普朗克常数

普朗克常數

Pǔlǎngkèchángshù

noun

Meanings

1 Planck's constant (h ≈ 6.626 × 10⁻³⁴ J·s)

Characters

(transliteration syllable Pl-)

(transliteration syllable -an-)

(transliteration syllable -k)

Examples

普朗克常数是量子力学的基本常数。

Pǔlǎngkèchángshù shì liàngzǐ lìxué de jīběn chángshù.

Planck's constant is a fundamental constant of quantum mechanics.

光子的能量等于普朗克常数乘以频率。

Guāngzǐ de néngliàng děngyú Pǔlǎngkèchángshù chéng yǐ pínlǜ.

A photon's energy equals Planck's constant times its frequency (E = hν).

Tips

history

Named after German physicist Max Planck (普朗克 Pǔlǎngkè), who introduced h in 1900 to derive the black-body radiation law — the founding moment of quantum theory. Since 2019 it has been used to define the kilogram in SI units.

Stroke Order

普 pǔ

朗 lǎng

克 kè

常 cháng

数 shù