Question

when lisa practices the trumpet, she notices that the windows in her room vibrate. what causes this to happen?
a) energy carried by a transverse wave is transformed to elastic energy.
b) energy carried by a transverse wave is transformed to radiant energy.
c) energy carried by a longitudinal wave is transformed to kinetic energy.
d) energy carried by a longitudinal wave is transformed to chemical energy.

Explanation:

• Sound is a longitudinal wave. When Lisa plays the trumpet, sound (longitudinal wave) is produced.
• The vibrating windows have kinetic energy (energy of motion due to vibration). So the energy carried by the longitudinal wave (sound) is transformed to kinetic energy of the windows.
• Transverse waves (like light - a transverse electromagnetic wave) are not relevant here as sound is longitudinal. Elastic energy is related to deformation (like a spring being stretched/compressed, not the case here). Radiant energy is light - related. Chemical energy is related to chemical reactions (not relevant to this wave - window vibration scenario).

Answer:

C. Energy carried by a longitudinal wave is transformed to kinetic energy.