This question is incomplete, the complete question is;
When an auditorium has a solid wall, sound waves will tend to perfectly reflect off the wall (i.e. with a 180o phase change). If listening to music, as from an orchestra, the incoming and reflected waves will interfere with each other. For a listener sitting 0.5 m from the wall, what is the lowest frequency which gets suppressed by this interference? Use vsound=330 m/s.
Answer: f = 165 Hz
the lowest frequency which gets suppressed by this interference is 165 Hz
Explanation:
For a reflected wave (out of phase), the path difference between the incoming and reflected wave should be equal to the half integral multiple of wavelength.
r₂ - r₁ = ( m + 1/2) λ/2
r₂ is the distance from the source to observer via reflection
r₁ is distance from source to observer
here r₂ would travel an additional distance of 0.5 m due to reflection that straight approaching wave.
Therefor to have minimum/lowest possible frequency, we say m = 0
we substitute
0.5 = ( 0 + 1/2 ) λ/2
λ = 2m
The frequency would be
f = Vsound / λ
f = 330 / 2
f = 165 Hz
Therefore the lowest frequency which gets suppressed by this interference is 165 Hz
Answer:
38.1 N
Explanation:
The electrostatic force between two charged objects is given by:
where
k is the Coulomb's constant
q1 and q2 are the two charges
r is the separation between the two objects
In this problem, we have
so, the electrostatic force is
Answer:
The rule to remember is that opposites attract. Every magnet has both a north and a south pole. When you place like poles of two magnets near each other (north to north or south to south), they will repel each other.
Explanation:
Answer:
Igneous rock , formed by the cooling of magma (molten rock) inside the Earth or on the surface. Sedimentary rocks, formed from the products of weathering by cementation or precipitation on the Earth's surface. Metamorphic rocks, formed by temperature and pressure changes inside the Earth.
Explanation:
The information was found on:
https://msnucleus.org/membership/html/k-6/rc/rocks/3/rcr3_1a.html
Answer:
what are the answer choices
Explanation:
i dont know the choices so i say count the stuff they recycle, and add the score to the days before.