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Wednesday, September 19, 2012

Astronomy

1.

 
A wave's velocity is the product of the
  Student Response Value Correct Answer
frequency times the period of the wave.  
period times the energy of the wave.  
amplitude times the frequency of the wave.  
amplitude times the wavelength of the wave.  
Student Response frequency times the wavelength of the wave. 100% Student Response  
Score: 1/1
 

2.

 
Consider this diagram. Which statement is true?

f12g1_r.jpg
  Student Response Value Correct Answer
Student Response The amplitude is 4. 100% Student Response  
The amplitude is 6.  
The amplitude is 12.  
The amplitude is 8.  
The amplitude cannot be determined from this diagram.  
Score: 1/1
 

3.

 
Which of these is constant for ALL types of electromagnetic radiation in a vacuum?
  Student Response Value Correct Answer
amplitude  
frequency  
wavelength  
Student Response velocity 100% Student Response  
photon energy  
Score: 1/1
 

4.

 
Which form of electromagnetic radiation is absorbed by carbon dioxide and water vapor in our atmosphere? (see section on opacity)
  Student Response Value Correct Answer
Student Response infrared 100% Student Response  
radio  
gamma rays  
visible light  
ultraviolet  
Score: 1/1
 

5.

 
Which form of electromagnetic radiation would be blocked in the stratosphere by ozone? (see section on opacity)
  Student Response Value Correct Answer
visible light  
microwaves  
Student Response ultraviolet 100% Student Response  
cosmic rays  
infrared  
Score: 1/1
 

6.

 
The two forms of electromagnetic radiation that penetrate the atmosphere best are:
  Student Response Value Correct Answer
ultraviolet and visible light.  
Student Response visible and radio waves. 100% Student Response  
X-rays and gamma rays.  
infrared and microwaves.  
visible and infrared light.  
Score: 1/1
 

7.

 
Of all the forms of electromagnetic radiation, the one with the lowest frequency is
  Student Response Value Correct Answer
gamma rays.  
visible light.  
ultraviolet rays.  
microwaves.  
Student Response radio waves. 100% Student Response  
Score: 1/1
 

8.

 
Electromagnetic radiation with a wavelength of 700 nm would be:
  Student Response Value Correct Answer
microwaves.  
violet light.  
ultraviolet light.  
X-rays.  
Student Response red light. 100% Student Response  
Score: 1/1
 

9.

 
There are no radio telescopes in space because
  Student Response Value Correct Answer
there is too much radio noise in space, so a radio telescope won't work out there  
you need an array, like the VLA to detect ANY radio radiation, so it is just not realistic to put an entire array in space  
no one has built an antenna large enough to reach astronomical objects yet  
Student Response radio waves penetrate Earth's atmosphere so there is no need to put one in space 100% Student Response  
radio telescopes are too fragile and expensive to make to put into space  
Score: 1/1
 

10.

 
The Doppler Effect is a phenomenon that allows one to measure an object's
  Student Response Value Correct Answer
chemical composition.  
tangential motion.  
temperature.  
Student Response radial motion. 100% Student Response  
radius.  
Score: 1/1
 

11.

 
When an objects is moving away from us, their wavelength seems
  Student Response Value Correct Answer
lower  
Student Response higher 100% Student Response  
the same  
Score: 1/1
 

12.

 
A mechanical wave is moving at 40 m/s and its frequency is 20 HZ, its wavelength in m is
  Student Response Value Correct Answer
Student Response 2 100% Student Response  
40  
8  
0.5  
Score: 1/1
 

13.

 
All electromagnetic vave move in vaccum at the same
  Student Response Value Correct Answer
Student Response speed 100% Student Response  
frequency  
period  
wavelength  
Score: 1/1
 

14.

 
Electromagnetic radiation
  Student Response Value Correct Answer
can only travel in a dense medium.  
is the same as a sound wave.  
Student Response has only the properties of waves. 0%  
has nothing in common with radio waves.  
can behave both as a wave and as a particle. Student Response  
Score: 0/1
 

15.

 
The Earth's ionosphere partially blocks which form of electromagnetic radiation?
  Student Response Value Correct Answer
infrared  
visible light  
Student Response gamma rays 0%  
radio Student Response  
ultraviolet  
Score: 0/1
 

16.

 
The visible color of electromagnetic radiation that has the shortest wavelength is
  Student Response Value Correct Answer
green.  
Student Response violet. 100% Student Response  
blue.  
red.  
orange.  
Score: 1/1
 

17.

 
Colors appear different to us because of their photons' different:
  Student Response Value Correct Answer
polarization.  
speeds.  
Student Response frequencies. 100% Student Response  
magnetic fields.  
amplitudes.  
Score: 1/1
 

18.

 
There are no X-ray telescopes on Earth because
  Student Response Value Correct Answer
we can't figure out how to direct an X-ray beam through space  
no one has yet invented an X-ray telescope that works  
there are no astronomical objects that emit X-rays  
they are too expensive to build  
Student Response X-rays don't penetrate Earth's atmosphere 100% Student Response  
Score: 1/1
 

19.

 
The radiation our eyes are most sensitive to lies in the color
  Student Response Value Correct Answer
red at 6563 Angstroms.  
violet at 7,000 Angstroms.  
blue at 4,321 nanometers.  
Student Response yellow-green at about 550 nm. 100% Student Response  
black at 227 nm.  
Score: 1/1
 

20.

 
If a light source is approaching you at a speed very close to the speed of light, it will appear (see doppler effect)
  Student Response Value Correct Answer
brighter than it is.  
redder than it is.  
Student Response bluer than it is. 100% Student Response  
lower temperature than it is.  
fainter than it is.  
Score: 1/1

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