Telescopes And Waves Flashcards by Holy Cross

What is the distance (length) between two peaks of waves?

Wavelengths

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What is the number of wave crests in a given period of time?

Frequency

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What is produced when visible light passes through a cloud of gas?

Absorption line spectrum

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What is the range of light waves that expend from the wavelength of radio waves to gamma rays?

Electromagnetic Spectrum

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What is the range of light waves that we can SEE (ROYGBIV)?

Visible light

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What is the change of a wave length due to the movement of an object?

Doppler effect

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What is the number of times LARGER an object appears through a telescope compared to the naked eye?

Magnification

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What is the measure of the clarity of images?

Resolution

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What spectrum is produced when a gas is heated?

Emission line spectrum

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What is the height of waves (how tall the waves are)?

Amplitude

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What are “thermal radiation” waves emitted by a heated object?

Blackbody Radiation

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What is the color of the hottest stars?

Blue

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What is the color of the coolest stars?

Red

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What is it when man made light reduces the visibility of the stars?

Light pollution

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When the build up of sound waves reach a person - - it creates what?

Sonic Boom

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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.

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