Consider a simo system, in which the sender has one antenna and the receiver has 2 antennas. suppose the sender sends bpsk signals and the receiver has established perfect symbol timing and carrier frequency offset compensation based on the signal received from antenna 1. suppose the two samples from the two antennas are -0.5+0.1j and 0.2+3j, respectively, and channel coefficients are 1 and 2j, respectively (the channel coefficient is defines as the sample the receiver sees if the sender sends 1 in the absence of noise). which statement is true?

1 a

2 b

3 b

4 d

5 d

6 d

explanation:

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.

answer: 2×10^-2kg

explanation: density= mass per volume

vol=mass/density

converting to s.i units we have;

3÷1000kg = 0.003

1.5÷100m = 0.15

0.003/0.15 = 0.02kg