Spectra

Question 1

Name the types of spectra

Answer 1

Emission

Absorption

Question 2

Name the two forms of spectra

Answer 2

Continuous

Line

Question 3

How is a line absorption spectra formed?

Answer 3

Each line represents a frequency of light photon which is absorbed after being passed through gas.
Any photons of light with the same frequency as the photons emitted to produce the emission spectrum are absorbed

Question 4

How is a line emission spectra formed?

Answer 4

A line spectrum is emitted when by excited atoms in a low pressure gas

Question 5

How can elements be defined?

Answer 5

Each element has its own line spectra

Question 6

Describe an energy level diagram in terms of energy

Answer 6

Movement from top to bottom produces energy

Movement from bottom to top absorbed energy

Question 7

Describe frequencies in energy level diagrams

Answer 7

Larger the energy change, the larger the frequency

Question 8

What happens to the electron when it reaches the top of an energy level diagram?

Answer 8

It is ionised

Question 9

How do electrons move between energy levels?

Answer 9

By absorbing or emitted a photon with the right amount of energy to match the gap between the energy level

Question 10

What is the visible continuous spectrum?

Answer 10

Consists of all wavelengths of visible light from violet at 410nm to red at 656nm

Question 11

What are Fraunhofer lines?

Answer 11

The dark lines on an absorption spectrum of sunlight having passed through the outer layers of the suns atmosphere that correspond to the frequencies absorbed

Question 12

What is the relationship between irradiance and distance?

Answer 12

Irradiance x distance = a constant