- What is the speed of electrons in a vacuum?

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Differentiate: i) sqrt (sinx)/ sin sqrt(x) ii) sin^3 x iii) tan (sinx) iv) arctan (x sin α) / (1 +xcos α)? What is the significance of the magnetic field being inhomogeneous in the Stern-Gerlach experiment? Please help me differentiate all these:? The ratio of 10 feet to 30 inches is? 10 feet 30 inches into inches?