State Stefan’s Law. The radii of two spheres are 1 m and 4 m and temperatuiie 4000 K and 2000 K respectively. Calculate the ratio of the energy radiated per second.

Two black bodies A and B have equal surface areas and are maintained at temperatures 27° C and 177° C respectively. What will be the ratio of the thermal energy radiated per second by A to that by B ?

The rate constants of the reaction at 500k and 700k are 0.02s^-1 and 0.07s^-1 respectively. Calculate the values of E_a and A.

The rate constants of reaction at 500K and 700K are 0.02s^(-1) and 0.07s^(-1) respectively. Calculate the values of E_(a) and A.

The uncertainties in posiiton and velocity of a particle are 10^(-10) m and 5.27xx10^(-24)m*s^(-1) respectively. Calculate the mass of the particle.

The uncertainty in position and velocity of a particle are 1.0xx10^(-5) m and 4.28xx10^(-20)m*s^(-1) respectively. Calculate the mass of the particle.

Two particles have masses m & 4m and their kinetic energies are in the ratio 2: 1 . What is the ratio of their linear momenta?

The ratio of the radii of two spheres made of the same material 1:4. The ratio of their thermal capacities is