Answer:
Nil
Explanation:
Sound is a wave whose speed depends on the medium it is traveling in. Sound wave travel faster in water as compared to air. In water the speed of sound wave is around 1480 m/sec whereas in air it is around 343 m/sec.
Since Nil is underwater he will hear the sound of the explosion first. But, the quality of sound will be better for John. This is because humans have evolved to listen in the air and not water. So the sound will not be clear to Nil underwater.
The continent of Antartica is located at the bottom of the world. the South Pole is at its center. Antarctica is the coldest and windiest place on earth. It is covered with ice up to 3 miles thick. Very few plants and animals can survive here, but penguins, fish, and seals live on the coast and in the seas. No people live on Antarctica permanently, but scientists and tourists visit.
They hibernate to a point, they build dens when it gets cold to stay out of the freezing cold but don't sleep all winter
Answer:
Here, 5% of energy wasted as a heat lost or work done against frictional forces.
Explanation:
No engine has yet made that can convert its all input energy into mechanical energy. Some of the input energy goes in vain in the form of heat and friction.
<span><span>Use the periodic table and your knowledge of isotopes to complete these statements.
When polonium-210 emits an alpha particle, the child isotope has an atomic mass of </span><span> ⇒ 206</span>.</span>
<span><span>I-131 undergoes beta-minus decay. The chemical symbol for the new element is </span><span> ⇒ Xe</span>.</span>
<span><span>Fluorine-18 undergoes beta-plus decay. The child isotope has an atomic mass of </span><span> ⇒ 18</span>.</span>
