[amp_mcq option1=”Infrared” option2=”Ultraviolet” option3=”Microwaves” option4=”X-rays” correct=”option2″]
The correct answer is: B. Ultraviolet
A fluorescent tube is a glass tube that contains a gas, usually mercury vapor. When an electric current is passed through the tube, the mercury atoms emit ultraviolet light. This ultraviolet light then strikes a phosphor coating on the inside of the tube, causing the phosphor to emit visible light.
Infrared light is a type of electromagnetic radiation with a wavelength longer than visible light. It is emitted by hot objects, such as the sun, and can be felt as heat.
Microwaves are a type of electromagnetic radiation with a wavelength longer than infrared light but shorter than radio waves. They are used in microwave ovens to heat food.
X-rays are a type of electromagnetic radiation with a wavelength shorter than visible light but longer than gamma rays. They are used in medical imaging to create images of the inside of the body.
The radiation initially produced in a fluorescent tube is ultraviolet light. This is because the mercury atoms in the tube emit ultraviolet light when they are excited by an electric current. The ultraviolet light then strikes a phosphor coating on the inside of the tube, causing the phosphor to emit visible light.