1a) Which of these statements below is correct? 1b) When James Clerk Maxwell fou

Question

1a) Which of these statements below is correct?

1b) When James Clerk Maxwell found that the equations of electromagnetism predicted wave behavior, he concluded that light was an electromagnetic wave because

1c) Light from a source that emits light in all directions has an intensity I at a distance R. At twice the distance, the intensity would be:

1d) The polarization of a wave is defined by the:

1e) Which of these is NOT a property of a photon?

1f) You are comparing two electromagnetic waves. You measure the maximum E field of one of them to be twice as large as the E field of another one. You can conclude that this wave (with twice the maximum E field), compared to the other wave, has:

1g) In a plane electromagnetic wave, the E and B fields are:

1h)You go to a 3D movie with a friend. While you are waiting for the movie, you borrow your friend's 3D glasses and hold them up in front of yours (but perpendicular - so one pair is horizontal and one pair is vertical). Since the 3D glasses use polarizers, you find that:

1i) As an incandescent (glowing due to thermal radiation) object's temperature increases:

1a) Which of these statements below is correct?

A) A changing electric field creates a magnetic field, but a changing electric field does not create a magnetic field
B) A changing electric field does not create a magnetic field, but a changing electric field creates a magnetic field
C) A changing electric field creates a magnetic field and a changing electric field creates a magnetic field
D) One type of field cannot create another type of field

1b) When James Clerk Maxwell found that the equations of electromagnetism predicted wave behavior, he concluded that light was an electromagnetic wave because

A) he experimentally measured the E and B fields of a light ray
B) the speed of these EM waves would be the same as the speed of light
C) light was already known to be a wave of some kind
D) he experimentally measured the wavelength and frequency of an EM wave and saw they were the same as that of a light ray

1c) Light from a source that emits light in all directions has an intensity I at a distance R. At twice the distance, the intensity would be:

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

1d) The polarization of a wave is defined by the:

A) the direction of the E field and direction of motion
B) the direction of the E field and direction of the B field
C) the direction of the B field and direction of motion

1e) Which of these is NOT a property of a photon?

A) It has a particle-like nature
B) It has an energy proportional to its frequency
C) It travels faster than the speed of light
D) A large number of photons combine to behave as a wave

1f) You are comparing two electromagnetic waves. You measure the maximum E field of one of them to be twice as large as the E field of another one. You can conclude that this wave (with twice the maximum E field), compared to the other wave, has:

A) twice the B field, and is traveling at twice the speed
B) the same B field, but is traveling at twice the speed
C) twice the B field, but is traveling at the same speed
D) half the B field, traveling at twice the speed
E) half the B field, traveling at the same speed

1g) In a plane electromagnetic wave, the E and B fields are:

A) parallel and in phase
B) perpendicular and in phase
C) parallel and 90 degrees out of phase
D) perpendicular and 90 degrees out of phase
E) parallel, can be any phase relative to one another
F) perpendicular, can be any phase relative to one another

1h)You go to a 3D movie with a friend. While you are waiting for the movie, you borrow your friend's 3D glasses and hold them up in front of yours (but perpendicular - so one pair is horizontal and one pair is vertical). Since the 3D glasses use polarizers, you find that:

A) you see a somewhat dimmed light
B) you see the full light intensity you would have without the glasses
C) you see more light than you would without the glasses
D) you see the light completed blocked

1i) As an incandescent (glowing due to thermal radiation) object's temperature increases:

A) it puts out less thermal radiation and its color shifts towards the blue end of the spectrum
B) it puts out less thermal radiation and its color shifts towards the red end of the spectrum
C) it puts out more thermal radiation and its color shifts towards the red end of the spectrum
D) it puts out more thermal radiation and its color shifts towards the blue end of the spectrum

Explanation / Answer

1a. C) A changing electric field creates a magnetic field and a changing electric field creates a magnetic field

1b.
B) the speed of these EM waves would be the same as the speed of light

1c. As Io = P/area , at twice the radius , I = P/4pi(2r)^2 = I0/4

1c. option C

d. A) the direction of the E field and direction of motion

e. C) It travels faster than the speed of light

f. relation Between E and B is E = Bc

where c is speed of light

so Doublng E,

so

f option are : C) twice the B field, but is traveling at the same speed

g. B) perpendicular and in phase

h. D) you see the light completed blocked

i.
C) it puts out more thermal radiation and its color shifts towards the red end of the spectrum

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