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Two nuclides are represented as X(mass number= 70, proton= 32) and Y(mass number=37, proton=17) are added to a proton to form a new nuclide. Determine the ratio of a proton-neutron of the new nuclide.
Gold has a density of 19 700 kg m-3. 193 g of gold
contains 6.02 × 1023 atoms. Use this information
to estimate the volume of a gold atom, and hence
its radius. State any assumptions you make.
(a). Derive the cohesive energy for ionic crystals. Also explain the significance of Madelung’s constant using suitable diagram
Which of the following statements about heat transfer is NOT true?
A. Radiation transmits heat through air with the speed of light in air
B. In a fluid, heat is transmitted upwards mainly by mass movement of fluid molecules
C. A poor conductor has a low value of thermal conductivity
D. All good thermal conductors are not necessarily good electrical conductors
A +100μC charged is place at the origin. A +200μC charge is place 2m above the origin and a -300μC charged is placed on 3m to the right of the origin. What is the magnitude and direction of the net force acting on the charge placed at the origin?
At the instant the bob of an oscillating pendulum reaches the equilibrium position, the displacement is zero. Which of the following statements correctly describes the kinetic energy of the bob and the tension in the thread from which it is hanging at zero displacement?
A. Zero k.e and max tension
B. Max k.e and max tension
C. Max k.e and min tension
D. Zero K.e and Min tension
Transverse waves can be distinguished from longitudinal waves using
A.Polarisation B. refraction C. reflection D. diffraction E.Luminosity F. Dispersion
