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
Lamb-Rutherford experiment
Barkla's experiment on scattering of X-rays

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Physics
To prevent damage from lightning, lightning conductors are used on tall structures. The lightning conductor

Should be made of a good conductor but can be of any shape
Can be of any shape
Should be made of a good conductor like copper with sharp-pointed edges
Should be in the form of a vertical rod

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