Two bodies P and Q have thermal emissivities of `varepsilon_(P) and varepsilon_Q` respectively. Surface areas of these bodies are same and the total radiant power is also emitted at the same rate. If temperature of P is `theta_P` kelvin then temperature of Q i.e. `theta_Q` is

Two bodies A and B have thermal emissivities of 0.01 and 0.81 respectively the outer surface area of the two bodies are the same. The twobodies emit total radiant spectral radiancy in the radiation from A and B respectively differ by 1.00 mum . If the temperature A is 5802 K, find a. the temperature of B lamda_(B)

Two bodies A and B having equal outer surface areas have thermal emissivity 0.04 and 0.64 respectively. They emit total radiant power at the same rate. The difference between wavelength corresponding to maximum spectral radiance in the radiation from B and that from A is 2 mum . If the temperature of A is 6000 K, then

Two finite sets A and B have p and q elements respectively (p>q). The number of subsets of power set of A is 240 more than the total number of subsets of power set of B.Then p+ q is

Two bodies P and Q are projected with velocites sqrt(2) u and u respectively. They cover the same horizontal distance. If body P is projected at 15^(@) will the horizontal, then calcu late the angle of projection of body Q.

Wires P and Q have the same resistance at ordinary (room) temperature. When heated, resistance of P increases and that of Q decreases. We conclude that

Wires P and Q have the same resistance at ordinary (room) temperature. When heated, resistance of P increases and that of Q decreases. We conclude that

Two substances P and Q are heated by using similar heating devices. The mass of P and Q are 100 g and 75 g, respectively. The initial temperature of P is 35^(@)C whereas the initial temperature of Q is 25^(@)C . If the temperature of the substance 'P' is increased to 75^(@)C in 40 minutes, determine the time required to raise the temperature of Q to the same value. The specific heat capacity of P and Q are 0.9 cal g^(@)C^(-1) and 0.6" "cal" "g^(@)C^(-1) , respectively.

Two metalic spheres p and Q are made of same material have same smoothness but the weight of p is 8 times that of Q if the two are heated to same temperature and left to cool then the ratio of rate of cooling of Q to that of p is

If tan theta = p/q then (p sin theta - q cos theta)/(p sin theta + q cos theta)=