# LECTURE 5, SEPTEMBER 7, 2010 ASTR 101, SECTION 3 INSTRUCTOR, JACK BRANDT 1ASTR 101-3, FALL 2010.

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LECTURE 5, SEPTEMBER 7, 2010 ASTR 101, SECTION 3 INSTRUCTOR, JACK BRANDT jcbrandt@unm.edu 1ASTR 101-3, FALL 2010

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a) wavelength b) frequency c) period d) amplitude e) energy The distance between successive wave crests defines the ________ of a wave. Question 2

a) wavelength b) frequency c) period d) amplitude e) energy The distance between successive wave crests defines the ________ of a wave. Question 2 Light can range from short-wavelength gamma rays to long- wavelength radio waves.

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a) gamma rays b) infrared c) sound d) visible light e) radio Which of these is NOT a form of electromagnetic radiation? Question 1

a) gamma rays b) infrared c) sound d) visible light e) radio Which of these is NOT a form of electromagnetic radiation? Question 1 Sound comes from pressure waves; all others are types of EM radiation of different wavelengths.

Question 8 What types of electro-magnetic radiation from space reach the surface of Earth? a) radio & microwaves b) X rays & ultraviolet light c) infrared & gamma rays d) visible light & radio waves e) visible & ultraviolet light

Question 8 What types of electro-magnetic radiation from space reach the surface of Earth? a) radio & microwaves b) X rays & ultraviolet light c) infrared & gamma rays d) visible light & radio waves e) visible & ultraviolet light Earth’s atmosphere allows radio waves and visible light to reach the ground.

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a) radius. b) mass. c) magnetic field. d) temperature. e) direction of motion. The frequency at which a star’s intensity is greatest depends directly on its Question 3

a) radius. b) mass. c) magnetic field. d) temperature. e) direction of motion. The frequency at which a star’s intensity is greatest depends directly on its Question 3 Wien’s Law means that hotter stars produce much more high- frequency light.

Question 4 a) cooler than b) the same temperature as c) older than d) hotter than e) more massive than The constellation ORION Rigel appears as a bright bluish star, whereas Betelgeuse appears as a bright reddish star. Rigel is ______ Betelgeuse. Betelgeuse Rigel

Question 4 Rigel appears as a bright bluish star, whereas Betelgeuse appears as a bright reddish star. Rigel is ______ Betelgeuse. The constellation ORION Betelgeuse Rigel a) cooler than b) the same temperature as c) older than d) hotter than e) more massive than Hotter stars look bluer in color; cooler stars look redder.

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