Answer:
7 × 10^-1
Explanation:
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Answer: Option (b) is the correct answer.
Explanation:
It is known that when a ray of light tends to travel from a denser to rarer medium then there occurs total internal reflection.
For a denser medium the refractive index is greater than that of a rarer medium. This means that for the given situation refractive index of medium 
is greater than medium 
.
this also means that incident angle must be greater than the critical angle of the medium.
Thus, we can conclude that the statement > must be true for total internal reflection to occur.
The medium through which sound travels inside a bird’s body is the air. This is further explained below.
<h3>What is Air?</h3>
Generally, Air is simply defined as the invisible combination of gases, and this gas exists around the Earth.
In conclusion, Sound wave allows birds to communicate.
Read more about sound
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W=MG
w is weight
m is mass
g is gravity
W=(100 kg)(9.8 m/s)
W= 980 N
hope this helps
First one heat, the second one is radiation and the third is radiated ;)
