Answer:
a) ΔФ = 5.54 rad
, b) f = 140 Hz
Explanation:
a) This is a sound interference exercise, which is described by
Δr /λ = ΔФ / 2π
ΔФ = Δr 2π /λ
Let's find the path difference
Δr = r₂ -r₁
r₁ = 4m
r₂ = √ (x² + y²) = √(3² + 4²) = 5 m
Δr = 1 m
To find the wavelength we use the relation of the speed of sound
v = λ f
λ = v / f
λ = 340/300
λ = 1,133 m
We substitute
ΔФ = 2π 1 /1.133
ΔФ = 5.54 rad
b) to have a minimum intensity the phase difference must be π radians
λ = Δr 2π /Ф
λ = 1 2π /π
λ = 2m
We look for the frequency
v = λ f
f = v /λ
f = 340/2
f = 140 Hz
Answer:
A.
Explanation:
Because you are working in the buisnes, you can make a good impression by paying the exact amount or more in taxes.
Compounds:
hydrogen
methane
hydrochloric acid
mixtures:
salt and water
oil and water
sugar and hot water
(stuff in day to day life basically)
These two forces are called action and reaction forces and are the subject of Newton's third law of motion.
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