A rectangular, air filled waveguide has dimension 2 cm x 1 cm. For what range of frequencies, there is a "single mode" operation in the guide?
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A calorimeter of mass 60g contains 180g of water at 29°C . Find the final temperature of the mixture when 37.2g of ice at -10°C is added to it( specific heat capacity of water=4200J/kg/k, latent heat of ice=336×10^3 J/kg, specific heat capacity of ice=2100J/kg/k, specific heat capacity of the calorimeter is 0.42J/g/°C
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