Planck's constant has the value
Correct answer: A. 6.63 times 10 to the minus 34 J s
- A. 6.63 times 10 to the minus 34 J s
- B. 3.0 times 10 to the 8 J s
- C. 1.6 times 10 to the minus 19 J s
- D. 9.1 times 10 to the minus 31 J s
Explanation
The extreme smallness of Planck's constant is why quantisation is invisible in everyday life and only matters at atomic scale. The other values given are the speed of light, the electronic charge and the electron mass respectively, all of which appear alongside it in the same formulae. Knowing which constant is which prevents easy marks being dropped.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? support@testustad.com
About Planck's Quantum Theory
Planck's quantum theory states that energy is emitted or absorbed in discrete packets called quanta, with each packet having energy E = hν. It covers the meaning of Planck's constant, the relationship between frequency and wavelength, and how quantisation differs from the classical continuous model of energy.
Practise Atomic Structure
922 free Atomic Structure MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Chemistry questions like this
Chemistry is on 14 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Planck's Quantum Theory questions
Planck's quantum theory states that energy is emitted or absorbed
The energy of a quantum of radiation is directly proportional to its
The value of Planck's constant is:
When the radiation of light is passed through a prism, it undergoes __________?
The earth absorb radiation in Visible range but emit radiation at the same rate in the: