) 1.50 
D) 1.33 
E) 1.25 
A) 1.75 
B) 1.67 
C) 1.50 
D) 1.33 
E) 1.25

Question 16

The product µ0ε0 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 17

Light with an intensity of 1 kW/m2 falls normally on a surface and is completely absorbed.The radiation pressure is:

Accepted Answer

A) 1 kPa 
B) 3 *1011 Pa 
C) 1.7 *10-6 Pa 
D) 3.3 *10-6 Pa 
E) 6.7* 10-6 Pa 
A) 1 kPa 
B) 3 *1011 Pa 
C) 1.7 *10-6 Pa 
D) 3.3 *10-6 Pa 
E) 6.7* 10-6 Pa

Question 18

Evidence that electromagnetic waves carry momentum is:

Accepted Answer

A) the tail of a comet points away from the sun 
B) electron flow through a wire generates heat 
C) a charged particle in a magnetic field moves in a circular orbit 
D) heat can be generated by rubbing two sticks together 
E) the Doppler effect 
A) the tail of a comet points away from the sun 
B) electron flow through a wire generates heat 
C) a charged particle in a magnetic field moves in a circular orbit 
D) heat can be generated by rubbing two sticks together 
E) the Doppler effect

Question 19

The time averaged energy in a sinusoidal electromagnetic wave is:

Accepted Answer

A) overwhelmingly electrical 
B) slightly more electrical than magnetic 
C) equally divided between the electric and magnetic fields 
D) slightly more magnetic than electrical 
E) overwhelmingly magnetic 
A) overwhelmingly electrical 
B) slightly more electrical than magnetic 
C) equally divided between the electric and magnetic fields 
D) slightly more magnetic than electrical 
E) overwhelmingly magnetic

Question 20

Maxwell's equations predict that the speed of light in free space is:

Accepted Answer

A) an increasing function of frequency 
B) a decreasing function of frequency 
C) independent of frequency 
D) a function of the distance from the source 
E) a function of the size of the source 
A) an increasing function of frequency 
B) a decreasing function of frequency 
C) independent of frequency 
D) a function of the distance from the source 
E) a function of the size of the source

Exam 33: Electromagnetic Waves

A ray of light passes obliquely through a plate of glass having parallel faces.The emerging ray:

The units of index of refraction are:

For an electromagnetic wave the direction of the vector gives:

For a beam of light in air (n = 1)reflecting off glass (n = 1.5), what is Brewster's angle?

Radio waves of wavelength 300 m have a frequency of:

An electromagnetic wave is generated by:

When the distance between a point source of light and a light meter is reduced from 6.0 m to 2.0 m, the intensity of illumination at the meter will be the original value multiplied by:

The index of refraction of benzene is 1.80.The critical angle for total internal reflection, at a benzene-air interface, is about:

The relation θ\thetaθ incident = θ\thetaθ reflected, which applies as a ray of light strikes an interface between two media, is known as:

The dimensions of are:

If the amplitude of the electric field in a plane electromagnetic wave is 100 V/m then the amplitude of the magnetic field is:

A clear sheet of polarizing material is placed on top of a second, similar sheet so that their polarizing axes make an angle of 30 °\degree° with each other.The ratio of the intensity of emerging light to incident unpolarized light is:

Which of the following types of electromagnetic radiation travels at the greatest speed in vacuum?

The rectangular metal tank shown is filled with an unknown liquid.The observer, whose eye is level with the top of the tank, can just see corner E.The index of refraction of this liquid is:

The product µ0ε0 has the same units as:

Light with an intensity of 1 kW/m2 falls normally on a surface and is completely absorbed.The radiation pressure is:

Evidence that electromagnetic waves carry momentum is:

The time averaged energy in a sinusoidal electromagnetic wave is:

Maxwell's equations predict that the speed of light in free space is:

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The relation $\theta$ _incident = $\theta$ _reflected, which applies as a ray of light strikes an interface between two media, is known as:

A clear sheet of polarizing material is placed on top of a second, similar sheet so that their polarizing axes make an angle of 30 $\degree$ with each other.The ratio of the intensity of emerging light to incident unpolarized light is:

The product µ₀ε₀ has the same units as:

Light with an intensity of 1 kW/m² falls normally on a surface and is completely absorbed.The radiation pressure is: