Question

. What is the audible frequency range of humans?
a) Below 20 Hz b)Between 500 and 10.000 HZ
c) Between 20 and 20.000 Hz. d) Above 20,000Hz
The loudness of sound depends on its
a) time period
b) amplitude
c) frequency
d)speed
A boy rolls a rubber ball on a wooden surface. The ball travels a short distance
before coming to rest. How can we make the same ball travel a longer distance
before it comes to rest?
a) Place sandpaper on the wooden surface
b) Pour ol on the wooden surface
c) Sprinkle sand over the wooden surface
d) Cover the ball with jute
9. An object is vibrating at 40 Hz. What is its time period?
a) 0.025 seconds
b) 0.25 seconds
c) 25 seconds
d) 25 seconds​

Answer 1

Answer:

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Explanation:

1. c

2.b

3.To make the 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.