Vibrations And Sound

Question 1

The fundamental frequency of a string

Answer 1

A string vibrating with an antinode at its centre and a node at each end (and no other nodes or antinode)

Question 2

Overtones

Answer 2

Frequencies which are multiples of the fundamental frequency

Question 3

Resonance

Answer 3

Transfer of energy between two bodies with the same or similar natural frequency

Question 4

Loudness

Answer 4

Depends on the amplitude and frequency of the soundwave

Question 5

Pitch

Answer 5

Depends on the frequency of the soundwave

Question 6

Quality

Answer 6

Depends on the number of overtones present in the note and the relative strengths of the different overtones present

Question 7

Frequency limits of audibility

Answer 7

The highest and lowest frequencies that can be heard by a normal human ear i.e. 20 Hz to 20,000 Hz

Question 8

Sound intensity

Answer 8

The energy per second per unit area

Question 9

Equation for sound intensity

Answer 9

Power over area

Question 10

Unit of sound intensity

Answer 10

Watt per square metre (WM -2)

Question 11

Threshold of hearing

Answer 11

The smallest intensity that an be heard by the human ear

Question 12

Unit for sound intensity LEVEL

Answer 12

Decibels (dB)

Question 13

Sound

Answer 13

Mechanical wave that is produced by vibrating objects and needs a medium to travel through

Question 14

Sound intensity level formula

Answer 14

Sound intensity x2 = sound intensity level +3