Physics
Which of the following experiments analyzed the Fraunhofer lines of the solar spectrum?

Bunsen and Kirchhoff's experiment
Geiger and Marsdens experiment on scattering of alpha particles
Barkla's experiment on scattering of X-rays
Lamb-Rutherford experiment

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Physics
A stone floor feels cold to the bare feet but a carpet on the same floor feels warm. This is because

The floor and carpet are at different temperatures
The stone conveys the heat away from the feet more rapidly than the carpet
The human body maintains a constant temperature
The carpet is a better conductor of heat than the stone

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