Show:
Light
EM Spectrum
Optical Telescopes
Detectors & Radio Telescopes
Telescopes & the Atmosphere
100
Light is this type of wave.
What is transverse wave? It moves up and down and does not require a medium.
100
Cause of electromagentic waves (light).
What are changing electric and magnetic fields?
100

Type of telescope that uses mirrors.

What is reflector?

100

Device used to collect light from a telescope and make an image.

What is a CCD, charge-coupled device?

100

Reason to put an infrared telescope on an airplane.

What is get above most of the water in the atmosphere?

200
The height of a wave or its intensity.
What is amplitude?
200
Type of light with the shortest wavelength.
What is gamma rays? In order of increasing wavelength: gamma, x-rays, UV, visible (blue to red), IR, Microwave, Radio
200

This is what we mean by "size" of a telescope.

What is aperture? Or how big is the primary lens or mirror.

200

In a CCD, this creates a charge in a pixel.

What is a photon? Each charge then sends a signal to a computer. The computer added up charges/photons to make an image.

200

Where to put your telescope to view X-rays.

What is space?

300
Because the speed of light is a constant, if you increase the wavelength of light, this property decreases.
What is frequency? Long wavelength light has low frequency.
300
Speed of radio waves.
What is lightspeed or the speed of light? All EM waves travel at the speed of light.
300

Location of the primary lens in a refractor.

What is at the opening to the sky? The end farthest from the eye of the observer.

300

This is what radio telescopes use to collect light.

What is a large dish? Collects waves and directs them to the antenna. Antenna is like the CCD for radio telescopes, sends signal to computer. Radio telescopes do not use lenses or mirrors.

300

Wavelengths of light that can be observed from earth's surface.

What is visible and radio?

400

Particle of light that carries energy.

What is a photon?

400
Light with the lowest frequency and energy.
What is radio waves? They also have the longest wavelength.
400

Why astronomers don't use big refractors for research.

What is the weight of the lens - it's too heavy? Also, the telescope has to be too long to get a large image from a long focal length.

500
Color of visible light with the highest energy.
What is blue (or violet)? Blue light also has the highest frequency and shortest wavelength.
500
Increasing the wavelength of green light makes it this color.
What is yellow? This will move the light closer to the red end of the rainbow, so the next color in that direction is yellow. This will also decrease the frequency and energy of the light.
500

Part of a reflector that allows it to have a long focal length, but still be a short telescope.

What is the secondary mirror? It bounces light back from the primary (at the base of the telescope) to the eye (also at the base). So the focal length is longer than the actual telescope.