Answer:
342 m/s
Explanation:
The velocity of sound in air is approximated as:
v ≈ 331.4 + 0.6 T
where v is the velocity in m/s and T is the temperature in Celsius.
At T = 18:
v ≈ 331.4 + 0.6 (18)
v ≈ 342.2
The velocity is approximately 342 m/s.
The velocity of a sound wave traveling through air at a temperature of 18°C (64.4°F) is 343m/s.
Explanation :
At normal atmosphere and pressure, the velocity of sound wave at increase in temperature is as follows
[tex]\mathrm{V}=331 \mathrm{m} / \mathrm{s}+(0.6 \mathrm{m} / \mathrm{s} / \mathrm{c})^{*} \mathrm{T}[/tex]
where T is the temperature in degrees Celsius.
Using this equation, calculate the velocity of a sound wave at 20 degrees Celsius , from the following equations,
[tex]\mathrm{V}=331 \mathrm{m} / \mathrm{s}+(0.6 \mathrm{m} / \mathrm{s} / \mathrm{c})^{*} \mathrm{T}[/tex]
[tex]\mathrm{v}=331+(0.6)^{*} 20[/tex]
[tex]\mathrm{v}=331+12[/tex]
V = 343 m/s
