Answer:B
Explanation:
Option A:
In the nuclear reactions,neutron can be split into proton an electron.
In this case,the number of protons are increasing,increasing the atomic number.
Hence,the atomic number is not conserved.
Option B:
In any reaction the sum of number of neutrons and number of protons remain constant before and after the reaction.
Option C:
The mass number may change for the atoms.For example 
emission reduces the atomic number by 
Option D:
In the nuclear reactions,neutron can be split into proton an electron.
So,they number of neutrons may change.
In the helium atom, the strong force is a fundamental interaction between the "<span>(4) neutrons and protons" and it should be noted that this is the case for most atoms. </span>
At the top, due to the fact that POTENTIAL energy is Stored energy.
Answer:
345 K
Explanation:
Temperature can be defined as a measure of the degree of coldness or hotness of a physical object.
Generally, it is measured with a thermometer and its units are Celsius (°C), Kelvin (K) and Fahrenheit (°F).
<u>Given the following data;</u>
<em>To convert the temperature in degree Celsius to Kelvin, we would use the following mathematical expression;</em>
Kelvin = 273 + °C
Substituting into the formula, we have;
Kelvin = 273 + 72
<em>Kelvin = 345 K</em>
<em>Therefore, the temperature of 72°C will be equivalent to 345 K on the Kelvin scale.</em>
<span>both the speed of the wave and the wavelength
- The frequency does not change, but the speed does. If that is true, then the wavelength must also change.</span>
