Telescopes And Waves Flashcards
What is the distance (length) between two peaks of waves?
Wavelengths
What is the number of wave crests in a given period of time?
Frequency
What is produced when visible light passes through a cloud of gas?
Absorption line spectrum
What is the range of light waves that expend from the wavelength of radio waves to gamma rays?
Electromagnetic Spectrum
What is the range of light waves that we can SEE (ROYGBIV)?
Visible light
What is the change of a wave length due to the movement of an object?
Doppler effect
What is the number of times LARGER an object appears through a telescope compared to the naked eye?
Magnification
What is the measure of the clarity of images?
Resolution
What spectrum is produced when a gas is heated?
Emission line spectrum
What is the height of waves (how tall the waves are)?
Amplitude
What are “thermal radiation” waves emitted by a heated object?
Blackbody Radiation
What is the color of the hottest stars?
Blue
What is the color of the coolest stars?
Red
What is it when man made light reduces the visibility of the stars?
Light pollution
When the build up of sound waves reach a person - - it creates what?
Sonic Boom
What is the bending of light as it passes through an object (such as a lens)?
Refraction
Which will NOT create a spectra?
A. Prism
B. CD’s
C. Mirror
C. Mirror
One of the reasons that the Hubble space telescope is better than the ones on earth is . . .
A. It does not use mirrors and lens
B. It is a radio telescope
C. The light does not pass through the atmosphere
C. The light does not pass through the atmosphere
What are the only two parts of the electromagnetic spectrum that make it to the earth’s surface?
A. Gamma rays and radio waves
B. Visible light and radio waves
C. UV rays and X-Rays
B. Visible light and radio waves
When a boat moves faster then the waves in front - it produces waves that _________ and form a “V”
A. Weaken
B. Disappear
C. Overlap
C. Overlap
As a boat moves faster, then the waves, in front of the boat - they begin to _______________.
A. Compress
B. Expand
C. Weaken
A. Compress
What makes seeing stars in cities difficult?
A. Air pollution
B. Can’t set up a telescope
C. Light pollution
C. Light pollution
Why do stars twinkle?
A. Turbulence of the atmosphere
B. Pulsing of energy from stars
C. Death of the stars
A. Turbulence of the atmosphere
What is the distance between the lens and the focal point called?
A. Focal point
B. Focal length
C. Resolution
B. Focal length
What increases on a telescope with a long focal length?
A. Resolving power
B. Brightness
C. Magnification
C. Magnification
What is a telescope that has two lens (and eyepiece and objective called?
A. Refraction telescope
B. Reflecting telescope
C. Space telescope
A. Refraction telescope
What can you NOT learn from a spectrum of a star?
A. Composition
B. Speed
C. Distance
C. Distance
What doe NOT happen when things get hotter?
A. The color changes
B. The wavelength shortens
C. The object changes to a different compound
C. The object changes to a different compound
What is the measure of the amount of light collected by a telescope?
Brightness
What is caused by a star moving away from the observer?
Red Shift
What type of lens is thicker in the middle and bends light to a focal point?
Convex
What is caused when a star is moving TOWARD the observer?
Blue Shift
What is the rebounding of light off of a smooth surface?
Reflection
What does the red shift and blue shift of a star tell us?
Velocity
What are the reasons we use an optical telescope?
Brighten
Magnify
Resolve
What can telescopes with long focal length increase?
Magnification
What does Blackbody radiation tell us about the stars?
Temperature
What kind of telescope do we use to study naturally occurring radio light from stars, galaxies, black holes and other astronomical objects?
Radio telescopes
Be able to to label a drawing of light rays going through a lens.
See your notes.
