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AP Physics 1 Unit 8: Fluids: Density, Buoyancy and Continuity — practice questions — page 4

Explore 93 free Unit 8: Fluids: Density, Buoyancy and Continuity questions in AP Physics 1 Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Unit 8: Fluids: Density, Buoyancy and Continuity questions and exercises with answers

Showing questions 91–93 of 93.

Sound is produced by:Read the answer and worked solution →Speed of sound in air is roughly:Read the answer and worked solution →Sound levels above 80 dB sustained for long periods can:Read the answer and worked solution →

Worked practice questions

Sound is produced by:

  1. Stationary objects
  2. Heated objects only
  3. Vibrating objects
  4. Magnetic objects
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Correct answer: C. Vibrating objects

Sound is produced by vibrations of an object — a struck bell, plucked rubber band, vibrating air column in a flute, or the vocal cords in our throat. When the vibration stops, the sound stops.

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Speed of sound in air is roughly:

  1. 340 m/s
  2. 3400 m/s
  3. 34 m/s
  4. Speed of light
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Correct answer: A. 340 m/s

At room temperature, sound travels at about 340 m/s in air. (Exact value depends on temperature — higher at warmer temperatures.) For comparison, speed in steel is ~5000 m/s; in water ~1500 m/s.

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Sound levels above 80 dB sustained for long periods can:

  1. Have no effect
  2. Cause hearing damage and various health problems
  3. Increase concentration
  4. Boost immunity
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Correct answer: B. Cause hearing damage and various health problems

Above 80 dB sustained, sound becomes physically painful and prolonged exposure damages hearing irreversibly — eardrum injury, cochlear hair cell death. **Also:** stress, raised blood pressure, sleep disruption. WHO recommends staying under 70 dB averaged over 24 hours.

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More Physics topics

Unit 1B: Kinematics: 2D Motion & ProjectilesUnit 1C: Kinematics: Relative & Circular MotionUnit 2A: Newton's Laws and Translational EquilibriumUnit 2B: Friction, Gravitational and Normal ForcesUnit 3A: Work and Kinetic Energy TheoremUnit 3B: Potential Energy & Conservation of EnergyUnit 4A: Linear Momentum and ImpulseUnit 4B: Conservation of Linear Momentum & Collisions