1.

Give scientifcic reasons:a. It is essential to change the tension on the vocal cords, as we produce different sound notes from our larynx.b. Astronauts on the moon can not hear each other directly.c. As the sound wave propagates from one place to the other in air, the air itself is not required to move from one place to the other.

Answer» Give scientifcic reasons:

a. It is essential to change the tension on the vocal cords, as we produce different sound notes from our larynx.

b. Astronauts on the moon can not hear each other directly.

c. As the sound wave propagates from one place to the other in air, the air itself is not required to move from one place to the other.


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