Two slabs A and B of different materials but of the same thickness are joined end to end to form a composite slab. The thermal conductivities of A and B are K1 and K2 respectively. A steady temperature difference of 12 °C is maintained across the composite slab. If K1 = , the temperature difference across slabs A is
In short wave communication, waves of which of following frequencies will be reflected back by the ionospheric layer having electron density 1011 per m3?
A body of mass 4 kg moving with velocity 12 m/s collides with another body of mass 6 kg at rest. If two bodies stick together after collision, then the loss of kinetic energy of system is
A step-down transformer is used on a 1000 V line to deliver 20 A at 120 V at the secondary coil. If the efficiency of the transformer is 80%, the current drawn from the line is
1. 3 A
2. 30 A
3. 0.3 A
4. 2.4 A
Subtopic: Transformer |
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A black body at a temperature of 2600 K has the wavelength corresponding to maximum emission 1200Å. Assuming the moon to be perfectly black body the temperature of the moon, if the wavelength corresponding to maximum emission if 5000 Å is
1. 7800 K
2. 6240 K
3. 5240 K
4. 3640 K
Subtopic: Wien's Displacement Law |
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