Ch 31

Which of the following statements are true? Check all that apply. A)Electromagnetic waves transport linear momentum. B)Electromagnetic waves can exert pressure on an object. C)Electromagnetic waves transport mass from one region of space to another. D)Electromagnetic waves transport energy from one region of space to another.

Which of the following statements are true? Check all that apply. A)Time-varying electric and magnetic fields can propagate through space only if there is no matter in their path. B)A time-varying magnetic field will produce an electric field. C)Electric and magnetic fields can be treated independently only if they vary in time. E)A time-varying electric field will produce a magnetic field.

Which of the following statements are true concerning electromagnetic radiation fields? Check all that apply. A)The electric and magnetic fields are in phase with each other as they propagate through space. B)The electric field at any point is perpendicular to the direction of wave travel. C)The magnetic field at any point is perpendicular to the direction of wave travel. D)The electric and magnetic fields at any point are parallel to each other. E)The electric and magnetic fields are phase-shifted 180° with respect to each other as they propagate through space.

Which of the following statements are true concerning electromagnetic waves in a vacuum? Check all that apply. A)Electromagnetic waves can travel in a vacuum only because a medium prohibits the forward propagation of the electric and magnetic fields. B)Electromagnetic waves travel in a vacuum with a definite and unchanging speed. C)When electromagnetic waves travel in a vacuum, there is a definite, constant ratio between the magnitudes of the electric and magnetic fields. D)Electromagnetic waves traveling in a vacuum are longitudinal waves.

What is the velocity of all electromagnetic waves in a vacuum? A)The velocity of electromagnetic waves is nearly equal to 3 × 10⁸ m/s. B)The velocity of electromagnetic waves depends upon their amplitude. C)The velocity of electromagnetic waves depends upon their frequency. D)The velocity of electromagnetic waves depends upon their wavelength. E)Electromagnetic waves do not propagate forward; hence, their velocity is zero.

Suppose that an electromagnetic wave is traveling toward the east. At one instant at a given point, the electric field vector points upward. What is the direction of the magnetic field at this same given point and instant in time? A)south B)upward C)downward D)north E)west F)east

Which of the following are found within the electromagnetic spectrum? Check all that apply. A)ultraviolet radiation B)X rays C)visible light D)gamma rays E)sound waves F)microwave radiation

Which of the following statements are true regarding the electromagnetic spectrum? Check all that apply. A)X rays and gamma rays have very long wavelengths and very low photon energies. B)Infrared radiation has long wavelengths and low photon energies. C)Ultraviolet radiation has long wavelengths and low photon energies. D)Radio waves have wavelengths on the order of meters and very low photon energies. E)Visible light lies at the center of the electromagnetic spectrum.

Consider the electromagnetic field produced at a given distance from a light source. Which of the following statements are true? Check all that apply. A)The intensity of the wave is proportional to the square of the fields. B)The intensity of the wave is inversely proportional to the speed of light. C)The intensity of the wave is inversely proportional to the square of the fields. D)The intensity of the wave is proportional to the speed of light.

Rank electromagnetic waves on the basis of their speed (in vacuum). Green Light, Infrared Light, FM Radio Wave, AM Radio Wave, X Ray, Yellow Light.

Rank these electromagnetic waves on the basis of their wavelength. Green Light, Infrared Light, FM Radio Wave, AM Radio Wave, X-Ray, Yellow Light.

Rank these electromagnetic waves on the basis of their frequency. Green Light, Infrared Light, FM Radio Wave, AM Radio Wave, X Ray, Yellow Light.

The electric and magnetic field vectors at a specific point in space and time of an electromagnetic wave are illustrated in (Figure). Based on this information, in what direction does the electromagnetic wave propagate? A)+x B)-x C)+y D)-y E)+z F)-z G)at a +45∘ angle in the xy plane

The electric and magnetic field vectors at a specific point in space and time are illustrated. (Figure ) (E⃗ and B⃗ are in the xy plane. Both vectors make 45∘ angles with the + y axis.) Based on this information, in what direction does the electromagnetic wave propagate? A)+x B)-x C)+y D)-y E)+z F)-z G)at a +45∘ angle in the xy plane

The magnetic field vector and the direction of propagation of an electromagnetic wave are illustrated. (Figure ) Based on this information, in what direction does the electric field vector point? A)+x B)-x C)+y D)-y E)+z F)-z G)at a +45∘ angle in the xz-plane

The electric field vector and the direction of propagation of an electromagnetic wave are illustrated. (Figure) (E⃗ is in xz plane and makes a 45∘ angle with the + x axis.) Based on this information, in what direction does the magnetic field vector point? A)+x B)-x C)+y D)-y E)+z F)-z G)at a +45∘ angle in the xz-plane