What is most likely true of an atom with a mass of 15 amu?
a) there are 15 protons.
b)there are 15 electrons.
c)the total number of protons and electrons is 15.
d)the total number of protons and neutrons is 15.

The total number of protons and neutrons is 15, most likely true of an atom with a mass of 15 amu.

Option D

Explanation:

The Atomic Mass of an atom is defined with its unit amu (atomic mass unit). Here, the atomic mass is given as 15 amu. We all know that,

        Atomic mass= Number of (Protons + Neutrons)  

The number of protons and electrons are equal in an atom of an element. Besides, For ex, if we follow, the atomic mass chart of elements, we can see that Nitrogen has the atomic mass number 15 amu.

They are having 7 protons, 7 electrons and 8 (more than 7) neutrons in the atom. Hence, we can easily justify the answer with the option (D).

when jerome paddle in flowing river towards east the net speed of jerome will increase

so the net speed of jerome will be given as

now the speed of paul will be same as it is given as he is running on the ground

so

so here we can say since the speed of jerome is more so he will win the race

now as we know the distance so the time difference is given as

so jerome will reach first and the time difference will be 203.55 s or 3.4 min