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15 Questions

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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?

Pascal (Pa) Signup and view all the answers

What does SPL stand for in the context of sound?

Sound Pressure Level Signup and view all the answers

Why is Sound Pressure Level measured using a logarithmic scale?

Because the ear works logarithmically Signup and view all the answers

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

20 to 20000 Hertz Signup and view all the answers

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

Pitch Signup and view all the answers

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

a = A * sin((2Π * f * t) + φ) Signup and view all the answers

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

Pure tone 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?

Frequency Signup and view all the answers

What phenomenon is explained by differences in sound frequency?

Doppler effect Signup and view all the answers

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

-3 dB Signup and view all the answers

'Timbre' in relation to sound refers to:

'The color or quality of sound' Signup and view all the answers

'SPL' in relation to sound stands for:

'Sound Pressure Level' Signup and view all the answers