1 watt is 1 joule/sec; so a 40. w light source is emitting 40. j every second. if a 40. w light source is emitting 575 nm light, how many photons does it emit in 1.0 minute (assume all energy goes to light, none lost to heat)?

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28-10-2022
Physics

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1 watt is 1 joule/sec; so a 40. w light source is emitting 40. j every second. if a 40. w light source is emitting 575 nm light, how many photons does it emit in 1.0 minute (assume all energy goes to light, none lost to heat)?

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abhinavjh321 abhinavjh321 · Answer 1 · 2022-11-02T07:45:20-04:00

A 40. w light source emits 40. j every second since 1 watt is equal to 1 joule every second. 6.9*1021 photons are emitted in 1.0 minute by a 40. w light source when it emits light at 575 nm.

In the International System of Units (SI), a watt is a unit of power or radiant flux that is equal to one joule per second or one kilogram per square second. It's employed to calculate the rate of energy transfer. The watt bears the name of James Watt (1736–1819), a Scottish mechanical engineer, scientist, and inventor who, in 1776, developed a steam engine that outperformed the Newcomen engine. The Industrial Revolution was fundamentally influenced by Watt's discovery.

According to electromagnetism, one watt is equal to one volt-ampere because it measures the rate at which electrical work is done when a current of one ampere (A) travels across an electrical potential difference of one volt (V).

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