Explain how spectral lines show discrete energy levels in an atom. : quantum physics
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Why is one?s breath visible in cold, but not in not in hot weather ?
Explain the Stress ?
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 a pen used for writing with ink is always split as its pointed end?
a truck A moving with a velocity of 30m/s collides with a stationary trolley B of mass 0.5tonnes after collision the two bodies were automatically connected.find their common velocities after collision if the mass of truck is 1.2tonne.
What is Kinetic Energy ?
What instrument is used to measure volume?
Explain the Mass and Weight ?
what happens to the period of a simple pendulum taken into a deep mine ?
Why mercury rises in a barometer ?
Explain interference?
A burn from steam is more painful than that from boiling water. Why ?