It would be the second option - <span>
It should be made of a material that will not undergo fission.</span>
<span>The most important characteristic of a control rod is that it should be made of a material that will not undergo fission and be a good absorber of neutrons</span>
Answer: 35 degree Celsius
Explanation: Subtract both the temperatures And divide by two.
Answer : distance, d = 463.7 m
Explanation :
According to the given condition it can be assumed that the first echo would be heard from closest cliff. The second echo is from farther cliff and the third echo is from the reflection between the two cliffs.
Let the distance between the first cliff and the point of firing is x and y is the distance between the second cliff and the point of firing.
Then the first echo will travel 2x distance, second will travel 2y distance and third will travel 2x +2y.
So, using above data :
and
On solving :
x = 321.9 m and y = 141.8 m
Hence, total distance between two cliffs is d = 321.9 m + 141.8 m = 463.7 m