🎚️Loudness & Amplitude
🔢What unit is used to measure frequency?
👉Hertz (Hz).
➕What happens when two sound waves reinforce?
👉The sound becomes louder.
📏What does the vertical axis (height) on a wave graph show?
👉Amplitude.
🎸What energy change happens when you pluck a guitar string?
👉Kinetic to sound energy.
💸Why do sounds become quieter the further you are from the source?
👉Energy spreads out and dissipates.
⚡What happens to pitch if an object vibrates faster?
👉Pitch increases.
⚖️What must be the same for two waves to cancel?
👉Amplitude and frequency.
🧮What does the number of waves on the graph per second show?
👉Frequency.
🔔Why do you still hear a sound after hitting a bell once?
👉Vibrations continue using stored energy.
💥Describe what happens to particles in the air when a loud sound occurs.
👉They move a greater distance from their resting position.
🎸Which string on a gayageum makes a higher pitch short or long?
👉Shorter string.
🌀Why don’t sound waves cancel completely in a room?
👉Reflected waves add extra interference.
📢You see high peaks and few waves in 1 second. What sound is that?
👉Loud and low-pitched.
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📈On a graph, how can you tell if a sound is loud or quiet?
👉By the height of the peaks—greater height means louder sound.
👁️You see more waves in 1 second on a graph. What does that mean?
👉Higher frequency and higher pitch.
🔄What is the role of phase in sound cancellation?
👉Waves must be out of phase to cancel each other.
🆙If two waves look the same but one is taller, what’s different?
👉It is louder.
💡Name two other forms of energy sound can come from.
👉Electrical and kinetic.
❓A friend says loud sounds always travel further. Do you agree? Explain why.
👉Not always—loudness decreases over distance due to energy dissipation.
🔉Two sounds have same amplitude but different frequencies. How do they sound?
👉Same loudness, but different pitch.
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🧊Describe the graph difference between whispering and shouting.
👉Whisper = small amplitude; Shout = large amplitude.
🫙A singer's voice shakes a glass. What energy change happened?
👉Sound energy → Vibrational (kinetic) energy of glass.