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Answer 1

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7. In human beings, vocal cords are responsible for the difference of woman's voice from man's voice. When the cords are tight and thin, the sound is of higher pitch or frequency. On the other hand, when the cords are loose and thick the sound is of low pitch or frequency. Men have longer vocal cords than women.

8. sound is a vibration that propagates as an acoustic wave, through a transmission medium such as a gas, liquid or solid. In human physiology and psychology, sound is the reception of such waves and their perception by the brain

9. the greatest distance that a wave, especially a sound or radio wave, moves up and down

10. is because light travels much faster than sound waves. We can estimate the distance of the lightning by counting how many seconds it takes until we hear the thunder.

Answer 2

Answer:

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Explanation:

7-Adult men and women typically have different sizes of vocal fold; reflecting the male-female differences in larynx size. Adult male voices are usually lower-pitched and have larger folds.

The female vocal folds are between 12.5 mm and 17.5 mm in length. The folds are within the larynx.

Hence female voice is more shrill than male voice.

8 - Sound is defined as vibrations that travel through the air or another medium as an audible mechanical wave. It is produced from a vibrating body. The vibrating body causes the medium (water, air, etc.) around it to vibrate thus producing sound.

9-The amplitude of a sound wave is the measure of the height of the wave. The amplitude of a sound wave can be defined as the loudness or the amount of maximum displacement of vibrating particles of the medium from their mean position when the sound is produced. It is the distance between crest or trough and the mean position of the wave.

10-During a thunderstorm, lightning is seen first and thunder is heard later on because light travels faster than sound. Lightning always comes with thunder. If you see a lightning flash but cannot hear any thunder, the thunderstorm is most likely be quite far away from you. The thunderclap must have been deflected up the sky. The longer the sound travels, the more it will be deflected away from the ground.