lecture 5, september 7, 2010 astr 101, section 3 instructor, jack brandt jcbrandt@unm.edu 1astr...

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LECTURE 5, SEPTEMBER 7, 2010

ASTR 101, SECTION 3INSTRUCTOR, JACK BRANDT

jcbrandt@unm.edu

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a) wavelengthb) frequencyc) periodd) amplitudee) energy

The distance between successive wave crests defines the ________ of a wave.

Question 2

a) wavelengthb) frequencyc) periodd) amplitudee) 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 raysb) infraredc) soundd) visible lighte) radio

Which of these is NOT a form of electromagnetic radiation?

Question 1

a) gamma raysb) infraredc) soundd) visible lighte) 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 raysd) visible light & radio wavese) 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 raysd) visible light & radio wavese) 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.