Question

Oxygen exists in three isotopes that is O^15, O^16, O^18. If 15% by mass of wxygen 15, 80% of 16 and rest is of oxygen 18. In a mixture of 500g. Then calculate molar mass of oxygen.

Answer 1

The uncertainity of a moving bullet of mass 10g is 10^-5 m. Calculate the uncertainity in its velocity?

According to uncertainty principle

Δx.Δmv = ℎ / 4π

Δv = ℎ 4πmΔ

x=6.626 × 10−34 / 4×3

=> ×14×10−2×10−5

=> 5.27×10−28 m/s ...