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1 Primary & Middle School Physics1–9 年级在线 2 High School Physics10–12 年级在线 3 University Physics — Year 1本科一年级在线 4 University Physics — Year 2本科二年级在线 5 University Physics — Year 3本科三年级在线

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1 Markets I: The Ecosystem and Exchange-Traded Markets市场在线 2 Markets II: Rates, FX and Credit市场在线 3 Markets III: Commodities, Energy and Crypto市场在线 4 Quantitative Methods方法在线 5 Derivatives and Volatility衍生品在线 6 Rates, Credit, XVA and Risk利率、信用与风险在线 7 Research Craft: Predictors, Backtests, Measurement, Portfolios研究在线 8 Strategies I: Equities and Futures策略在线 9 Strategies II: Volatility, Relative Value, Macro and the Bank Desks策略在线 10 Microstructure and Execution交易执行在线 11 Market Making and High-Frequency Trading做市在线 12 Machine Learning for Markets机器学习在线 13 Low-Latency Software技术在线 14 Networks, Hardware and Trading Infrastructure技术在线 15 Research, Data and Risk Platforms技术在线 16 The Desk and the Firm公司运营在线 17 The Industry: Firms, Roles and Careers职业发展在线 18 Interviews I: Maths, Probability and Speed职业发展在线 19 Interviews II: Markets, Trading Games and the Final Round职业发展在线 20 Interviews III: Code职业发展在线

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Physics · 术语表

什么是 The photon？

又称： photon · Planck's constant

Definition 34.1 High School Physics · 第 34 章 — The Quantum World: Photons and Energy Levels

Light of frequency $\nu$ exchanges energy with matter only in whole grains called photons, each of energy

E = h\nu = \frac{hc}{\lambda}, \qquad h = 6.63 \times 10^{-34}\,\mathrm{J}\,\mathrm{s},

where $h$ is Planck’s constant (Planck, 1900; Einstein, 1905) and $\lambda$ the wavelength in vacuum. A beam’s intensity measures the number of photons per second; each grain’s energy is fixed by the frequency alone.

One scale for the electromagnetic family (): wavelength (top), energy per photon hc/ (blue), from radio grains of a microelectronvolt to the MeV gamma grains of — yet a 1.0\, mW pointer pours 3 × 1015 grains per second: everyday light flows as smoothly as poured sand. — One scale for the electromagnetic family (Chapter 22): wavelength (top), energy per photon $hc/\lambda$ (blue), from radio grains of a microelectronvolt to the $\mathrm{MeV}$ gamma grains of Chapter 19 — yet a $1.0\,\mathrm{mW}$ pointer pours $3 \times 10^{15}$ grains per second: everyday light flows as smoothly as poured sand.

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