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The phenomenon of re-irradiation of abso...

The phenomenon of re-irradiation of absorbed light is called

A

Photoluminescence

B

Chemiluminescence

C

Phosphorescence

D

Fluorescence.

Text Solution

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The correct Answer is:
To answer the question "The phenomenon of re-irradiation of absorbed light is called," we can follow these steps: ### Step 1: Understand the Terms First, we need to understand the terms mentioned in the options: photoluminescence, chemiluminescence, fluorescence, and phosphorescence. ### Step 2: Define Photoluminescence Photoluminescence is the emission of light from a material after it has absorbed photons (light). This process involves the absorption of light, which excites electrons to a higher energy state, and then the re-emission of light as the electrons return to their ground state. ### Step 3: Differentiate Between Types of Photoluminescence - **Fluorescence**: A type of photoluminescence where the emitted light stops almost immediately after the excitation source is removed. - **Phosphorescence**: Another type of photoluminescence where the emitted light continues for a longer time even after the excitation source is removed. - **Chemiluminescence**: This is light emitted as a result of a chemical reaction, not related to the absorption of light. ### Step 4: Identify the Correct Answer Since the question specifically asks about the phenomenon of re-irradiation of absorbed light, the correct answer is **photoluminescence**. This is because both fluorescence and phosphorescence fall under the broader category of photoluminescence, but they describe specific behaviors of light emission. ### Conclusion Thus, the correct answer to the question is **photoluminescence**. ---
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