Earth is about 28,000 light years from the center of the Milky Way Galaxy.If a supernova explosion occurred approximately 14,000 light years away from us and released 2.0 $\times$ 1046 J of energy in a sudden burst of light,how much energy would enter one of your pupils? Assume the diameter of a pupil to be about 4 mm.(For comparison,our Sun radiates approximately 4 $\times$ 1026 J/s.)

A) 1.1 J B) 3.0 $\times$ 1023 J C) 3.5 J D) 4.6 J E) 2.2 J A) 1.1 J B) 3.0 $\times$ 1023 J C) 3.5 J D) 4.6 J E) 2.2 J A

The electric field of an electro-magnetic wave is given by Ey = 25 sin(2.4 $\times$ 106 $\pi$ (x - 3.0 $\times$ 108t)).What is the frequency of the wave?

A) 4.8 $\times$ 107 s-1 B) 3.6 $\times$ 1014 s-1 C) 1.2 $\times$ 106 s-1 D) 2.3 $\times$ 1015 s-1 E) none of the above A) 4.8 $\times$ 107 s-1 B) 3.6 $\times$ 1014 s-1 C) 1.2 $\times$ 106 s-1 D) 2.3 $\times$ 1015 s-1 E) none of the above

Exam 30: Maxwells Equations and Electromagnetic Waves

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Earth is about 28,000 light years from the center of the Milky Way Galaxy.If a supernova explosion occurred approximately 14,000 light years away from us and released 2.0 $\times$ 10⁴⁶ J of energy in a sudden burst of light,how much energy would enter one of your pupils? Assume the diameter of a pupil to be about 4 mm.(For comparison,our Sun radiates approximately 4 $\times$ 10²⁶ J/s.)

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Which of the following groups is arranged in order of increasing wavelength?

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The electric field in a region of space varies according to where t is in seconds.The maximum displacement current through a 1.00-m² area perpendicular to E is approximately

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Charge is flowing onto one plate of a parallel-plate capacitor and off the other plate at a rate of 5.00 A.The rate at which the electric field between the plates is changing is approximately

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Question 4

Charge is flowing onto one plate of a parallel-plate capacitor and off the other plate at a rate of 2.50 A.The rate at which the electric field between the plates is changing is approximately

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Question 5

If the existence of magnetic monopoles should ever be confirmed,which of the following equations would have to be altered?

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Question 6

Which of the following does not result in the production of electromagnetic waves?

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Question 7

An astronaut is stranded in space a distance of 50 m from her spaceship.She carries a 5-kW laser gun.If the total mass of the astronaut,space suit,and laser gun is 90 kg,approximately how long will it take her to reach her ship if she points the laser gun directly away from it?

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Question 8

A 60-W light bulb emits spherical electromagnetic waves uniformly in all directions.If 50% of the power input to such a light bulb is emitted as electromagnetic radiation,what is the radiation intensity at a distance of 2.00 m from the light bulb?

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Question 9

An electromagnetic wave of intensity 100 W/m² is incident normally on a square white card whose sides are 25 cm.If the card reflects all of the radiation incident on it,the approximate force exerted by the wave on this card is

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Question 10

The intensity of a laser beam is 450 W/m².What is the rms value of the electric field of this laser beam? (The permittivity of free space $\varepsilon$ ₀ = 8.85 $\times$ 10^-12 C²/N · m² and the permeability of free space µ₀ = 4 $\pi$ $\times$ 10^-7 N/A².)

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Question 11

The visible portion of the electromagnetic spectrum is closest to which of the following intervals?

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Question 12

How long does it take light to travel across the width of a Pb nucleus of radius 7.1 fm?

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Question 13

The electric field of an electro-magnetic wave is given by E_y = 25 sin(2.4 $\times$ 10⁶ $\pi$ (x - 3.0 $\times$ 10⁸t)).What is the frequency of the wave?

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Question 14

Which of the following functions satisfy the one-dimensional wave equation?

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Question 15

An electromagnetic wave of intensity 100 W/m² is incident normally on a square black card whose sides are 25 cm.If the card absorbs all of the radiation incident on it,the approximate force exerted by the wave on this card is

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Question 16

Electromagnetic waves are produced when

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Question 17

The detection of radio waves can be accomplished with either a dipole antenna or a loop antenna.The dipole antenna detects the _ of the wave,and the loop antenna detects the _ field of the wave.

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Question 18

A parallel-plate capacitor has closely spaced circular plates of radius R = 2.00 cm.Charge is flowing onto the positive plate at the rate I = dQ/dt = 1.36 A.The magnetic field at a distance r = 2.00 cm from the axis of the plates is approximately

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Question 19

The nearest star to us,Alpha Centauri,is 4.30 light-years away.What is this distance in kilometers?

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Question 20

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Exam 30: Maxwells Equations and Electromagnetic Waves

Which of the following groups is arranged in order of increasing wavelength?

The electric field in a region of space varies according to where t is in seconds.The maximum displacement current through a 1.00-m2 area perpendicular to E is approximately

Charge is flowing onto one plate of a parallel-plate capacitor and off the other plate at a rate of 5.00 A.The rate at which the electric field between the plates is changing is approximately

Charge is flowing onto one plate of a parallel-plate capacitor and off the other plate at a rate of 2.50 A.The rate at which the electric field between the plates is changing is approximately

If the existence of magnetic monopoles should ever be confirmed,which of the following equations would have to be altered?

Which of the following does not result in the production of electromagnetic waves?

An astronaut is stranded in space a distance of 50 m from her spaceship.She carries a 5-kW laser gun.If the total mass of the astronaut,space suit,and laser gun is 90 kg,approximately how long will it take her to reach her ship if she points the laser gun directly away from it?

A 60-W light bulb emits spherical electromagnetic waves uniformly in all directions.If 50% of the power input to such a light bulb is emitted as electromagnetic radiation,what is the radiation intensity at a distance of 2.00 m from the light bulb?

An electromagnetic wave of intensity 100 W/m2 is incident normally on a square white card whose sides are 25 cm.If the card reflects all of the radiation incident on it,the approximate force exerted by the wave on this card is

The intensity of a laser beam is 450 W/m2.What is the rms value of the electric field of this laser beam? (The permittivity of free space ε\varepsilonε 0 = 8.85 ×\times× 10-12 C2/N · m2 and the permeability of free space µ0 = 4 π\piπ ×\times× 10-7 N/A2.)

The visible portion of the electromagnetic spectrum is closest to which of the following intervals?

How long does it take light to travel across the width of a Pb nucleus of radius 7.1 fm?

The electric field of an electro-magnetic wave is given by Ey = 25 sin(2.4 ×\times× 106 π\piπ (x - 3.0 ×\times× 108t)).What is the frequency of the wave?

Which of the following functions satisfy the one-dimensional wave equation?

An electromagnetic wave of intensity 100 W/m2 is incident normally on a square black card whose sides are 25 cm.If the card absorbs all of the radiation incident on it,the approximate force exerted by the wave on this card is

Electromagnetic waves are produced when

The detection of radio waves can be accomplished with either a dipole antenna or a loop antenna.The dipole antenna detects the _____ of the wave,and the loop antenna detects the _____ field of the wave.

A parallel-plate capacitor has closely spaced circular plates of radius R = 2.00 cm.Charge is flowing onto the positive plate at the rate I = dQ/dt = 1.36 A.The magnetic field at a distance r = 2.00 cm from the axis of the plates is approximately

The nearest star to us,Alpha Centauri,is 4.30 light-years away.What is this distance in kilometers?

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The electric field in a region of space varies according to where t is in seconds.The maximum displacement current through a 1.00-m² area perpendicular to E is approximately

An electromagnetic wave of intensity 100 W/m² is incident normally on a square white card whose sides are 25 cm.If the card reflects all of the radiation incident on it,the approximate force exerted by the wave on this card is

The intensity of a laser beam is 450 W/m².What is the rms value of the electric field of this laser beam? (The permittivity of free space $\varepsilon$ ₀ = 8.85 $\times$ 10^-12 C²/N · m² and the permeability of free space µ₀ = 4 $\pi$ $\times$ 10^-7 N/A².)

The electric field of an electro-magnetic wave is given by E_y = 25 sin(2.4 $\times$ 10⁶ $\pi$ (x - 3.0 $\times$ 10⁸t)).What is the frequency of the wave?

An electromagnetic wave of intensity 100 W/m² is incident normally on a square black card whose sides are 25 cm.If the card absorbs all of the radiation incident on it,the approximate force exerted by the wave on this card is

The detection of radio waves can be accomplished with either a dipole antenna or a loop antenna.The dipole antenna detects the _ of the wave,and the loop antenna detects the _ field of the wave.