A wave is transmitted from a denser to rarer medium. Then, match the following columns and mark the correct…
A wave is transmitted from a denser to rarer medium. Then, match the following columns and mark the correct option from the codes given below.
| Column I | Column II |
| --- | --- |
| (A) Frequency of wave | (p) will increase |
| (B) Speed of wave | (q) will decrease |
| (C) Wavelength of wave | (r) will remain unchanged |
| (D) Amplitude of wave | (s) may increase or decrease |
(a) q r p s
(b) p q r p
(c) r p p p
(d) p r q s
Solution
Frequency is a property of the source and remains unchanged; $\lambda=\dfrac{v}{f}$ so $\lambda\propto v$.
Amplitude relation used: $A_2=\left(\dfrac{2v_2}{v_1+v_2}\right)A_1$. Since $v_2>v_1$, $A_2>A_1$.
Hence the column matches are: A→r, B→p, C→p, D→p (option (c)).