Week 2 Part 1: Understanding Sound

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Questions and Answers

What is sound?

  • Chemical energy
  • Acoustic energy in the form of a mechanical wave (correct)
  • Electromagnetic energy
  • Potential energy

How is air pressure measured?

  • Kelvin
  • Lumen
  • Atmospheres, pascals, milibars, mmHg (correct)
  • Meters per second

Why does sound travel faster in water than in air?

  • Lower elasticity of water
  • Presence of more air particles in water
  • Higher density of water molecules
  • Due to shorter wavelengths in water allowing easier travel around objects (correct)

What is the SI unit for sound pressure?

<p>Pascal (Pa) (B)</p> Signup and view all the answers

What does SPL stand for in the context of sound?

<p>Sound Pressure Level (A)</p> Signup and view all the answers

Why is Sound Pressure Level measured using a logarithmic scale?

<p>Because the ear works logarithmically (C)</p> Signup and view all the answers

Which of the following correctly describes the range of human hearing?

<p>20 to 20000 Hertz (B)</p> Signup and view all the answers

What is the term used to describe the prominent frequency at which repetitions occur in a sound?

<p>Pitch (D)</p> Signup and view all the answers

What is the equation to calculate the amplitude of a sinusoid at a given time?

<p>a = A * sin((2Π * f * t) + φ) (D)</p> Signup and view all the answers

What type of sound is characterized by all the energy being at one frequency?

<p>Pure tone (A)</p> Signup and view all the answers

What characteristic can be used to express the tone of a sound, characterized by the number of cycles in a given time?

<p>Frequency (D)</p> Signup and view all the answers

What phenomenon is explained by differences in sound frequency?

<p>Doppler effect (C)</p> Signup and view all the answers

What is the threshold of human hearing typically represented as in decibels?

<p>-3 dB (D)</p> Signup and view all the answers

'Timbre' in relation to sound refers to:

<p>'The color or quality of sound' (B)</p> Signup and view all the answers

'SPL' in relation to sound stands for:

<p>'Sound Pressure Level' (B)</p> Signup and view all the answers

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