Which one statement below is true? select one: o a. when an em wave enters a new medium, its wavelength stays the same and its frequency changes. o b. light travels more slowly in glass than in air. o c. the electric and magnetic fields oscillate at different frequencies in an em wave o d. dispersion only occurs for the visible range of the em spectrum.

Option b. is true

Explanation:

Other options are not correct like

When an electromagnetic wave enters a new medium it speed as well as wavelength changes but frequency does not change.

the temperature and the pressure affect solubility. temperature affects by changing the properties of the solvent. the increase in pressure increases solubility, the decrease in pressure decreases solubility.