Atomic and Nuclear Physics Answers

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

Compare alpha, beta and gamma emissions in terms of their mass, charge and relative ability to penetrate matter. 

What is the maximum velocity of a block of mass 2kg attached to a spring of spring constant k=8N/m undergoing simple harmonic motion with an amplitude of 0.1m?

Sketch a graph showing the gravitational acceleration(on the y-axis) Versus the distance from the center of the earth(on the x-axis).