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

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

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Physics
What is the principle of a ''Life Jacket"?

It provides oxygen to a drowning person
The person can sit on it like a raft
It increases the volume of the person to keep him afloat
It decreases the volume of the person to keep him afloat

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