Doppler Effect Presentation Study Guide

The Doppler Effect is a phenomenon observed when there is a change in frequency or wavelength of a wave in relation to an observer who is moving relative to the wave source.

• A change in wave speed due to medium change

• A change in wave frequency due to relative motion

• A change in wave amplitude due to distance

• A change in wave direction due to reflection

What does red-shift mean? What does blue-shift mean?

• Red-shift refers to the increase in wavelength of light from an object moving away from the observer, while blue-shift refers to the decrease in wavelength of light from an object moving towards the observer.

• Red-shift refers to the decrease in wavelength of light from an object moving towards the observer, while blue-shift refers to the increase in wavelength of light from an object moving away from the observer.

• Red-shift and blue-shift both refer to the increase in wavelength of light from an object moving away from the observer.

• Red-shift and blue-shift both refer to the decrease in wavelength of light from an object moving towards the observer.

What information can be obtained by studying stellar spectra?

• Chemical composition of stars

• Distance of stars from Earth

• Age of the universe

• Presence of black holes

How does the light from distant galaxies support the idea that the universe is expanding?

• The light is blue-shifted, indicating galaxies are moving closer.

• The light is red-shifted, indicating galaxies are moving away.

• The light remains constant, indicating no movement.

• The light is scattered, indicating random movement.

Describe the changes in the wavelength and frequency of light that is emitted by a galaxy moving toward Earth.

• The wavelength increases and the frequency decreases.

• The wavelength decreases and the frequency increases.

• Both the wavelength and frequency increase.

• Both the wavelength and frequency decrease.

What does it mean if the spectral lines have a greater shift compared to normal?

• The object is moving away at a higher speed.

• The object is moving towards us at a higher speed.

• The object is stationary.

• The object is rotating.

What is the primary purpose of drawing and analyzing stellar spectra diagrams?

• To determine the chemical composition of stars

• To measure the distance of stars from Earth

• To calculate the age of the universe

• To predict future positions of stars

Application Question: Ultraviolet waves emitted by a distant galaxy were changed into radio waves. How was this galaxy moving in relation to Earth? Were these waves red or blue shifted?

• The galaxy was moving towards Earth, and the waves were blue shifted.

• The galaxy was moving away from Earth, and the waves were red shifted.

• The galaxy was stationary relative to Earth, and the waves were not shifted.

• The galaxy was moving in a circular orbit around Earth, and the waves were both red and blue shifted.

Which of the following are pieces of evidence that support the Big Bang Theory?

• Cosmic Microwave Background Radiation and Redshift of Galaxies

• Existence of Black Holes and Dark Matter

• Formation of Stars and Planets

• Presence of Dark Energy and Gravitational Waves

The universe is approximately how many billion years old?

• 10 billion years

• 13.8 billion years

• 20 billion years

• 5 billion years