Question

What is the value of Planck's constant?
1. 6.023 × 10²³ J-s
2. 6.626 × 10-34  J-s
3. 6.67 × 10^-11 J-s
4. None of the above

Answer 1

Correct Answer - Option 2 : 6.626 × 10-34  J-s

CONCEPT:

• ​Planck's constant: When the frequency of its electromagnetic wave increases by 1 (In SI Units), it tells how much the energy of a photon increases.  
  • Planck's constant is named after the name of physicist Max Planck.
  • In SI Units the value of the Planck constant is exactly 6.62607015 × 10⁻³⁴ J-s

EXPLANATION:

• The value of Planck's constant is 6.626 × 10-34  J-s
• It is represented by the symbol 'h'.

h = 6.626 × 10-34  J-s

• So the correct answer is option 2.