4. Why does sound become weaker or fainter as it moves away from the observer?

a. The sound is lowered by the operator

b. The sound spreads to cover a smaller area

c. The sound spreads to cover a larger area

d. The sound is already absorbed by the environment

5. Which is true about the characteristics of sound?

a. Sound could either be soft or loud

b. The loudness of sound decreases as it moves nearer thevobserver

c. Sound is not heard when it is exactly on the same spot as
the listener

d. The loudness of sound

6. Which of the following statement is true?

a.light always travel in a straight line

b.sound travels faster in air than solids

c.heat transfer through liquid is know as radiation

d.sound cannot travel to air

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