What is Planck's constant?

Planck's constant is a fundamental constant in quantum mechanics, symbolized as ( h ), that plays a crucial role in the quantization of energy, particularly in the relationship between energy and frequency of electromagnetic radiation. It is defined as ( h \approx 6.626 \times 10^{-34} ) Joule seconds. This value is essential for understanding phenomena such as the photoelectric effect, where light can be thought of as being composed of quantized packets of energy called photons. The energy of these photons is directly proportional to the frequency of the light and is calculated using the formula ( E = hf ), where ( E ) is the energy, ( h ) is Planck's constant, and ( f ) is the frequency.

The other values listed represent different physical constants or quantities but do not correspond to Planck's constant. For example, the value ( 6.022 \times 10^{23} ) refers to Avogadro's number, which is the number of atoms or molecules in one mole of a substance. The value ( 1.6 \times 10^{-19} ) is the approximate charge of an electron in coulombs, and ( 3 \times