Radiation and Spectra

Question 1

The energy associated with a single photon is given by

Answer 1

E=hf or E=hc/λ

Question 2

The energy associated with one mole of photons is given by

Answer 2

E=Lhf or E=Lhc/λ

Question 3

Electromagnetic radiation is said to have a ____nature

Answer 3

dual

Question 4

E and f are

Answer 4

proportional (E=f)

Question 5

When energy is transferred to atoms, electrons within the atoms may be

Answer 5

promoted to higher energy levels

Question 6

An atom emits a photon of light energy when

Answer 6

an excited electron moves from a higher energy level to a lower energy level

Question 7

Describe emission spectroscopy

Answer 7

High temperatures are used to excite the electrons within atoms. As the electrons drop to lower energy levels, photons are emitted at different wavelengths.

Question 8

Describe absorption spectroscopy

Answer 8

Electromagnetic radiation is directed at an atomised sample. radiation is absorbed as electrons are promoted to higher energy levels.

Question 9

In atomic spectroscopy the concentration of an element within a sample is

Answer 9

related to the intensity of light absorbed