Question
If the de Broglie wavelength of an electron is equal to
that of a proton, what can be concluded about their momenta?Solution
The de Broglie wavelength is given by:
The average mark obtained by 120 candidates in a certain examination is 50. If the average marks of passed candidates are 55 and that of the failed cand...
A batsman scores 87 runs in the 21st match of his career. His average runs per match increases by 2. What was his average before the 21st match.
The average of 7 consecutive odd numbers is 39. What is the smallest of these numbers?
The average monthly salary of 12 employees is ₹45,000. If the salary of one employee is excluded, the average decreases by ₹1,500. What is the salar...
Average weight of a group of ‘x’ people increased by 1.5 kg, when a person weighing 56 kg joined the group while the average weight increased by 2 k...
The average weight of a group of 15 students increases by 1.5 kg when the weight of the teacher is also included. If earlier the average weight of the g...
The average salary of 12 employees in a company is Rs.45,000 per year. When two new employees, Alice and Bob, join the company, their salaries being in ...
There are three numbers 'm', 'n' and 'p' such that average of 'm' and 'n' is 25, average of 'n' and 'p' is 15 and average of 'm' and 'p' is 20. Find the...
There are three numbers 'd', 'e' and 'f' such that average of 'd' and 'e' is 10, average of 'e' and 'f' is 22 and average of 'd' and 'f' is 28. Find the...
The average of 25, 46, and ‘y’ is 28. What is the value of ‘y’?
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