ASTRO 1010 Final

Which of the following statements about electromagnetic radiation is FALSE?

• different waves of electromagnetic radiation differ in their wavelength or frequency

• it is typically produced when charged particles oscillate

• it always spreads out at the speed of light

• it is given off by all objects that are not at a temperature of absolute zero

• the radiation consists of tiny charged particles given off by the nuclei of atoms

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How fast do electromagnetic waves travel?

• at the speed of sound

• at different speeds, depending on the temperature of the atoms that produce them

• they always have zero speed

• at the speed of charge

• at the speed of light

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This chapter discusses that light sometimes acts like a photon. What is a photon?

• a self-contained “packet” of electro-magnetic energy

• a kind of magnetic substance found in reflective minerals

• you can’t fool me. Einstein showed that photons were a mistake – they don’t exist.

• a kind of sound that is too high frequency for the human ear to hear

• a charged particle in the nucleus of every atom

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In the future, several students living on board a space station decide to have a race among different types of electromagnetic radiation. Which of the following travels through space the fastest? (consider space as a perfect vacuum)

• x-rays

• you can't fool me, all of these travel through space at the same speed

• radio waves

• infrared

• visible light

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Which of the following has the longest wavelength?

• ultraviolet waves

• x-rays

• radio waves

• visible light waves

• you can't fool me, all these have the same wavelength

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What is the chief factor that determines what type of electromagnetic radiation objects give off?

• size

• temperature

• distance from the Earth's core

• mass

• composition

Which of the following has the greatest average energy of random atomic and molecular motion?

• a cube of ice

• a cube of steam

• a cube of the Sun

• a cube of air (on Earth)

• a cube of water

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An astronomer discovers a new star and wants to measure its temperature. She would typically do this by:

• making a blackbody curve and finding the wavelength of the peak (maximum)

• measuring the intensity of radio waves the star gives off

• measuring how much light the star reflects

• sending a graduate student with a very long (and durable) thermometer to the star's vicinity

• measuring the Doppler shift of its spectral lines

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Wien's Law relates the wavelength at which a star gives off the greatest amount of energy to the star's

• temperature

• overall color

• motion toward us or away from us

• magnetic field

• none of the above

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Why is an absorption spectrum especially useful for astronomers?

• It has dark lines in it that allow astronomers to determine what elements are in the star

• It helped astronomers to understand the rainbows we see on Earth after storms

• An absorption spectrum is not useful to astronomers at all. When they see one, it means they cannot learn anything about the stars that produced the annoying absorption.

• It has bright lines in it which allow astronomers to determine how bright the star is

• It shows that the stars are transparent; we can see right through them

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