Telescopes can be used to magnify an image and to gather light from a faint image. Which of these two uses would be most important to an astronomer studying the stars?
gather light from a faint object
magnify the size of an image
Why are most infrared observatories located on high mountains?
to keep the highly dangerous instruments away from people
to get above most of the water in the atmosphere
you can't fool me, most infrared observatories are not located on high mountains
to be closer to the stars and planets
A transparent material that brings light to a focus.
lens
mirror
diffraction grating
prism
A _____ telescope has a lens as its major element.
refracting
reflecting
electron
complex
A _____ telescope has a mirror as its major element.
refracting
complex
electron
reflecting
Which of the following consists of electromagnetic waves with the shortest wavelength?
a beam of blue light
a beam of red light
the x-rays in your dentist's office
a radio broadcast of last Saturday's football game
Which of the following consists of electromagnetic waves with the longest wavelength?
the x-rays in your dentist's office
a beam of blue light
a radio broadcast of last Saturday's football game
a beam of red light
Electromagnetic radiation is usually described as traveling as a wave. Which visible color has the longest wavelength?
red
yellow
green
violet
What atmospheric gas is responsible for limiting the amount of infrared radiation that reaches the earth's surface?
water vapor
ozone
argon
nitrogen
What color is found between red and yellow in the visible spectrum?
green
orange
indigo
blue
The range of electromagnetic radiation from gamma-rays through radio waves.
wavelength
magnification
prism
spectrum
The distance between one crest of a wave to the next.
wavelength
frequency
amplitude
period
This kind of radiation includes gamma rays, x-rays, ultraviolet, visible light, infrared, and radio waves.
electromagnetic
visible
alpha
beta
A veering (bending) of light rays when they enter a piece of glass is called
reflection
cassegraining
refraction
aberration
The colors of the visible spectrum.
OBAFGKM
ROYGBIV
COSDEMP
MVEMJSUNP
A small lens used in both refracting and reflecting telescopes.
eyepiece
prism
objective
mirror
What type of electromagnetic radiation has just slightly too short a wavelength to be visible?
ultraviolet
gamma ray
radio
infrared
Where would be the best place to locate a telescope for observing gamma rays from celestial objects?
on a space station
near the ocean
on a mountain top in the desert
near a hospital
The larger of the lenses used in a refracting telescope.
mirror
prism
objective
eyepiece
The bending of light as it passes from one material into another.
reflection
reverberation
resolution
refraction
Radiation that is just a bit too long to be visible.
x-rays
ultraviolet
infrared
radio
An astronomer's description of how clear the sky is.
transparency
brightness
seeing
resolution
Radiation that has a wavelength that is just a little too short to be visible.
radio
infrared
ultraviolet
x-rays
Electromagnetic radiation is usually described as traveling as a wave. Which visible color has the shortest wavelength?
violet
yellow
red
green
Which form of electromagnetic radiation below DOES NOT penetrate very far through our atmosphere?
X-rays
Radio waves
Infrared
Visible Light
Blue-jean blue.
cyan
yellow
magenta
indigo
A three dimensional parabola. A mirror of this shape can focus parallel light to point.
oblate spheroid
paraboloid
spherical
cube
What atmospheric gas is responsible for limiting the amount of ultraviolet and X-ray radiation that reaches the earth's surface?
argon
water vapor
ozone
nitrogen
Telescopes can be used to magnify an image and to gather light from a faint image. Which of these two uses would be most important to an astronomer studying Mars?
magnify the size of an image
gather light from a faint object
Most of the radiation from space is blocked by this. It also limits earth-based telescopes' resolution.
atmosphere
oceans
skylab
empty space
What type of electromagnetic radiation has just slightly too long a wavelength to be visible?
radio
gamma ray
ultraviolet
infrared
An astronomer's description of the steadiness of the Earth's atmosphere.
resolution
brightness
transparency
seeing
What color is found between blue and violet in the visible spectrum?
indigo
yellow
green
orange
What color is found between blue and yellow in the visible spectrum?
indigo
green
red
orange
What color is found between green and indigo in the visible spectrum?
orange
green
red
blue
The ability of an optical device to distinguish fine detail in an image.
reverberation
resolution
refraction
reflection
How is visible light different from radio waves?
radio waves have longer wavelengths than visible light
visible light is less energetic than radio waves
visible light travels at a slower speed than radio waves
radio waves travel at a slower speed than visible light