Per person, the energy consumption in the United States is about 3.3 × 10^8 Btu/yr. This is equivalent to a power of:. A. 11.0 W
B. 11.0 W
C. 11.0 MW
D. 11.0 kW
E. 110 KW
F. 1.10kW
G. 11.0 QW
H. 0.11kW

Explanation:

Btu of British thermal unit is a unit of heat. The relation between btu/year and watts is given by :

So,   is equal to 11 kW. Hence, the correct option is (d).                                                                      

answer: the correct answer is 1.

explanation: there are various process in which a radioactive nuclei decays:

1) alpha decay: in this process, a heavier nuclei decays into lighter nuclei by releasing alpha particle. the mass number is reduced by 4 units.

2) electron capture: in this decay process, a parent nuclei absorbs an electron and gets converted into a neutron. simply, a proton and an electron combines together to form a neutron. mass number does not change in this process.

3) gamma ray emission: it is a decay process in which an unstable nuclei gives excess energy by a spontaneous electromagnetic process. this decay releases . this process does not change the mass number.

4) positron emission: it is a type of decay process, in which a proton gets converted to neutron and an electron neutrino. this is also known as -decay. in this the mass number remains same.

from the above information, we see that only alpha-decay is producing a change in the mass number of the nucleus.

grav forces affect all objects magnetic forces affect magnetic objects and electric currents