Paheli while moving in a forest observed that there was no noise pollution, though lots of heavy vehicles were passing from the nearby highway. Explain.

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Solution

Paheli observed that there was no noise pollution in a forest even though there were lots of heavy vehicles passing from the nearby highway. It is because trees present in the forest absorb the noise.

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Question 11

Paheli while moving in a forest observed that there was no noise pollution, though lots of heavy vehicles were passing from the nearby highway. Explain why?

It was observed that $150$ vehicles crossed a particular location of a highway in a duration of $30$ minutes. Assuming that vehicle arrival follows a negative exponential distribution, find out the number of times headway is greater than $5$ seconds in the above observation ?

❉ These are the sounds of single vehicles. How does it sound when many vehicles run together on the road making different noises ? Isn't there a lot of noise ?

❉ Where have you heard the maximum noise ?

❉ Do you like so much noise ? Why?

Q. Last year, for every

100

million vehicles that traveled on a certain highway,

96

vehicles were involved in accidents. If

3

billion vehicles traveled on the highway last year, how many of those vehicles were involved in accidents? (

1

billion

= 1, 000, 000, 000

)

Q. To reduce noise pollution, which of the following devices must be installed on the vehicles ?

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