A minivan moving at 38 m/s passes an unmarked state police car moving at 24 m/s. The electromagnetic waves produced by the radar gun in the police car have a frequency of 8.25 × 109 Hz. What is the magnitude of the difference in frequency between the waves emitted by the gun and those that are reflected back from the speeding minivan?

A) 180 Hz B) 390 Hz C) 770 Hz D) 1440 Hz E) 2100 Hz A) 180 Hz B) 390 Hz C) 770 Hz D) 1440 Hz E) 2100 Hz

An incandescent light bulb radiates uniformly in all directions with a total average power of 1.0 × 102 W. What is the maximum value of the magnetic field at a distance of 0.50 m from the bulb?

A) 8.4 × 10-7 T B) 5.2 × 10-7 T C) 3.1 × 10-7 T D) 1.6 × 10-7 T E) zero tesla A) 8.4 × 10-7 T B) 5.2 × 10-7 T C) 3.1 × 10-7 T D) 1.6 × 10-7 T E) zero tesla

Exam 24: Electromagnetic Waves

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The figure shows the time variation of the magnitude of the electric field of an electromagnetic wave produced by a wire antenna. -What is the average intensity of this electromagnetic wave?

(Multiple Choice)

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Question 61

A minivan moving at 38 m/s passes an unmarked state police car moving at 24 m/s. The electromagnetic waves produced by the radar gun in the police car have a frequency of 8.25 × 10⁹ Hz. What is the magnitude of the difference in frequency between the waves emitted by the gun and those that are reflected back from the speeding minivan?

(Multiple Choice)

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Question 62

An FM radio station generates radio waves that have a frequency of 101.3 MHz. The frequency of the waves from a competing station have a frequency of 107.1 MHz. What is the difference in wavelength between the waves emitted from the two stations?

(Multiple Choice)

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Question 63

Two polarizing sheets have their transmission axes parallel so that the intensity of unpolarized light transmitted through both of them is a maximum. Through what angle must either sheet be rotated if the transmitted intensity is 25 % of the incident intensity?

(Multiple Choice)

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Question 64

An incandescent light bulb radiates uniformly in all directions with a total average power of 1.0 × 10² W. What is the maximum value of the magnetic field at a distance of 0.50 m from the bulb?

(Multiple Choice)

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Question 65

A linearly polarized electromagnetic wave is sent through two sheets of polarizing material. The first sheet, A, is oriented so that its transmission axis makes an angle of 30° with respect to the incident electric field of the wave. The second sheet, B, is oriented so that its transmission axis makes an angle of 90° with the incident electric field of the wave. The incident beam has an electric field of peak magnitude E₀ and average intensity S₀. -What is the average intensity of the wave after it passes through A?

(Multiple Choice)

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Question 66

Showing 61 - 66 of 66

The figure shows the time variation of the magnitude of the electric field of an electromagnetic wave produced by a wire antenna. -What is the average intensity of this electromagnetic wave?

An FM radio station generates radio waves that have a frequency of 101.3 MHz. The frequency of the waves from a competing station have a frequency of 107.1 MHz. What is the difference in wavelength between the waves emitted from the two stations?

Two polarizing sheets have their transmission axes parallel so that the intensity of unpolarized light transmitted through both of them is a maximum. Through what angle must either sheet be rotated if the transmitted intensity is 25 % of the incident intensity?

An incandescent light bulb radiates uniformly in all directions with a total average power of 1.0 × 10² W. What is the maximum value of the magnetic field at a distance of 0.50 m from the bulb?

Introduction and Mathematical Concepts

Kinematics in One Dimension

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Forces and Newtons Laws of Motion

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Work and Energy

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Rotational Kinematics

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Simple Harmonic Motion and Elasticity

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The Transfer of Heat

The Ideal Gas Law and Kinetic Theory

Thermodynamics

Waves and Sound

The Principle of Linear Superposition and Interference Phenomena

Electric Forces and Electric Fields

Electric Potential Energy and the Electric Potential

Electric Circuits

Magnetic Forces and Magnetic Fields

Electromagnetic Induction

Alternating Current Circuits

The Refl Ection of Light: Mirrors

The Refraction of Light: Lenses and Optical Instruments

Interference and the Wave Nature of Light

Special Relativity

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Ionizing Radiation, Nuclear Energy, and Elementary Particles

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