173089 A vehicle, with a horn of frequency $n$ is moving with a velocity of $30 \mathrm{~m} / \mathrm{s}$ in a direction perpendicular to the straight line joining the observer and the vehicle. The observer perceives the sound to have a frequency $n+n_{1}$. Then (If the sound velocity in air is $300 \mathrm{~m} / \mathrm{s}$ )
173089 A vehicle, with a horn of frequency $n$ is moving with a velocity of $30 \mathrm{~m} / \mathrm{s}$ in a direction perpendicular to the straight line joining the observer and the vehicle. The observer perceives the sound to have a frequency $n+n_{1}$. Then (If the sound velocity in air is $300 \mathrm{~m} / \mathrm{s}$ )
173089 A vehicle, with a horn of frequency $n$ is moving with a velocity of $30 \mathrm{~m} / \mathrm{s}$ in a direction perpendicular to the straight line joining the observer and the vehicle. The observer perceives the sound to have a frequency $n+n_{1}$. Then (If the sound velocity in air is $300 \mathrm{~m} / \mathrm{s}$ )
173089 A vehicle, with a horn of frequency $n$ is moving with a velocity of $30 \mathrm{~m} / \mathrm{s}$ in a direction perpendicular to the straight line joining the observer and the vehicle. The observer perceives the sound to have a frequency $n+n_{1}$. Then (If the sound velocity in air is $300 \mathrm{~m} / \mathrm{s}$ )