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Harman [31]
3 years ago
10

What's an easy way to create an interference pattern of waves?

Physics
1 answer:
igor_vitrenko [27]3 years ago
5 0

Answer:

B

Explanation:

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A sound from a source has an intensity of 270 db when it is 1 m from the source. what is the intensity of the sound when it is 3
Lina20 [59]
Sound intensity is inversely proportional to the square of the distance between the source and the receiver.
That is 
I = k/r^2
 where
 k = constant
 r = radius

When r=1,  the intensity is I₁ = k/1 = k
When r=3, the intensity I₂ = k/3² = k/9
Therefore
 I₂ = I₁ /9

In decibels,
I = 10 log₁₀(I/I₀)
where I₀ = reference intensity

When r=1,
10 log₁₀ (I₁/I₀) = 270

When r =3,
10 log₁₀ (I₂/I₀) = 10 log₁₀ [(I₂/I₁)*(I₁/I₀)]
                     = 10 log₁₀ [(1/9)*(I₁/I₀)]
                     = 10 log₁₀(1/9) + 270
                     = 260.5

Answer: 260.5 dB (nearest tenth)
4 0
3 years ago
An athlete runs around a circular track of radius 50 m and finishes at the same point where he began his journey. His total disp
son4ous [18]

Answer:

Explanation:

His displacement is 0 because he ended up exactly where he started.

5 0
3 years ago
Gravity is a <br><br> A.pushing force<br> B. not a force at all<br> C. pulling force
melamori03 [73]

Answer:

C

Explanation:

gravity is a pulling force according to Newton

4 0
3 years ago
How does a rubber rod become negatively charged through friction?
stira [4]
I think it is c I'm only in 7th grade but I'm pretty sure that the answer is c
5 0
4 years ago
Read 2 more answers
Volume of a culinder of length 3.47cm is 1.932cc.find the radius
pashok25 [27]

Answer:

0.421 cm

Explanation:

Volume of a cylinder is:

V = πr²h

where r is the radius and h is the height or length.

Given V = 1.932 cm³ and h = 3.47 cm:

1.932 = πr² (3.47)

0.557 = πr²

r² = 0.177

r = 0.421

The radius is 0.421 cm.

6 0
3 years ago
Read 2 more answers
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