1.

Wave goes from rarer medium to Denser medium (f = freq. of wave, λ = wavelength of wave, v = speed of wave) (1) V1 f and λ all are increases (2) V1 f and λ all are decreases(3) f constant but v and λ decreases(4) f constant but v and λ increases

Answer»

(3) f constant but v and λ decreases

v = fλ

f = constant

so , v ∝ λ

in denser medium v decrease.



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