Answer:
Hey
Your answer would be Radioactive Decay and Heat of formation.
When earth first formed it was very violant. Some planetary scientists believe that the moon was created from a collision involving earth and Thea (a theoretical dwarf planet). these collisions that have formed earth heated it so much that it is still hot from them.
Radioactivce decay is another major fource of internal heat for earth.
For those seeking for the answer, its a source of electrical energy.
True is the anwser to your question
Hope this helps
Answer:
Part a)
Part b)
Explanation:
Part a)
Level of sound = 75 dB
now we know that
here we know that
now we have
Part b)
Intensity of sound wave is given as
here we know that
so we have
now we know
now we have
