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Exam 25: Electromagnetic Waves

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Question 21

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The average intensity of the sunlight in Miami, Florida, is 1040 W/m². What is the average value of the radiation pressure due to this sunlight in Miami?

A) 2.28 × 10^-6 N/m²
B) 1.63 × 10^-6 N/m²
C) 7.83 × 10^-6 N
D) 3.46 × 10^-6 N/m²
E) 9.78 × 10^-6 N/m²

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Question 22

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A radio station broadcasts at 80 MHz. How long does it take for this radio signal to travel a distance of 20 × 10⁶ m?

A) 0.15 × 10^-2 s
B) 15 ms
C) 6.7 × 10^-2 s
D) 20 ms
E) 25 ms

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Question 23

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A car is going past a radio station at a speed of 40.0 m/s. If the radio station broadcasts at a frequency of 74.5 MHz, what change in frequency does the driver observe?

The maximum value of the magnetic field component of an electromagnetic wave is 2.81 μT. What is the rms value of the magnetic field?

An electromagnetic wave is propagating towards the west. At a certain moment the direction of the magnetic field vector associated with this wave points vertically up. What is the direction of the electric field vector?

The electric energy density in an electromagnetic wave is higher than its magnetic energy density.

A 60.0 W light bulb radiates light uniformly in all different directions. What is the value of E at a distance of 0.400 m from the bulb?

The total electromagnetic power emitted by the Sun is 3.8 ×10²⁶ W. What is the radiation pressure near the orbit of Mercury, which has an orbital radius of 5.8 × 10¹⁰ m?

In Fizeau's experiment to measure the speed of light, the wheel has 475 notches and rotates with a speed of 40.0 rev/sec. Light passing through one notch travels to the mirror and back just in time to pass through the next notch. If the distance between the wheel and the mirror is 7890 m, what is the speed of light measured by this experiment?

The speed of electromagnetic waves through a vacuum is ten times the speed of sound in air.

An 8.000-mW laser beam emits a cylindrical beam of light 0.6000 mm in diameter. What is the maximum value of the magnetic field?

How far does a beam of light travel in one full year?

The Doppler effect applies to sound waves but not to electromagnetic waves.

A laser beam takes 24 ms to be reflected from the surface of a planet. How far from the laser source is this planet's surface?

The wavelength of a certain portion of microwaves is 40 mm. What is its frequency?

In an electromagnetic wave the and fields are oriented such that

A car is approaching a radio station at a speed of 25.0 m/s. If the radio station broadcasts at a frequency of 74.5 MHz, what change in frequency does the driver observe?

Unpolarized light of intensity I_o passed through a Polaroid sheet with its polarizing axis at the 12 o'clock position and then through a second with its polarizing axis at the 1 o'clock position. What is the intensity of the emerging light?

Which of the following represents the maximum value of the magnetic field at a distance of 2.5 m from a 100 W light bulb?

Electromagnetic waves are a result of a stationary electric field and a changing magnetic field.