ODU Revision Part 2

ODU Revision Part 2

Open Ended

Name a unit of distance used to measure large distances in space.

Open Ended

Which law is used to estimate the age of the Universe?

Multiple Choice

The Universe is expanding at a decreasing rate.

• True

• False

Open Ended

What do scientists believe is present to allow the increasing expansion of the Universe.

Multiple Choice

When the sound source is moving towards a stationary observer the sign in the Doppler Equation must be

• Positive

• Negative

Open Ended

What are the units for Redshift?

Open Ended

What is the equation use to calculate the recessional velocity of slow moving galaxies?

Open Ended

Write a definition of Time Dilation.

Multiple Choice

The time observed by a stationary observer, when viewing an object moving close to the speed of light, is always

• smaller for the observer

• greater for the observer

Open Ended

Write a definition for Length Contraction

Multiple Choice

The length of an object witnessed by an observer on Earth, for an object moving close to the speed of light, is aways

• greater

• smaller

Open Ended

State one piece of supporting evidence for the Big Bang Theory.

Multiple Choice

What is the temperature for Cosmic Microwave Background Radiation

• 2.73K

• 2.63K

• 2.53K

• 2.43K

Multiple Choice

The mass of the galaxy can be estimated using the orbital speed of stars.

• True

• False

Multiple Choice

Hot objects also emit less energy per unit area at all wavelengths than colder objects.

• True

• False

Open Ended

Name the term given to the wavelength that a star emits more energy than any other.