A pond is covered by a sheet of ice 2.0 cm thick (thermal conductivity 1.6 jm^(-1)s^(-1)k^(-1) . The temperature of the lower surface of ice is 0^@ C and that of the upper surface is -10^@ C . At what rate is heat conducted through each square meter of the ice ? What is the direction of this flow of energy ?

Total area of glass - planes of the window in a room is 10 m^2 and thickness is 2mm .Temperature outside and inside of the room are respectively 5^@ C and 20^@C . What is the amount of heat in calories flowing out of windows of the room per minute ? K for glass - 0.84 in mks system

A point charge causes an electric flux of -3.1xx10^(4)" N-m"^(2)//C to pass through a spherical Gaussian surface. If the radius of the Gaussian surface is doubled, how much flux would pass through the surface ?

A liquid rises to a height 7.0 cm in capillary of radius 0.1mm. If the density of density of liquid is 0.8 X 10^3 kg/ m^3 and the liquid wets the glass , find the surface tension of liquid .

A point charge causes an electric field of -1.0xx10^3Nm^2//C to pass through a spherical Gaussian surface of 10.0 cm radius centred on the charge If the radius’ of the Gaussian surface were doubled, how much flux would pass through the surface ?

One surface of convergent lens of 0.20 m focal length is convex and has radius of curvature 0.25m. If the refractive index of glass of which the lens is made is 1.5, what is the radius of curvature of other surface?

State the relationship amongst cell constant of a cell resistance of the solution in the cell and conductivity of the solution. How is molar conductivity of the solution is related to conductivity of its solution ? A voltaic cell is set up at 25^(@)C with the following half cells Al//Al^(3+) (0.001 M) and Ni//Ni^(2+)(0.50M) Calculate the cell voltage. [(E_(Ni^(2+)//Ni)^(@)= -0.25V","),(E_(Al^(3+)//Al)^(@)= -1.66V),(E_("Cell")^(@)=1.4602V)]

Metal slab is made up of two parallel side plates of metal A and metal B of thickness 0.6 cm and 0.4 cm respectively. Their respective thermal conductivities are 2.268 and 1.008 SI unit. The outer surface of the plate A is at 220^@ and that of plate B at 20^@ . Find the temperature of the interface .

An external field of 1000 Volt /m maintains a current density of 0.1 Amp/m^2 . Calculate (a) the resistivity (b) the conductivity.

A pure germanium plate of area 3.5 xx 10^(-4) m^2 and of thickness 1.5xx 10^(-3) m is connected across a battery of potential 5 V. Find the amount of current produced at room temperature in the germanium sample. Given that the concentration of carriers in germanium at room temperature is 16 xx 10^6 m^3 . The mobilities of electrons and holes are 0.4 m^2v^(-1) s^(- 1) and 0.2 m^2 v^(-1) s^(-1) , respectively.