number of neutrons for hydrogen

A sequence of numbers is said to form a harmonic progression if their reciprocals form an arithmetic progressio..

If three quantities are in harmonic progression, then the middle quantity is called the harmonic mean between the other two. Example: 1/3, 1/7, 1/11 are in H.P., then 1/7 is the middle term. Hence 1/7 is the harmonic mean between 1/3 and 1/1..

If three quantities are in harmonic progression, then the middle quantity is called the harmonic mean between the other tw..

Question: Define an odd number. Answer: A number when divided by 2 gives remainder 1 is called an odd number..

Assume the validity of the result for n equal to some arbitrary but fixed natural number, say, ..

Question: List the elements of the following sets and specify whether they are finite or infinite: Answer: (i) Since there is no natural number lying between 2 and 3, the set is a null set i.e. f . This is a finite set. (i) Since there are infinite numb..

Factorise 5x 2 - 9x - 1..

Using matrix method, solve the following system of linear equations x + y + z = 6 (1) x + 2y + 3z = 14 (2) x + 4y + 7z = 30 ..

If x:y=3:4 find value of (4x+3y) : (2x+5y..

Divide x 2 + 3x -4 by (x-1), ..