Light (T1)

Question 1

What is the modern view of light?

Answer 1

Light has a dual nature.

Light may behave as wave.

Light may behave as a stream of particles called quanta or photons.

Question 2

Describe spectroscopy..

Answer 2

• spectral lines represent energy released as an electron returns to a lower energy state
• spectral lines identify an element
• it is called the bright line spectrum of an element

Question 3

What is the particle description of light?

Answer 3

Energy exists as particles called quanta.

E = hf