The sun’s surface has a grainy texture produced by numerous bright markings called _____.

Physics

2 answers:

Schach [20]2 years ago

4 0

<span>the markings are called granules

</span>

just olya [345]2 years ago

4 0

Answer:

Granules

Explanation:

The outer most layer of the Earth is photo-sphere. The photo-sphere layer of the sun is characterized by many bright markings i.e. it has a grainy texture. These are called granules. Granules are produced due to convection currents. The top of the convection cells are visible which give it a grainy texture and is known as granulation.

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Suppose that the sound level of a conversation is initially at an angry 70 db and then drops to a soothing 50 db. assuming that

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Angry sound level = 70 db
Soothing sound level = 50 db
Frequency, f = 500 Hz
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Density (assumed) = 1.21 kg/m^3
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Part (a): Initial sound intensity (angry sound)
10log (I/Io) = Sound level
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Ia/(1*10^-12) = 10^(70/10)
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Part (b): Final sound intensity (soothing sound)
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Is = 10^(50/10)*10^-12 = 18*10^-7 W/m^2

Part (c): Initial sound wave amplitude
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I (W/m^2) = 0.5*A^2*density*velocity*4*π^2*frequency^2

Making A the subject;
A = Sqrt [I/(0.5*density*velocity*4π^2*frequency^2)]

Substituting;
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Part (d): Final sound wave amplitude
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