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Exam 3: Radiation: Information From the Cosmos

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Question 21

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The number of waves passing the observer per second is:

A) the wavelength in angstroms.
B) the amplitude in nm.
C) the frequency in Hertz.
D) the period in seconds.
E) the energy in milliwatts.

F) D) and E)
G) A) and D)

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Question 22

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What is white light? Why do we perceive different colors with a prism?

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White light is composed of all the color...

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Question 23

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A star whose temperature is 8000 K has a peak wavelength of 362.5 nm, according to Wien'sLaw. If the star is in the Andromeda Galaxy, which is moving towards us at about 402,000km/hour, what would an observer on Earth see as the peak wavelength for this star (show yourwork, and use c = 300,000 km/s)?

Why would a hotter star appear blue-white while a cooler star appear red or not be visible atall?

Wave energy can only be transmitted through a material medium.

Describe the relationship between frequency and wavelength.

If a light source is approaching you at a speed very close to the speed of light, it will appear:

If a new wave arrives on shore every two seconds, then its frequency is 2 Hz.

At which of these Kelvin temperatures would a blackbody radiate mostly at visiblewavelengths?

To see the Sun's hot corona (a temperature of 1,000,000 K) , which part of theelectromagnetic spectrum should one observe?

The wavelength at which a blackbody radiates most depends on its:

Radio waves travel at the speed of sound; X-rays travel at the speed of light.

How can Wien's law be used to determine the temperature of a star?

As a star's temperature increases, the frequency of peak emission also increases.

What do infrared and ultraviolet waves have in common? How do they differ?

Electromagnetic radiation with a wavelength of 700 nm would be:

Per unit area (such as a square centimeter) , a B star whose surface temperature is 10,000 Kwill put out how much radiation compared to an O star whose surface temperature is 30,000 K?

A cool star like Antares would produce more ________ than visible light.

The Doppler Effect is a phenomenon that allows one to measure an object's:

Why can't we be certain that the Andromeda Galaxy exists today?