2. Fill in the blanks a. Loudness of sound depends on and Pitch of the sound depends on
.
b. Closer the waves, the frequency and taller the waves, the frequency.
c. Frequency range of audible sound is Hz to Hz.
d. Sounds with very high frequency are and sounds with very low frequency are
.
e. Unwanted sound is called .

The basic properties of sound are: pitch, loudness and tone. Figure 10.2: Pitch and loudness of sound. Sound B has a lower pitch (lower frequency) than Sound A and is softer (smaller amplitude) than Sound C. The frequency of a sound wave is what your ear understands as pitch.

Explanation:

Hope this helps in some way

a. Loudness of sound depends on amplitude of sound waves and Pitch of the sound depends on  frequency.

b. Closer the waves, the higher the frequency and taller the waves, the lower the frequency.

c. Frequency range of audible sound is 20 Hz to20 k Hz.

d. Sounds with very high frequency are high-pitched sounds, and sounds with very low frequency are low-pitched sounds.

e. Unwanted sound is called Noise.

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answer: the exterior temperature of commercial jet planes as they leave the stratosphere and return to the ground increases steadily.

explanation:

the lower most layer of atmosphere is troposphere which extends from 0 to 12 km above the surface of the earth. the temperature initially decreases as distance is increased from the earth's surface. commercial jets fly in lower part of the stratosphere. the stratosphere extends upto 50 km. the temperature in stratosphere starts rising again due to presence of ozone which traps the uv rays.

thus, when the planes leave the stratosphere and return to the ground, the exterior temperature increases steadily.