Question

Choose and write the facts related to LED lamps from the given list.
a. Require only a small quantity of power.
b. UV rays are produced due to electric discharge.
c. Not harmful to the environment since there is no mercury.
d. Intense light is produced when high voltage is applied.

Answer 1

Hint: The full form of LED is Light Emitting Diode. It emits light when current flows through it and it is a semiconducting light source. There are few facts related to LEDs, that it has lower energy consumption, stays for longer duration, smaller in size, and can be switched faster. So, by checking the four options given to us, and choosing the correct facts about LED, we will get our required answer.

Complete step by step answer:
We have been given a few sentences, we need to choose and write the facts related to LED.
So, out of four options, let us check one by one.
The first option is,
a. Require only a small quantity of power – It is true LED requires only a small quantity of power, so this option is correct.
b. Second option is, UV rays are produced due to electric discharge – It is false, as UV rays are not produced due to electric discharge by LED, so this option is incorrect.
c. Third option is, Not harmful to the environment since there is no mercury - It is true LED is not harmful to the environment since there is no mercury, so this option is correct.
d. Intense light is produced when high voltage is applied - It is false, Intense light is not produced when high voltage is applied to LED, so this option is incorrect.

 Thus, only option A and C is correct.

Note:Students should carefully read the sentences given to us, and check them one by one. If by prior knowledge of LED you feel that this is true, then the option is correct.
So, the LED requires only a small quantity of power to work properly. UV rays are produced due to electric discharge in water not in LED. The materials which are commonly used to make LEDs are gallium arsenide (GaAs) and gallium phosphide (GaP). Brightness increases, but intense light is not produced when high voltage is applied.