Question

Which metal is used for electron beam generation in scanning electron microscopy?

• A. Tungsten (W)
• B. Magnesium (Mg)
• C. Mercury (Hg)
• D. Zinc (Zn)

Hint:

Consider the properties required for a metal to function as an electron emitter in SEM, such as a high melting point and thermal stability.

Answer 1

The Correct Option is A

Tungsten is the metal most commonly used for generating electron beams in scanning electron microscopy (SEM). Its high melting point, excellent thermal stability, and low vapor pressure make it ideal for withstanding the high temperatures required for electron emission.