Page 19 - Final Science BB Prep2 Part one (2nd term) 2024-2025_Neat

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Science Prep.2

Sound Intensity = Sound Intensity = G.R: Sound G.R: Sound ……………….
intensity intensity in

increases when case of CO2
G.R: The sound G.R: When the the sound
gas medium
intensity increases 4 amplitude source touches is higher
times when the increases 2 times as resonance
distance between the than that of
the sound intensity. air
sound source and the
intensity increases Bec. The
ear decreases to its half Due to the
4 times density of
value increase in the
Because sound vibrating CO2 is more
because sound intensity
intensity directly surface area than that of
inversely proportional
proportional to air and
to the square distance
between the sound the square sound
source and the human amplitude. intensity
ear directly

proportional
to the
density of
the medium

3-Sound quality

(type):

It is the property by which the ears can distinguish between different sounds

according to the nature of the source even if they are equal in intensity and

pitch.

From the figure:

-Fundamental tone: It is pure and simple tone produced from a vibrating tuning fork

-Harmonic tones: They are tones that accompany the fundamental (basic) tone but they are
lower in intensity and higher in pitch and differ from one instrument to another.
-Complex tone: composed of fundamental tone associated by harmonic tones that differ in

Low in intensity and high pitch.

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