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.

when the velocity of a mass on a spring is zero, the acceleration is at a maximum .

answer: d. a cme increases the amount of energy in the solar wind

explanation:

coronal mass ejections, also called cmes, are large clouds of plasma and magnetic field that erupt from the sun. only when the cloud is aimed at earth will the cme hit earth and therefore cause impacts. high-speed solar wind streams come from areas on the sun known as coronal holes.