Given :
An electron with kinetic energy of 3 MeV.
To Find :
The de-Broglie wavelength for that electron.
Solution :
We know, de-Broglie wavelength for an electron with kinetic energy K.E is given by :
Putting all given values in above equation, we get :

Hence, this is the required solution.
Mechanical waves require a medium to travel, but electromagnetic waves do not.
Answer/Explanation:
As the left hand was put in hot water, warm thermoreceptors initiated signals, allowing you to identify the water in this pot as "warm." After awhile the thermoreceptors in your hands quieted down.
There are a lot of reasons why gum is bad for you but a main reason because if you make a bubble and swallow it you could choke. Another reason is because it breaks down your gums.