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Describe the relationship between frequency and wavelength.

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The higher the frequ...

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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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Wave energy can only be transmitted through a material medium.

A) True
B) False

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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)?

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The Doppler Effect says that the apparen...

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


A) temperature.
B) radius.
C) radial motion.
D) tangential motion.
E) chemical composition.

F) C) and D)
G) B) and D)

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

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Both are forms of electromagnetic radiat...

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


A) the visible
B) the X-ray
C) the ultraviolet
D) the radio
E) the infrared

F) None of the above
G) A) and D)

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

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Stefan's law notes that the higher the t...

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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) None of the above
G) C) and D)

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


A) radius.
B) mass.
C) magnetic fields.
D) temperature.
E) direction of motion.

F) C) and E)
G) B) and E)

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


A) redder than it is.
B) bluer than it is.
C) brighter than it is.
D) fainter than it is.
E) lower temperature than it is.

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

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

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Since it lies 2.5 million ligh...

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

A) True
B) False

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

A) True
B) False

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Electromagnetic radiation with a wavelength of 700 nm would be:


A) X-rays.
B) red light.
C) violet light.
D) ultraviolet light.
E) microwaves.

F) B) and D)
G) A) and D)

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


A) 6 K
B) 60 K
C) 600 K
D) 6000 K
E) None of these; a blackbody doesn't radiate visible light.

F) D) and E)
G) B) and D)

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

A) True
B) False

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

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

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Careful analysis of the blackbody curve ...

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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) 81 times as much
B) 9 times as much
C) 1/811 / 81 1 s much
D) 1/91 / 9 s much
E) 1/31 / 3 3 s much

F) A) and E)
G) B) and C)

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Showing 21 - 40 of 113

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