When you listen to the radio you are hearing
a. radio waves
b. visible light
c. x rays
d. none of these
d
Of the objects listed below, which emits the most infrared radiation?
a. the sun
b. earth
c. a star that is the same size as the sun but is five times hotter
c
If an atom contained only four energy levels, how many possible different emission lines could it emit?
a. 4
b. 5
c. 6
d. 7
c
The energy of a photon is directly proportional to
a. energy levels
b. frequency
c. amplitude
d. speed
b
To say that an atom is excited is to say it has boosted
a. atoms
b. incandescent solids
c. molecules
d. electrons
d
How does the intensity at a given wavelength change if you increase temperature?
a. the intensity increases
b. the intensity stays the same
c. the intensity decreases
a
How does the wavelength at which the maximum intensity occurs change when you increase the temperature?
a. The wavelength stays the same.
b. The wavelength decreases.
c. The wavelength increases.
b
How does the total energy per unit area emitted by the object change when you increase the temperature, and how do you know this from the graph provided?
a. The total energy per unit area increases; we know this because the area under the graph increases
a
The peak frequency of emitted radiation is directly proportional to
a. absolute temperature
b. speed of travel
c. energy
d. wavelength
a
Match the following
a. Continuous
b. Emission
c. Absorption
d. cool gas, hot bulb
e. hot bulb
f. heated hydrogen gas
a, e
b, f
c, d
Which of the following are in the emission spectrum?
a. emission nebula
b. sun
c. atmosphere on titan
d. planetary nebula
a, d
Which of the following are in the absorption spectrum?
a. emission nebula
b. sun
c. atmosphere on titan
d. planetary nebula
b, c
Spectral lines screen in the solar spectrum are due to
a. frequency differences
b. energy differences
c. temperature differences
d. absorption
d
The kind of lamp that is most expected to play a greater role in coming years involves
a. florescence
b. light-emitting diodes
c. incandescence
d. compact florescence
b
The main difference between laser light and ordinary light involves
a. straightness of path
b. color
c. frequency
d. coherence
d
As a solid is gradually heated, the first color to glow is
a. blue
b. red
c. white
d. yellow
b
The spectral lines are most distinct when viewed in mercury vapor lamp under
a. low pressure
b. high pressure
c. same for each
a
The energy of a photon depends on its
a. amplitude
b. frequency
c. speed
d. all of these
e. none of these
b
Which light source is more energy-efficient?
a. a florescent lamp
b. an incandescent lamp
c. both about the same
a
Light from a phosphorescent source
a. takes longer to travel from the source to you
b. normally has a shorter wavelength than the light that initially produced it
c. is cooler than light from a florescent source
d. all of these
e. none of these
e
Comparing the light from a glowing neon gas with light in the beam of a helium-neon laser, we find the greater number of spectral lines in light from the
a. neon gas tube
b. laser beam
c. both about the same
a
The hottest star is the star that glows
a. white
b. blue
c. red
d. cannot be determined
b
A paint pigment that absorbs red light and gives off blue light
a. is fluorescent
b. is polarized
c. doesn't exist
d. is used in lasers
e. is phosphorescent
c
A certain object emits infrared waves. If it were to emit light waves instead, its temperature would have to be
a. higher
b. the same, temperature doesn't make any difference
c. lower
a
If light in a spectroscope passed through round holes instead of slits, spectral lines would appear
a. round
b. dimmer
c. as thicker lines
a
Green light emitted by excited mercury vector corresponds to a particular energy transition in the mercury atom. A more energetic transition might emit
a. either red or blue light
b. blue light
c. red light
d. white light
b
Compared to the energy put into a laser, the energy of the laser beam is
a. the same
b. less
c. more
b
Astronomers can tell whether a star is approaching or receding from Earth by
a. its temperature
b. the doppler effect
c. its change in temperature
d. its absorption spectra
e. all of these
b
The dark lines in the sun's spectrum represent light that is
a. not emitted by the sun
b. emitted by the sun
c. absorbed by the sun's atmosphere
c
Discrete spectral lines occur when excitation takes place in a
a. gas
b. solid
c. spectroconductor
d. liquid
e. all of these
a
Light from two closely spaced stars will not produce a steady interference pattern at the Earth's surface because of
a. their non-point like natures
b. incoherence
c. the inherent instability of the atmosphere
d. their different radial distances
e. closel
b
Compared to the energy of a photon of light, the energy of a phonon of blue light is
a. more
b. the same
c. less
a
Ultraviolet light is
a. present everywhere
b. produced by crossed polaroids
c. more energetic tan x-rays
d. electromagnetic energy
e. none of these
d
Which color of light carries the most energy per photon?
a. green
b. blue
c. red
d. violet
e. all of these
d
The highest frequency light is those below
a. green
b. red
c. blue
d. violet
e. all the same
d
An atom that absorbs a photon of a certain energy can then emit
a. a photon of any energy
b. only a photon of the same or lower energy
c. only a photon of the same or higher energy
d. only a photon of that energy
b
Light is emitted when an electron
a. makes a transition to a lower energy level
b. is boosted to a higher energy level
c. neither of these
a
Light from a lit match comes from
a. protons
b. neutrons
c. electrons
d. all of these
c
Which has the greatest energy - a photon of infrared light, of visible light or of ultraviolet light?
a. a photon of visible light
b. a photon of infrared light
c. a photon of ultraviolet light
c
The variety of colors seen in a burning log comes from the variety of
a. multi-layered incandescent surfaces
b. electron transitions in various atoms
c. temperatures
d. absorbing gases between the log and viewer
e. chemicals in the log
b