UCCS PES 1100: Astronomy Lab II
1
name: __________________________
Light is radiant energy in the form of a stream of energy particles, called photons.
Light is radiant energy in the form of a wave of electromagnetic energy.
Both a and b.
Neither a nor b.
Assuming that light could curve around the Earth, about how long would it take for one trip?
a)
b)
c)
d)
3
Light and Atoms Lab
What is light?
a)
b)
c)
d)
2
Spring 2012
1/7th second.
1 second.
7 seconds.
7 minutes.
What is the approximate wavelength of deep red light?
a)
b)
c)
d)
5 m.
7 cm
400 nm.
700 nm
4 List these electromagnetic radiations from short to long wavelengths.
a)
b)
c)
d)
5
Visible light,
Ultraviolet,
Visible light,
Infrared,
Infrared,
X-rays,
Ultraviolet,
X-rays,
Radio waves
Gamma rays
Radio waves
Gamma rays
Gamma rays,
Radio waves,
Gamma rays,
Radio waves,
X-rays,
Infrared,
X-rays,
Ultraviolet,
Ultraviolet,
Visible light,
Infrared,
Visible light,
Visible light,
Ultraviolet,
Visible light,
Infrared,
Infrared,
X-rays,
Ultraviolet,
X-rays,
Radio waves
Gamma rays
Radio waves
Gamma rays
appear darker than
radiate the same intensity of wavelengths as
radiate more strongly at shorter wavelengths than
appear the same color as
What is the difference between emission and absorption in an atom?
a)
b)
c)
d)
8
Ultraviolet,
Visible light,
Infrared,
Visible light,
According to Wien's law, a hotter object will __ a cooler object.
a)
b)
c)
d)
7
X-rays,
Infrared,
X-rays,
Ultraviolet,
List these electromagnetic radiations from lowest to highest energy.
a)
b)
c)
d)
6
Gamma rays,
Radio waves,
Gamma rays,
Radio waves,
In emission, the nucleus goes from a lower to a higher orbit.
In emission, the electron goes from a higher to a lower orbit.
In absorption, the electron goes from a higher to a lower orbit.
Both b and c.
What is the relationship between: wavelength (λ) and: frequency (f)? ("c" is the speed of light)
a)
b)
c)
d)
(λ) (f) = c
(λ) / (f) = c
(f) / (λ) = c
(λ) (c) = f
9
Which of these are effects of the Doppler shift?
a)
b)
c)
d)
10
Of these gases in the Earth's atmosphere, which strongly absorbs infrared radiation?
a)
b)
c)
d)
11
Continuous.
Emission line.
Absorption line.
None of the above.
What are some of the things astronomers can learn about astronomical objects from their spectra?
a)
b)
c)
d)
16
Continuous.
Emission line.
Absorption line.
None of the above.
What type of spectrum is emitted by a hot, tenuous gas?
a)
b)
c)
d)
15
Continuous.
Emission line.
Absorption line.
None of the above.
What type of spectrum is observed when the light from a hot, dense body is seen through a cooler, tenuous gas?
a)
b)
c)
d)
14
Ozone and oxygen
Nitrogen and argon.
Water vapor and carbon dioxide
None of the above.
What type of spectrum is emitted by a heated solid object (such as the filament of an incandescent bulb)?
a)
b)
c)
d)
13
Water vapour.
Nitrogen.
Ozone.
Both a and c.
Which gas(es) in the Earth's atmosphere strongly absorb ultraviolet radiation?
a)
b)
c)
d)
12
When an object is moving: toward us, the wavelengths of its light decrease.
When an object is moving: away from us, the wavelengths of its light get longer.
When an object accelerates, the wavelengths of its light get warmer
Both a and b are correct.
Chemical composition.
Whether a gas or solid or combination, due to the type of spectrum.
How fast the objects are moving.
All of the above
Photons produce light when striking the retina, thus releasing energy causing a chemical change in the __________
cells.
a)
b)
c)
d)
Photoreceptor
Pupil
Iris
Optic nerve
17.
Light moves in a straight line in the vacuum of space at:
a.
b.
c.
d.
18.
Colour is determined by light’s _________
a.
b.
c.
d.
19.
Blue;
Red;
Red
Blue
Hot bodies or objects emit _________ light.
a.
b.
c.
d.
25.
Emission
Absorption
_________ light carries more energy than __________ light.
a.
b.
24.
Emission
Absorption
Energy is released when an electron drops from an upper to a lower orbital, causing the atom to emit electro-magnetic
radiation. Thus it is called:
a.
b.
23.
Faster
Slower
Straight
Spiked
An atom can absorb a photon if its energy matches the energy required for an electron to jump to a higher orbital.
Thus it is called:
a.
b.
22.
Amplitude
Troughs
Frequency
nm (nanometers)
If a λ (wavelength) is longer, then its frequency will be: _________.
a.
b.
c.
d.
21.
Brightness “B”
Luminosity “L”
Watts “W”
Wavelength (λ)
The number of wave crests that pass a given point in one second is called: _________
a.
b.
c.
d.
20.
186,000 km/sec
300,000 mi/sec
c
6.76 x 10^-11
Red
Blue
Yellow
Green
The colour blue has a wavelength of approximately:
a.
b.
c.
d.
400 nm
480 nm
580 nm
700 nm