question_answer

Length of a string tied to two rigid supports is 40 cm. Maximum length (wavelength in cm) of a stationary wave produced on it, is                                                                                                          [AIEEE 2002]

A)  20                               

B)  80

C)  40                               

D)  120

Correct Answer: B

Solution :

[b] When the string is plucked in the middle, it vibrates in one loop with nodes at fixed ends and an antinode in the middle.

So that,