Vibrations and Sound Revision

Vibrations and Sound Revision

1. The Wave Nature of Sound

Multiple Choice

Sound waves need a medium to vibrate through. These types of waves are called...

• Mechanical Waves

• Electromagnetic Waves

Multiple Choice

Sound waves can undergo all the following wave phenomena except one. Which one is it?

• Reflection

• Refraction

• Interference

• Polarisation

• Diffraction

Open Ended

Why does light not diffract when passing through a doorway but sound does?

Multiple Choice

The sound from the speakers is loud but as the person continues walking it becomes silent due to ______________.

• Constructive interference

• Destructive interference

Multiple Choice

As the person continues walking the sound goes from quiet to loud again, this is due to ______________.

• Constructive interference

• Destructive interference

Multiple Choice

True or False: Sound Travels faster in denser mediums?

• True

• False

2. Characteristics of Notes

Multiple Select

Musical Notes Have 3 Main Characteristics, What Are They?

• Pitch

• Loudness

• Tone

• Quality

• Depth

Loudness

• Depends on the amplitude of the sound wave

• If the amplitude is increased, the loudness of the sound increases.

Multiple Choice

Which number represents the amplitude of the wave in the diagram?

• 1

• 2

• 3

• 4

Pitch

• Depends on the frequency of the sound wave.

• As the frequency increases, the pitch of the sound becomes higher.

Multiple Choice

Which wave has the lowest pitch?

• Wave 1

• Wave 2

• Wave 3

• Wave 4

Multiple Choice

Which wave has the highest pitch?

• Wave 1

• Wave 2

• Wave 3

• Wave 4

Multiple Choice

Which wave is louder? Wave 1 or Wave 2?

• Wave 1

• Wave 2

Multiple Choice

True or False: Wave 1 and Wave 2 have the same pitch?

• True

• False

Quality

• Depends on the number of overtones and the relative strength of those overtones.

Open Ended

What are the frequency limits of audibility?

3. Resonance

Natural Frequency

• Natural Frequency is the frequency an object will vibrate at if free to do so

Multiple Choice

What is resonance?

• The transfer of energy so that a body vibrates at its natural frequency

• The removal of energy from a wave to another wave

• Constructive interference of waves

4. Vibrations in Strings and Pipes

Multiple Choice

The distance between two consecutive nodes in a standing wave is _____________.

• One full wavelength

• Half a wavelength

• A quarter of a wavelength

• A third of a wavelength

Multiple Choice

The distance between a node and an antinode in a standing wave is _____________.

• One full wavelength

• Half a wavelength

• A quarter of a wavelength

• A third of a wavelength

Fundamental Frequency of a Stretched String

A string vibrating with an antinode in the centre and a node at each end (with no additional nodes or antinodes present) is vibrating at its fundamental frequency

Fundamental Frequency (First Harmonic)

First Overtone (Second Harmonic)



Second Overtone (Third Harmonic)

Relationship Between Frequency (f) and Length (L)