The value of Planck's constant is:
- A. 6.6262x10-30 J.sec
- B. 6.6262x10-32 J.sec
- C. 6.6262x10+34 J.sec
- D. 6.6262x10-34 J.sec
Explanation
Planck's constant is 6.626 times 10 to the minus 34 joule seconds, and its extreme smallness is why quantisation is invisible in everyday life and only matters at atomic scale. The positive exponent in one option would make it enormous, which a moment's thought rules out. It appears in E equals hf, in the de Broglie relation and in the uncertainty principle.