Question

7. The loudness of sound depends on its
a) time period
c) amplitude
b) frequency
d) speed
8. A boy rolls a rubber ball on a wooden surface. The ball
before coming to rest. How can we make the same ball t
before it comes to rest?
a) Place sandpaper on the wooden surface b) Pour oil o
c) Sprinkle sand over the wooden surface d) Cover the
9. An object is vibrating at 40 Hz. What is its time period
a) 0.025 s
ds
b) 0.25 sec
d) 25 seco
CL​

Answer 1

Answer:

i dono know sorry its too hard

Answer 2

Answer:

( 7 ) C

(8) (C) make the same ball to roll over a longer distance, friction between the floor and the ball is to be reduced. Sprinkling talcum powder on the wooden floor will decrease the friction. Therefore, to make the long-distance before coming to rest, he may sprinkle talcum powder on the wooden surface.

(9) 2.5 second