Question 12
(a) Define each of the following terms as applied to the structure of the atom:
(i) isotopes;
(ii) isobars.
(b) A lead sphere of mass 5.0 x 10-3kg is allowed to fall to the ground from a height of 20.0 m. Determine the:
(i) speed of the sphere just before it hits the ground;
(ii) deBroglie wavelength of the sphere just before it hits the ground.[ g = 10.0 m s-2; h = 6.63 x 10-34J s]
(c) An electron is accelerated in an X-ray tube with a supply of 100 kV accelerating potential. Calculate the:
(i) speed of the electron;
(ii) wavelength of the x-ray that will be produced when the electron is suddenly Stopped by a solid metal placed on its path.[ h = 6.63 x 10-34J s, e = 1.6 x 10-19 C, Me = 9.1 x 10-31 kg ]
Observation
The expected response:
- (a) Definition of terms
- (i) Isotopes : Atoms of the same element with the same proton/atomic number but different neutron/mass number.
(ii) Isobars : Atoms of different elements with the same nucleon/mass number but different proton/atomic number.
