The frequency of electromagnetic wave, which is best suited to observe a particle of radius 3 × 10^-4 cm is of the order of

(a) 10¹⁵

(b) 10¹⁴

(c) 10¹³

(d) 10 ¹²

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Sum of series 2[n/2] ! [n/2]!/ n! [2Co-2C2+3C2....+[-1]^n[n+1]2Cn] where n is an even positive integer. Kindly provide solution of this question and how to generalise this. How do we know that which expansion will give this?

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