Homework - the EM spectrum

Homework - the EM spectrum

What type of waves are electromagnetic waves?

1. Longitudinal waves
2. Transverse waves
3. Surface waves
4. Sound waves

How do the vibrations of electric and magnetic fields relate to the direction of the wave?

1. At right angles
2. Opposite
3. Random
4. Parallel

What is the speed of light in a vacuum?

1. 300,000,000 m/s
2. 150,000,000 m/s
3. 600,000,000 m/s
4. 450,000,000 m/s

What causes electromagnetic waves?

1. Vibrating electric and magnetic fields
2. Temperature
3. Friction
4. Gravity

What is the nature of electromagnetic waves?

1. Longitudinal
2. Elliptical
3. Transverse
4. Circular

What is the full range of the electromagnetic spectrum?

1. Radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, gamma rays
2. Sound waves, visible light, ultraviolet, infrared

Which type of electromagnetic radiation has the longest wavelength?

1. Visible light
2. Radio waves
3. Ultraviolet
4. X-rays

What is the speed of light in a vacuum?

1. 150,000,000 meters per second
2. 200,000,000 meters per second
3. 250,000,000 meters per second
4. 299,792,458 meters per second

What are the primary colors of visible light?

1. Red, yellow, blue
2. Red, green, blue
3. Green, yellow, blue
4. Yellow, cyan, magenta

Which electromagnetic waves have the highest energy?

1. Infrared
2. Gamma rays
3. Microwaves
4. Visible light

Which section of the electromagnetic spectrum has the longest wavelength?

1. Ultraviolet radiation
2. Visible light
3. Radio waves
4. X-rays

Which section of the electromagnetic spectrum is used in WiFi and cell phones?

1. Infrared radiation
2. Gamma rays
3. Microwaves
4. UV rays

Which section of the electromagnetic spectrum is used in night vision technology?

1. Visible light
2. Ultraviolet radiation
3. Radio waves
4. Infrared radiation

Which section of the electromagnetic spectrum is harmful to living organisms in large doses?

1. Visible light
2. Microwaves
3. Gamma rays
4. Infrared radiation

Which section of the electromagnetic spectrum is responsible for sunburns?

1. Ultraviolet radiation
2. Infrared radiation
3. Microwaves
4. Radio waves

Hubble Spots a Galaxy Hidden in a Dark Cloud

The subject of this image taken with the NASA/ESA Hubble Space Telescope is the spiral galaxy IC 4633, located 100 million light-years away from us in the constellation Apus. IC 4633 is a galaxy rich in star-forming activity and also hosts an active galactic nucleus at its core. From our point of view, the galaxy is tilted mostly towards us, giving astronomers a fairly good view of its billions of stars.

Hubble Spots a Galaxy Hidden in a Dark Cloud

However, we can’t fully appreciate the features of this galaxy — at least in visible light — because it’s partially concealed by a stretch of dark dust (lower-right third of the image). This dark nebula is part of the Chamaeleon star-forming region, itself located only around 500 light-years from us, in a nearby part of our Milky Way galaxy. The dark clouds in the Chamaeleon region occupy a large area of the southern sky, covering their namesake constellation but also encroaching on nearby constellations, like Apus. The cloud is well-studied for its treasury of young stars, particularly the cloud Cha I, which both Hubble and the NASA/ESA/CSA James Webb Space Telescope have imaged.

Hubble Spots a Galaxy Hidden in a Dark Cloud

The cloud overlapping IC 4633 lies east of the well-known Cha I, II, and III, and is also known as MW9 and the South Celestial Serpent. Classified as an integrated flux nebula (IFN) — a cloud of gas and dust in the Milky Way galaxy that’s not near to any single star and is only faintly lit by the total light of all the galaxy’s stars — this vast, narrow trail of faint gas that snakes over the southern celestial pole is much more subdued looking than its neighbors. Hubble has no problem making out the South Celestial Serpent, though this image captures only a tiny part of it.

What is the distance of the spiral galaxy IC 4633 from us?

1. 200 million light-years
2. 1 billion light-years
3. 500 light-years
4. 100 million light-years

What is the name of the star-forming region that partially conceals the galaxy?

1. Orion
2. Pleiades
3. Chamaeleon
4. Taurus

What type of nebula is the dark cloud overlapping IC 4633?

1. integrated flux nebula (IFN)
2. reflection nebula
3. emission nebula
4. planetary nebula

Which space telescopes have imaged the cloud Cha I in the Chamaeleon region?

1. Kepler and SOFIA
2. VLT and ALMA
3. Hubble and the NASA/ESA/CSA James Webb Space Telescope
4. Spitzer and Chandra

What is another name for the cloud overlapping IC 4633?

1. Draco and the Little Dipper
2. Andromeda and the Whirlpool
3. MW9 and the South Celestial Serpent
4. Orion's Belt and the Big Dipper