1. Indicate whether the following statements are true (T or false (F). [80 point
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1. Indicate whether the following statements are true (T or false (F). [80 points There are more known radioactive auclides than stable nuclides. A neutron is a fundamental particle in that it has no consituents. A gamma ray has no rest mass but does have momentum. A ground-state nncleus with N neutrons and Z protons has a mass less than the mass of N neutrons and Z protons A raindrop has a wavelength. In Einstein's famous equation E = me, the quantity E is the kinetic energy of the mass T The L-shell of a neutral atom of "O contains 5 electrons. The deBroglie wavelength of a proton increases with increasing speed of the proton The Q-value for elastic scattering of a neutron is always positive. The Heisenberg uncertainty principle places a fundamental limit on how accurately we can know both the position and momentum of a particle. An alpha particle contains four neutrons Ina binary nuclear reaction denoted +xY+y the product Y cannot be radioactive Electrons are bound to nuclei by gluons The nuelide 15O is radioactive. The binding energy per nucleon of 0Ca is greater than that of 2asU The "mass defect" refers to an atom that has lost an electron A proton is converted into a neutron in the positron reaction 2Na 2Ne +41e+v All quarks have the same charge as an electron The atoic number of 11Sn is 69.Explanation / Answer
1 F
2 F neutron is made up of quarks
3 T
4 T some mass is lost in binding energy
5 T according to de Broglie hypothesis every material particle moving has a wavelength although small for massive particles.
6 F E is the total energy
7 F oxygen has two shells K(2 electrons) and L(6)
8 F wavelength is inversly prop to momentum(velocity)
9 T Q=0 for elastic scaterring
10 T greater or equal to hbar/2
11 F 2 protons and 2 neutrons
12 T it willbe stable
13 F only protons and neutrons are bound by gluons
14 T
15 F
16 F
17 T mass no remains same but atomic no decreases by 1
18 F either 1/3e or 2/3e
19 F no of neutrons is 69 but no of protons is 50
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