hey dear..
solve it..both 153 and 154
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Q. 153 -- 1st option is the correct answer
wavelength will be 1.21 Angstrom
hint - distance between two consecutive nodes or antinodes is wavelength/4
Q. 154 -- 1st option is the correct answer
Freq will be 1.47
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hey
153. option A
154. Option A
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