You have a 40-Hz sound wave and a 5,000-Hz sound wave. Both are traveling
1 answer:
Answer:
Both sound waves will travel at the same speed.
Explanation:
The speed of sound depends only on the density and the elastic properties of the medium it is travelling through, the mathematical relation is
,
where is the bulk modulus<em> (a measure of how much a material will compress under a certain pressure)</em>, and
is the density of the medium.
Since the frequency of a sound wave does not change the properties of the medium it is travelling through, every frequency will have the same speed through a certain medium.
Hence, a 5,000 Hz and a 40-Hz sound wave will have the same speed through steel.
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Answer:
<em>1.01 W/m</em>
Explanation:
diameter of the pipe d = 30 mm = 0.03 m
radius of the pipe r = d/2 = 0.015 m
external air temperature Ta = 20 °C
temperature of pipe wall Tw = 150 °C
convection coefficient at outer tube surface h = 11 W/m^2-K
From the above,<em> we assumed that the pipe wall and the oil are in thermal equilibrium</em>.
area of the pipe per unit length A = =
m^2/m
convectional heat loss Q = Ah(Tw - Ta)
Q = 7.069 x 10^-4 x 11 x (150 - 20)
Q = 7.069 x 10^-4 x 11 x 130 = <em>1.01 W/m</em>