Answer: An electron will jump to a higher energy level when excited by an external energy gain such as a large heat increase or the presence of an electrical field, or collision with another electron.
Explanation:
Heat of vaporization of water will be required as water is already at it's boiling point thus heat required will be 540*10=5400 cal
More collisions occur making the particles used up
The electron microscope uses a beam of electrons and their wave-like characteristics to magnify an object's image, unlike the optical microscope that uses visible light to magnify images.