Question

18. In alpha decay of a nucleus, the mass number reduces by 4 and the atomic number increases by 2:

a) true

b) false

19. What is Coulomb's force between a proton and an electron separated by a distance of 5E-8 cm?

a) 3.6E14 N

b) 3.6E-14N

c) -9.22E-10 N

d) none

e) 9.22E10 N

20. Two parallel wires at 100.0 cm apart, and each carries a current of 10.0 A. If the currents are in the same direction, find the force per unit length exerted by one wire on the other and the nature of their interaction:

a) 2E-5 N/m, they attract each other

b) 2E-7 N/m, they attract each other

c) 2E-5 N, they repel each other

d) none

e) 2E-5 N, they attract each other

Answer 1