Homework Statement
fair coin is flipped 5 times
what is the probability that there will be at most 4 heads?
What is the expected number of heads?
What is the standard deviation for number of heads?I have no idea how to approach this question because I am unsure of what formulas need to be used :(
Homework Statement
What is the velocity of an electron having a De Broglie wavelength that is approximately the length of a chemical bond? Assume this length to be 1.6 A
Homework Equations
wavelength= h/mv
The Attempt at a Solution
I fixed the equation to isolate the velocity...