Consider the following statements regarding LED 1 A light emitting diode LED is a semiconductor devi...........

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Consider the following statements regarding LED :

1. A light-emitting diode (LED) is a semiconductor device that emits visible light when an electric current passes through it.

2. The output from an LED can range from red (at a wavelength of approximately 700 nanometers) to blue-violet (about 400 nanometers)

3. It has absence of lead or mercury

Which of the above match is incorrect:

1 and 2 only

2 and 3 only

1 and 3 only

All

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Explanation:

exp: All statements are correct and A light-emitting diode (LED) is a semiconductor device that emits visible light when an electric current passes through it.The output from an LED can range from red (at a wavelength of approximately 700 nanometers) to blue-violet (about 400 nanometers).It has absence of lead or mercury.