Why is the central maximum the color of the discharge tube?

Which of the statements about waves is true? a. in longitudinal waves, particles move perpendicular to the direction the wave is traveling. b. both transverse and longitudinal waves can travel through water c. electromagnetic waves are a type of longitudinal waves. d. in a transverse wave, particles move parallel to the direction the wave is traveling.

When an object is heated it contracts. a. true b. false

Aball horizontally thrown from a cliff at 8m/s