Of the following,the one which emits a sound of higher pitch is:

To raise the pitch of a stringed musical instrument,the player can:

The loudness and pitch of a sound depend on

The walls of the halls built for music concerts should

$A$ hearing test is conducted on an aged person. It is found that her threshold of hearing is $20 \, dB$ at $1 \, kHz$ and it rises linearly with frequency to $60 \, dB$ at $9 \, kHz$. The minimum intensity of sound that the person can hear at $5 \, kHz$ is

Tone $A$ has a frequency of $240 Hz$. Of the following tones,which one will sound least harmonious with $A$ (in $Hz$)?