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Q 38

Physics for Scientists and Engineers: A Strategic Approach with Modern Physics
Found in: Page 1115

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Short Answer

The wavelengths of light emitted by a firefly span the visible spectrum but have maximum intensity near 550 nm. A typical flash lasts for 100 ms and has a power output of 1.2 mW. How many photons does a firefly emit in one flash if we assume that all light is emitted at the peak intensity wavelength of 550 nm?

Number of photons emitted are .

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Step by Step Solution

Step 1. Given information is :Maximum intensity of Light - 550 nmFlash lasts for 100 ms and Power output = 1.2 mW 

We need to find out the numbers of photons that the firefly emits in one flash.

Step 2. Using the definition of Power.

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