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Arisa [49]
2 years ago
15

A boy walked 4m east then 3m south find the displacement

Physics
1 answer:
Solnce55 [7]2 years ago
3 0

Answer:

5m

Explanation:

4^{2}+3^{2}=5^{2}\\5^{2}=25

Use the Pythagorean theorem to calculate the long edge of the triangle, which would be his displacement.

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Suppose that the sound level of a conversation is initially at an angry 71 dB and then drops to a soothing 54 dB. Assuming that
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Answer:

Explanation:

In the decibel scale , intensity of sound changes logarithmically as follows

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Putting the values

10log\frac{I}{10^{-12}} = 71

log\frac{I}{10^{-12}} = 7.1

\frac{I}{10^{-12}} = 10^{7.1}

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Similarly for 54 dB sound intensity can be given as follows

I = 10⁻¹² x 10^{5.4}

I= 10^{-6.6 } W / m²

For intensity of sound the relation is as follows

I = 2π²υ²A²ρc where υ is frequency , A is amplitude , ρ is density of air and c is velocity of sound .

Putting the given values for 71 dB

I= 10^{-4.9}  = 2π² x 504²xA²x 1.21 x  346

A² = 60.03 x 10⁻¹⁶

A = 7.74 x 10⁻⁸ m

For 54 dB sound

10^{-6.6} = 2π² x 504²xA²x 1.21 x  346

A² = 1.1978 x 10⁻¹⁶

A = 1.1 x 10⁻⁸ m

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3 years ago
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