Light and Emission Spectra

Line emission spectrum shown below happens when

• Electron transition from lower to higher energy level.

• Electron transition from higher to lower energy level.

• Electron exist in fixed energy states

• Electron transition between different energy levels.

Tags

NGSS.HS-PS4-3

Emission of light from an atom occurs when an electron

• drops from a higher to a lower energy level.

•    jumps from a lower to a higher energy level.   

•    moves within its atomic orbital.

• falls into the nucleus.

Tags

NGSS.HS-PS1-2

NGSS.HS-PS4-3

Why are line emission spectra of elements called "atomic fingerprints"?

• They are all the same

• They are all unique

• They are all similar

• They all contain colored light

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

All stars are composed of a mixture of elements. When these elements are heated they emit specific amounts of electromagnetic radiation, known as an emission spectrum. Each element emits a unique, identifiable, spectrum. Using the Bright-line emission spectrum chart below, identify the elements present in this modeled star (found in the line labeled “mixture”).

• Lithium and cadmium are in the mixture. Strontium is not in the mixture.

• Lithium and strontium are in the mixture. Cadmium is not in the mixture

• Cadmium and strontium are in the mixture. Lithium is not in the mixture

• All of the shown elements are present in the mixture.

Tags

NGSS.HS-ESS1-3

Identify each part of the electromagnetic spectrum:

d

e

f

g

a

b

c

Ultraviolet

Gamma ray

X-ray

Radio wave

Infrared

Microwave

Visible light

Tags

NGSS.HS-PS4-1

Which "item" represents the electromagnetic radiation with the lowest energy:

Tags

NGSS.HS-PS4-3

NGSS.HS-PS4-4

Which "item" represents gamma rays:

Tags

NGSS.MS-PS4-1

NGSS.MS-PS4-2

Which "item" represents the electromagnetic radiation with the highest energy:

Tags

NGSS.HS-PS4-1

NGSS.HS-PS4-3

NGSS.HS-PS4-4

Which "item" represents ultraviolet radiation:

Tags

NGSS.HS-PS4-1

NGSS.HS-PS4-3

NGSS.HS-PS4-4

The unknown emissions spectra belongs to the element

• Hydrogen

• Mercury

• Neon

• Sodium

Tags

NGSS.HS-PS4-3