Explain what is a crest?
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When are intermolecular forces the strongest?
Do radio-waves go in straight line ?
What is a thermal transformation?
An ice-box is built of wood 1.75 cm thick, lined with cork 3 cm thick. If in the steady state the temperature of the inner surface of the cork is 0 ºC and that of the outer surface of wood is 12 ºC, what is the temperature of the wood-cork interface? The thermal conductivities of wood and cork are 0.2 W/m-K and 0.04 W/m-K respectively
Why does a semicondctor act as an insulator at 0'k and why its conductivity increases with increasing temperature?
Why does sun appear flat during sunrise and sunset?
What is the role of a transformer in a rectifier?
Why is there more friction when you push an object than when you pull it?
Explain the Use of manometer.
Explain what is larger the force the earth exerts on you or the force you exert on the earth?
What are the essential characteristics of a wave?
Define Penumbra ?