Astronomy & Cosmology Chap 2 Question

As you make an electromagnetic wave oscillate up and down more often (increase the frequency), which of the following happen?

The energy per photon increases

The wavelength decreases

The wave speed stays the same

Waves have a property called frequency (how many times per second the wave bumps up or down). For light waves, frequency corresponds to our perception of:

Amplitude

Which of the following correctly describes wavelength?

The distance between successive bumps or crests of a wave

For light traveling through a vacuum, which statement is correct?

All electromagnetic waves travel at the same speed.

Which visible color has the higher frequency?

Blue

Which visible color has the longer wavelength?

Red

Which everyday word corresponds most closely to the amplitude of a light wave?

Brightness

Light travels through a vacuum at approximately:

3.0 × 10⁸ m/s

Order the following electromagnetic waves from highest frequency to lowest frequency.

Xrays

Ultraviolet light

Orange light

Microwaves

Radiowaves

Order the following electromagnetic waves from longest wavelength to shortest wavelength.

Radiowaves

Microwaves

Infrared light

Green light

Gamma rays

Which of the following electromagnetic waves has the shortest wavelength?

X-rays

Which of the following has the highest-energy photons?

X-rays

If the frequency of light increases, what happens to its wavelength?

It decreases.

If the wavelength of light increases, what happens to the energy per photon?

It decreases.

Which equation correctly describes the relationship between wave speed, frequency, and wavelength?

v = fλ

Electromagnetic radiation behaves as though it has properties of both and .

particles

waves

What is a photon?

A tiny massless particle that carries energy

Which statement about photons is correct?

Shorter-wavelength photons have more energy.

Why can radio waves from a Wi-Fi router pass through a house wall while visible light from a flashlight generally cannot?

Different materials allow some wavelengths of electromagnetic radiation to pass while absorbing others.

A red piece of stained glass appears red because:

It reflects and/or allows red wavelengths while other wavelengths are absorbed.

Why are different wavelengths of electromagnetic radiation useful in astronomy?

Different wavelengths can provide different information about celestial objects.

According to the professor's slides, studying electromagnetic radiation from an astronomical object can help astronomers determine which of the following?

The object's speed toward or away from us

Which type of telescope can be built on Earth's surface and used properly according to the material from your assignment?

Radio telescope

Why do astronomers sometimes place telescopes in space?

Earth's atmosphere acts as a filter and does not allow all wavelengths of electromagnetic radiation through equally.

You observe two sources that emit the same number of photons per second. One source emits red light and the other emits blue light. Which source has the more energetic individual photons?

Blue light

We've learned that optical light and wifi waves are all the same electromagnetic waves with some different parameters. Which of these best explains the fact that you cannot see a flashlight through a wall but your phone can "see" the wifi router through a wall?

Different materials absorb some wavelengths of light and transmit other wavelengths of light. House walls seem to absorb short wavelength EM waves while allowing longer wavelength EM waves to pass through.

Order the following EM waves from highest frequency to lowest frequency

X-rays

Green light

Orange light

Microwaves

Waves have a property called wavelength (the separation between two peaks or two troughs of a wave). For light waves, wavelength corresponds to our perception of:

Color

You wake up in a dark room. You have been captured by the infamous Jigsaw who is testing your knowledge of astronomy and astrophysics. To escape this dark room, where you will otherwise die of starvation, you have in front of you four incredibly bright lamps in front of you that each emit the same number of photons (light particles) per second. The objective of the game is for you to turn on one of the sources of light and sit in front of it for 2 hours and endure the least amount of damage so you can walk out alive. Which lamp do you choose to turn on? Live or die, the choice is yours.

The radio lamp

Which of the following telescopes can be built on the surface of the Earth and used properly?

Radio telescopes

Optical telescopes