CUET · PHYSICS · PYQ PAPER 2023
Why do light emitting diodes are preferred over conventional incandescent low power lamps?
- A High operational voltage and less power
- B Short life and ruggedness
- C The bandwidth of emitted light is 10 nm to 50 nm
- D Warm up time required
Answer & Solution
Correct Answer
(C) The bandwidth of emitted light is 10 nm to 50 nm
Step-by-step Solution
Detailed explanation
LEDs are preferred because they emit nearly monochromatic light with a narrow bandwidth (10 nm to 50 nm), making them highly efficient. Unlike incandescent lamps, they also feature low operational voltage, long life, and no warm-up time. C) The bandwidth of emitted light is 10…
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