💯 An Ultimate Guide to Sound Volume vs Intensity | Sound Loudness and Intensity (Questions)

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Timeline:
0:00 Intro
0:10 Question 11 Comparison of Volumes 40 dB vs 20 dB
1:19 Question 12 Match the Volumes to the Sound Sources
2:28 Question 13 Calculating the Volume of a Sound
3:30 Question 14 By what factor is its amplitude greater?
4:35 Question 15 Does a sound with a higher volume always sound louder to us?
0:10 Question 16 Increasing volume corresponds to decibels

Question 11

How does the volume of a 40 dB sound compare to that of a 20 dB sound?

(A) It is twice as loud.
(B) It is ten times as loud.
(C) It is twenty times as loud.
(D) It is one hundred times as loud. ←

Decibels work on a logarithmic scale, and each increase of 10 dB corresponds to a sound ten times louder.

Question 12

Match the volumes to the sound sources.

Vacuum cleaner (at 1 m) - 70 dB
Jackhammer (at 1 m) - 100 dB
Normal conversation (at 1 m) - 60 dB
Freight train (at 15 m) - 80 dB

Question 13

Calculate the volume of a sound that is:

(a) ten times louder than a 24 dB sound.

A change of ten decibels corresponds to a tenfold increase in volume, so 24 + 10 = 34 dB ↙

(b) ten times softer than a 9 dB sound.

9 - 10 = -1 dB (This is below the limit of human hearing)

Question 14

A specific 800 Hz sound is eight times louder than another 800 Hz sound. By what factor is its amplitude greater?

If it is eight times louder, its amplitude must be a square root of 8 times more significant. The amplitude is 2.83 times greater. ↙

Question 15

Does a sound with a higher volume always sound louder to us?

No, it does not because the human ear has different sensitivities for different frequencies. Our ears are most sensitive to the frequencies of ordinary conversation, so sounds of these frequencies will seem louder than other sounds with the same volume. Sounds with very high or very low frequencies will be inaudible regardless of their volume. ↙