A smoke alarm emits a signal of frequency 680 Hz. The alarm goes off, and someone becomes so annoyed with it that they tear it off the wall and drop it out of their office window in a high rise building. After some time, because of air resistance, the alarm falls at a constant speed of 68 m/s. The velocity of sound in air is 340 m/s. When the smoke alarm is falling at this constant speed, what is the wavelength in meters of the sound transmitted VERTICALLY DOWNARDS by the smoke alarm?
Properties of sound
A sound wave is a mechanical wave (or mechanical vibration) that transit through media such as gas (air), liquid (water), and solid (wood).
Quality Of Sound
A sound or a sound wave is defined as the energy produced due to the vibrations of particles in a medium. When any medium produces a disturbance or vibrations, it causes a movement in the air particles which produces sound waves. Molecules in the air vibrate about a certain average position and create compressions and rarefactions. This is called pitch which is defined as the frequency of sound. The frequency is defined as the number of oscillations in pressure per second.
Categories of Sound Wave
People perceive sound in different ways, like a medico student takes sound as vibration produced by objects reaching the human eardrum. A physicist perceives sound as vibration produced by an object, which produces disturbances in nearby air molecules that travel further. Both of them describe it as vibration generated by an object, the difference is one talks about how it is received and other deals with how it travels and propagates across various mediums.
A smoke alarm emits a signal of frequency 680 Hz. The alarm goes off, and someone becomes so annoyed with it that they tear it off the wall and drop it out of their office window in a high rise building. After some time, because of air resistance, the alarm falls at a constant speed of 68 m/s. The velocity of sound in air is 340 m/s. When the smoke alarm is falling at this constant speed, what is the wavelength in meters of the sound transmitted VERTICALLY DOWNARDS by the smoke alarm?
Trending now
This is a popular solution!
Step by step
Solved in 2 steps with 2 images
