Our Evolving Universe
Self Test 2

1. Which of the following light sources would emit a continuous spectrum?
   1. tungsten-filament bulb
   2. sodium streetlight
   3. neon advertising sign
   4. mercury vapour streetlight
   
   
2. For a blackbody of a given size, the amount of light emitted depends
   1. only on the chemical composition
   2. only on the temperature
   3. on the temperature and the chemical composition
   4. on the temperature, the chemical composition, and other things
   
   
3. If the Sun's surface temperature were to increase by a factor of two, the Sun would appear
   1. brighter and more blue
   2. brighter and more red
   3. the same brightness, but a different colour
   4. the same colour, but brighter
   
   
4. The increase in temperature would
   1. not change the spectral lines
   2. change the positions of the lines, but not their intensity
   3. change the relative intensities of different lines, but not their positions
   4. change both the intensity and the position of each line
   
   
5. A certain gas is known to produce an emission line at a wavelength of 590 nm when the gas is heated to 2000 K. You observe light from a lamp containing this gas and measure the wavelength of the line to be 587 nm. You conclude that the lamp
   1. is moving away from you
   2. is hotter than 2000 K
   3. is cooler than 2000 K
   4. is moving towards you

out of 5.

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