The fundamental frequency of a vibrating organ pipe is `200 Hz`.
(i) The first overtone is `400 Hz`.
(ii) The first overtone may be `400 Hz`.
(iii) The first overtone may be `600 Hz`.
(iv) `600 Hz` is an overtone.

Options

A. (i), (iv)
B. (i), (i), (iii)
C. (iii), (iv)
D. (ii), (iii), (iv)

Answer

D

Explanation

Frequencies of closed pipe: `200, 600, 1000`, ….
Frequencies of open pipe: `200, 400, 600, 800`, …
(i) First overtone is `600 Hz` for closed pipe, `400 Hz` for open pipe, (i) is wrong
(iv) `600 Hz` is first overtone of closed pipe, second overtone of open pipe, (iv) is `O.K`.