Question

select all the correct answers.
tina is waiting at the bus stop. she sees and hears an ambulance as it approaches and passes by her. which two changes in the loudness of the siren does tina hear?

the sound becomes less loud as the ambulance approaches her.
the sound becomes louder as the ambulance approaches her.
the loudness of the sound remains the same as long as she can see the ambulance.
the sound stops when it reaches her.
the sound becomes less loud as the ambulance moves away from her.

Explanation:

To solve this, we use the concept of sound intensity and distance. As a sound source (ambulance siren) approaches, the distance between Tina and the ambulance decreases, so the sound becomes louder (since sound intensity increases with decreasing distance). When the ambulance moves away, the distance increases, so the sound becomes less loud. The other options are incorrect: the first is opposite, the third is wrong (loudness changes with distance), and the fourth is wrong (the siren doesn't stop when reaching her).

Answer:

B. The sound becomes louder as the ambulance approaches her.
E. The sound becomes less loud as the ambulance moves away from her.