Question

1.A U-238 atom (uranium-238) has a nucleus with 92 protons and an atomic mass of 238.0507882 u. What is the nuclear binding energy per nucleon in this atom?

Group of answer choices

1.93 MeV

7.57 MeV

12.3 MeV

19.6 MeV

1802 MeV

2.What is the DeBroglie wavelength of an antineutrino with a kinetic energy of 1.8 MeV? Take the mass of the antineutrino to be 4.99E-37 kg.

Group of answer choices

1.75 nm

2.88E-4 nm

5.36E-16 nm

8.45E-12 nm

3.Which of the following electronic configurations is not possible:

Li-3: 1s2 2s1

N-7: 1s2 2s2 2p3

Ne-10: 1s2 2p6 3s2

K-19: 1s2 2s2 2p6 3s2 3p6 4s1

All of the above configurations are possible.

Answer 1

1.

BE/nucleon Zmp + (A - Z)mn - A A

BE/nucleon 92 * 1.00728+ (238 – 92) * 1.00866 – 238.0507882 238 7.57MeV

Option ( 2 )

2.

de- Broglie wavelength,

X= h /2mK 6.626 * 10- V2 * 4.99 * 10-37 * 1.8 * 106 * 1.6 * 10-19 1.75nm

Option ( 1 )

3.

electronic configuration of Neon is  1s2 2s2 2p6 since it is an inert gas. So given electronic configuration is wrong

option ( 3)