What I know 1. Which of the following produce sound? A. soft objects B. radio stations C. vibrating objects D. objects under pressure 2. Which of the following would be most likely to transmit sound the best? A. steel in a cabinet B. water in the ocean C. air in your classroom D. water in a swimming pool 3. Resonance occurs when _____. A. someone pushes an object. B. you vibrate an object. C. somebody hits an object with a hammer. D. you have applied force to a system to vibrate at its natural frequency
The Correct Answer and Explanation is:
Let’s go through each question one by one:
1. Which of the following produce sound?
The correct answer is C. vibrating objects.
Sound is produced when an object vibrates, creating pressure waves in the surrounding medium (like air, water, or solids). These vibrations cause particles to compress and decompress, transmitting sound waves. While soft objects, radio stations, and objects under pressure can influence sound in various ways, they are not the direct cause of sound production. Sound is a direct result of vibration.
2. Which of the following would be most likely to transmit sound the best?
The correct answer is A. steel in a cabinet.
Sound travels best through solid materials, especially metals like steel. This is because sound waves can travel more efficiently in dense, rigid media, where the particles are closely packed and can transmit vibrations quickly. Water, while it can transmit sound, does so less efficiently than solids. Air is the least effective medium for sound transmission because its particles are farther apart compared to solids and liquids, leading to slower transmission.
3. Resonance occurs when _________________.
The correct answer is D. you have applied force to a system to vibrate at its natural frequency.
Resonance happens when a system is forced to vibrate at its natural frequency by an external force. When this happens, the system can vibrate with a larger amplitude, because the energy input aligns with the system’s natural oscillations. This is why musical instruments are designed to resonate at certain frequencies, producing louder sounds. For example, when a singer hits the exact pitch that matches the natural frequency of a glass, the glass may vibrate intensely or even break.
