Quiz7b - Exam Phys 2C, Quiz 7 Name_ MULTIPLE CHOICE. Choose...

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Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Which of the following is a WRONG statement? A) In a plane electromagnetic wave in vacuum, the magnetic fields is always perpendicular to the electric field and to the direction of wave propagation. B) For optimal reception of AM radio waves, the antenna of the receiver should be parallel to the antenna of the transmitter. C) In a given point in space, the electric and magnetic field of a plane electromagnetic wave in vacuum reach their maximal absolute values simultaneously. D) These electromagnetic waves are listed in the order of increasing wave length: gamma rays, X - rays, ultraviolet light, infrared light, microwaves, FM radio, AM radio. E) The radiation of an antenna emitting AM waves is directed such that the intensity of emitted waves is maximal in the direction along the antenna. 2) Which of the following is a WRONG statement: A) When unpolarized light passes through a polarizer, the intensity of transmitted light does not depend on the orientation of the transmission axis of the polarizer. B) For a given horisonal laser beam incident upon a mirror, rotation of the mirror by 1 ° around a vertical axis changes the direction of the beam reflected from the mirror by 2°. C) For a given light beam in air normally incident upon flat interfaces with water and glass, the intensity of a beam reflected from water (index of refraction 1.33) is lower than from glass (index of refraction 1.51). D) For a light beam in air, the value of the Brewster (polarizing) angle at an air - water interface is greater than at an air - glass interface. E) The opening angle of the Mach cone in a shock wave in air decreases as the speed of the object generating the wave increases. 3) Which of the following is a WRONG statement? A) When light travels from air into water, its wavelength decreases. B) The presence of cladding around the core of an optical fiber increases the critical angle as compared with the case when the core is surrounded by air. C) Higher index of refraction of glass for violet light as compared with red light means that violet light travels through glass faster. D) If you scratch the outside of the reflecting surface of a prism used for total internal reflection, light is likely to start leaking through the scratch. E) When a beam of light coming from a medium with a lower index of refraction enters a medium with a higher index of refraction, the beam bends towards the normal to the interface between the two media. 4) At a certain speed of an aircraft, the Mach angle (one half of the opening angle of the cone) is 70 °. What is the Mach angle if the speed of the aircraft is doubled? A) 28°
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Quiz7b - Exam Phys 2C, Quiz 7 Name_ MULTIPLE CHOICE. Choose...

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