What is Planck's constant value?

Planck's constant is a fundamental constant in quantum mechanics that relates the energy of a photon to its frequency. It is a crucial factor in understanding phenomena such as the photoelectric effect and quantization of energy levels in atoms. The accepted value of Planck's constant is approximately 6.626 x 10^-34 J·s (joule-seconds), which is often rounded to 6.63 x 10^-34 J·s for convenience in calculations.

The value provided in the correct choice aligns closely with this accepted standard, making it the proper representation of Planck's constant. The precision of Planck's constant plays an essential role in calculations involving energy and frequency, reinforcing its importance in the field of physics.