Answer: Δβ = 28.5278 dB
Explanation:
from the question we are given that;
the sound gathering area Ga = 15.0 cm²
total area Ae = 0.800 cm²
efficiency ε = 38 %
therefore we have that the effective gathering area of the stethoscope is;
As = ε Ga
As = 38 % × 15 = 5.7 cm²
But I ∝ 1/A
where Ie/Is = As/Ae
Ie/Is = 5.7/0.800 = 7.125
given that we are to assume that sound is transmitted into a stethoscope 100 times, this gives
I'e/I's = Ie/Is × 100 = 7.125 × 100 = 712.5
Δβ = βe - βs = (10dB) log (I'e/Io) - (10dB) log (I's/Io)
Δβ = (10dB) log (I'e/I's)
Δβ = (10dB) log (712.5) = 28.5278
Δβ = 28.5278 dB
cheers i hope this helps
Of the examples listed, and given the definition of patternicity, we can say that the best example is that of the Constellations. Option A is correct.
Patternicity is a tendency displayed by most humans. It is the tendency to perceive patterns and relate them to otherwise unrelated objects. Some examples of this that are seen commonly are:
- Constellations
- Seeing figures in clouds
- Comparing birthmark shapes to everyday objects
Constellations are groups of stars that we perceive to form a pattern or figure of some kind. There are many constellations and although they have served navigational purposes among others throughout the years, their very existence is an example of patternicity given that each star is individual and has no relation to one another nor the figures we perceive them to form.
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Answer:
The tonsils are part of the body's immune system. Because of their location at the throat and palate, they can stop germs entering the body through the mouth or the nose. The tonsils also contain a lot of white blood cells, which are responsible for killing germs.
Explanation:
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