The section of a longitudinal wave in which the particles are densely packed together
1 answer:
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Answer:
3%
Explanation:
The total energy ingested is 3000J and of those 3000J, 100J are used for growth and reproduction, this is the part of production in the porcupine, since the other 800J and 2100J are used for internal processes of the porcupine.
Therefore the production efficiency is 100J of the 3000J, let's find out how much it is in percentage:
⇒0.033=3.3% ≈ 3%
The correct option es 3% of production efficiency.
Answer:
far from the speaker the intensity drops to 85 dB.
Explanation:
In the equation for the Decibel scale
The ratio of the intensities can be written as
And since
and
,
meaning
Putting this into equation (1), we get:
Now, if the intensity is 100 dB when the distance is 5 meters, we have:
by taking both sides to the exponent:
Now equation (2) becomes
when the intensity level is 85 dB we have
take both sides to exponents and we get:
Thus, far from the speaker the intensity drops to 85 dB.