Understanding Light and the Electromagnetic Spectrum

What is the electromagnetic spectrum?

• A spectrum of visible colors only

• A measurement of temperature

• A type of sound wave

• A range of all types of light waves

How do instruments like telescopes help us understand the universe?

• They measure the temperature of stars

• They capture large amounts of light to see distant objects

• They amplify sound waves

• They create artificial light

What causes the sky to appear blue during the day?

• Presence of blue gases in the atmosphere

• Scattering of blue wavelengths by the atmosphere

• Absorption of red light

• Reflection of the ocean

What is redshift?

• A shift in light towards shorter wavelengths

• A type of light emitted by red stars

• A stretching of light to longer wavelengths as galaxies move away

• A phenomenon where light waves are absorbed by black holes

Why are some parts of the universe invisible to us?

• Because they emit only sound waves

• Due to the presence of dark matter and black holes

• Because they are too bright

• Due to the lack of telescopes