2.6 THE UNIVERSE

Question 1

WHAT IS WHITE LIGHT?

Answer 1

A mixture of colours that have different ranges of wavelengths

Question 2

WHAT ARE ABSORBTION LINES?

Answer 2

When white light passes through a gas of an element before passing through a prism, the spectrum produced will have a pattern of dark lines. These dark lines are called absorption lines

Question 3

WHAT COLOUR ARE THE LINES ON AN ABSORBTION SPECTRA?

Answer 3

Black

Question 4

WHAT DO THE LINES ON AN ABSORBTION SPECTRA REPRESENT?

Answer 4

Absorbed specific wavelengths of visible light

Question 5

WHAT IS COSMICAL RED SHIFT?

Answer 5

As the universe expands, it stretches the waves travelling through it, causing the wavelength of the light to increase

Question 6

WHAT IS CMBR?

Answer 6

Cosmic microwave background radiation. These microwaves are what remains of the energy released by the Big Bang. The high energy, short wavelength, gamma rays that were released during the Big Bang have stretched to longer wavelength microwaves as the Universe expanded