Question

1. In a slide trombone, the tube increases in length as the musician extends the slide. How does extending the slide affect the fundamental frequency of the trombone? Explain.
2. A person sitting in a parked car hears an approaching ambulance siren at a frequency f, and as it passes him and moves away he hears a frequency f'. How does the actual frequency of the source compare to f and f'? Explain your reasoning. Your options are:
   1. Greater than f' but less than f
   2. greater than f but less than f'

Answer 1

So In La trombone we blows air through Cup Shaped mouthpiece. The mouthbiece. connects to a length ina bella of brass e tubing ending the pitch & freguney of sound depends upon the length of tube Smaller the length smaller the Iolume of vibrating and Lince higher pitch. on increasing dength by extending the slide frequency og Trom bore decreasy. mathematically also frequency Ne velocity involved air which So ከ V 4L Lt Length of be tuber

Since I er t when from doppler effect we know fattur)fo fort original frequency. fo received frequency. Ct Speed of sound in medium. + vet speed speed of receiver relative to medium. Source relative to medium. it is us when source appraches and vice-versa. → ambulance approaches the beson teved to s frequeny f> actual frequung. how. when combulance f's letto frequeny f < acteal frequency fo actual frequency to is greater then f' A but smaller fless than to So first option is correct. moves away