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Sound Properties

Dog is barkin...

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Dog is barking at a rate 4π μ watt.Sound level at a point at a dis†an ce 10 m from the dog is

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Q. A dog while barking delivers about 1 mW of power. Assume this power is uniformly distributed over a hemispherical area. Now, 5 dogs start barking at the same time from the same point, each delivering 1 mW of power. What would be the sound level at a distance of 5m? (Take,

l o g_{10} (6.37) = 0.8

l o g_{10} 5 = 0.7

)

Q. Write the converse and contrapositive of the statement
"If a dog is barking,then it will not bite"

(i)

Converse of the statement:If a dog will bite then the dog is barking.

(i i)

Contrapositive of the statement:If a dog will bite then the dog is not barking.

Q. Fill in the blank with an appropriate word:
The dog was hiding _________ the bed, barking at the stranger.

Q. Principle : There are legal provisions to give authority to a person to use necessary force against as assailant or wrong doer for the purpose of protecting one's own body and property when immediate aid from the state machinery is not readily available; and in so doing he is not answerable in law for his deeds.
Facts : X, a rich man was taking his morning walk. Due to the threat of robbers in the locality, he was carrying his pistol also. From the opposite direction, another person was coming with a ferocious looking dog. All of a sudden, the dog which was on a chain held by the owner, started barking at X. The owner of the dog called the dog to be calm.
They crossed each other without any problem. But suddenly, the dog started barking again from a distance. X immediately took out his pistol. By seeing his pistol the dog stopped barking and started walking with the owner. However X shot at the dog which died instantly. The owner of the dog files a complaint against X, which in due course reached the Magistrate Court. X plead the right of private defence.
Decide

A stray dog senses a sound of frequency 20 Hz, and starts barking towards the direction of sound. How true the given situation is?

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