Sammy is talking to Sally. Position A is a position in front of Sammy’s mouth -[Free] B72
Sammy is talking to Sally. Position A is a position in front of Sammy’s mouth. Position B is a position in front of Sally’s ear. In order for Sally to hear Sammy’s voice, air particles must a. move from A to B b. move from A to B and then back to A c. vibrate parallel to a line connecting ( A ) and ( B ) d. vibrate perpendicular to a line connecting ( A ) and ( B )
![Sammy is talking to Sally. Position A is a position in front of Sammy's mouth -[Free] B72](data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20640%20145'%3E%3C/svg%3E)
How Sound Travels from Sammy to Sally
Sammy is talking to Sally. Position A is a position in front of Sammy’s mouth. Position B is a position in front of Sally’s ear. In order for Sally to hear Sammy’s voice, air particles must:
a) Move from A to B
b) Move from A to B and then back to A
c) Vibrate parallel to a line connecting A and B ✅
d) Vibrate perpendicular to a line connecting A and B
Answer:
The correct answer is: Vibrate parallel to a line connecting A and B.
Explanation:
Sound is a type of longitudinal wave. In such waves, the particles of the medium (in this case, air) vibrate parallel to the direction of wave propagation.
In the scenario given, Sammy is speaking and the sound travels from position A (in front of his mouth) to position B (in front of Sally’s ear). Therefore, the line from A to B represents the direction in which the sound wave travels.
To transmit sound, air particles oscillate back and forth along the same line as the wave’s direction. This is different from a transverse wave, where particles move perpendicular to the wave’s motion (such as water waves or light waves).
Why Not the Other Options?
- a) Air particles do not physically move from A to B; they only vibrate in place.
- b) This describes motion, not vibration, and is incorrect for longitudinal waves.
- d) Perpendicular vibration is characteristic of transverse waves, not sound.