Astronomy homework #4 chapter 5

Why don't we see cars as bluer when they approach and redder when they recede?

They are too slow

In order for an electron to jump up two energy levels in an atom at once, it requires

a. a precise amount of energy b. a bluer photon than to jump up one energy level c. more energy than to jump up one energy level

As a blackbody becomes hotter, it also becomes __________ and __________.

as the temperature of an object increases, the object gives off more radiation at every wavelength, so the luminosity of the object should increase. more luminous and bluer

The "square" in the inverse square law for intensity of light means that

at three times the distance, the intensity is 1/9 as great

Imagine that you observe a star/planet system, edge-on. When the planet is moving away from Earth, the light from the star is

blueshifted

Place the names of the types of radiation in their correct places in the EM spectrum. (You may have to scroll to see all options.)

left to right Gamma rays X-Rays ultraviolet visible light infrared Microwaves Radio

Identify the colors of emitted photons from electron transitions in the hydrogen atom.

left to right red greenish-blue blueish-violet violet

Rank the types of radiation in order of their energy, from least to greatest.

left to right on spectrum less wavelength/ greatest energy purple (gama rays) blue (X-rays) blue/green (ultraviolet) rainbow (visible light) yellow (infrared) orange (mircrowave) red (FM-Radio-AM) longest wave length/ lower energy least energy Radio waves infrared red visible light blue visible light X-rays gamma rays Most energy

On the following electromagnetic spectrum, identify the frequency of the wavelengths on each side of the spectrum.

longer wavelength= lower frequency shorter wavelength = higher frequency

The bright, colorful "stripes" of a rainbow such as the one shown here follow a particular order. Rank each color of the rainbow by how much energy is carried by its electromagnetic waves, from highest to lowest.

lowest wave length= most energy carries most energy blue yellow orange red carries least energy

These three images show the same type of star and the peak wavelength of the stars as observed by someone on Earth. If these stars are moving away from Earth, rank them in order from slowest to fastest speed, based on wavelength

slowest shortest wavelength medium wavelength longest wavelength fastest

Imagine that you observe a star-planet system, edge-on. When the planet is moving away from Earth, in which direction is the star moving?

toward earth