Physics
What is the wavelength of visible spectrum ?

3900 A° – 7600 A°
8500 A° – 9800 A°
1300 A°–3000 A°
7800 A° – 8000 A°

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Physics
Stationary wave is formed by

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

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