JEE MAIN - Physics (2002 - No. 42)
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
$$20$$
$$80$$
$$40$$
$$120$$
Explication
This will happen for fundamental mode of vibration as shown in the figure. $${S_1}$$ and $${S_2}$$ are rigid support
Here $${\lambda \over 2} = 40\,\,\,\,\,\,$$ $$\therefore$$ $$\lambda = 80\,cm$$
Here $${\lambda \over 2} = 40\,\,\,\,\,\,$$ $$\therefore$$ $$\lambda = 80\,cm$$