Question:
How many wavelength of kr 86 are there in one metre ?
a) 2348123.73 b) 1553164.13 c) 652189.63 d)1650763.73
Answer:
Kr 86 corresponds to orange in the visible region.
The wave of Kr 86 hence has a wavelength of about 605 nm
Hence, in 1 meter, number of wavelengths of Kr 86 = 1 / (605 * 10-9) = approximately 0.00165289 * 109
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