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

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

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Physics
Stationary wave is formed by

Two waves of same frequency travelling in the same direction
Two waves of same frequency travelling in the opposite direction
Two waves of the same speed superposing
A transverse wave superposing a longitudinal wave

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