Exam 3: Radiation: Information From the Cosmos

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)?

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.

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

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 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.

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

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

Describe the relationship between frequency and wavelength.

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

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?

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

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

Electromagnetic radiation with a wavelength of 700 nm would be:

The number of waves passing the observer per second is:

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

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

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