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