In a double-slit experiment, electrons are fired at an opaque barrier having two small slits, and a screen beyond the barrier records where the electrons hit. after many electrons are fired, what is observed on the screen?

a. the pattern observed indicates that electrons struck only the areas of the screen directly across from the two slits.

b. the pattern observed indicates that electrons struck the screen directly across from the two slits and the center of the screen

c. the pattern observed indicates that electrons struck only the center of the screen.

d. the pattern observed indicates that electrons struck the screen in alternating bands across the screen.

How many neutrons does element x if it’s atomic number is 28 and its mass number is 87

The second largest public utility in the nation is the sole provider of electricity in 32 counties of southern florida. to meet the monthly demand for electricity in these counties, which is given by the inverse demand function p = 1,200 – 4q, the utility company has set up two electric generating facilities: q1 kilowatts are produced at facility 1, and q2 kilowatts are produced at facility 2 (so q = q1 + q2). the costs of producing electricity at each facility are given by c1(q1) = 8,000 + 6q12 and c2(q2) = 6,000 + 3q22, respectively. determine the profit-maximizing amounts of electricity to produce at the two facilities, the optimal price, and the utility company’s profit

Name three populations commonly found in a prairie system