In a fluorescent tube, how are the atoms in the tube excited?
As there is a potential difference in the fluorescent tube. Electrons will flow from negative to the positive . These electrons collide with the orbital electrons in the atoms of the fluorescent tube. As there is an energy transfer from the free moving electron to the orbital electrons. The orbital electrons gain energy and become excited. They now exist on a higher enery level until they de-excite.
SW
Related Physics A Level answers
All answers ▸You are in a vacuum chamber, and you drop a feather and a bowling ball (initially at rest) from a great height. Which will hit the ground first?
A car of mass m is travelling at a speed v around a circular track of radius r banked at an angle θ. (a) What is the centripetal acceleration of the car? (b) What is the normal force acting on the car? (c) If θ = 45°, r = 1 km what is the maximum speed?
What are the postulates of special relativity?
The roar of a tiger in a zoo can be heard by visitors at the entrance, even though the tiger can not be seen because there is a hill in the way. Name and explain this effect.