Question

1. Which of the vibrations above will not produce sounds that we can hear?
a. Thumping on a table
b. Aeroplane engines
C. School bell
d. Oscillation of a pendulum
2. Which of the animals listed below can hear in the ultrasonic frequency range?
a. Rats
b. Cats
C. Dogs
d. All of these
3. Elephants and blue whales communicate using infrasonic frequencies, what frequency range
would that be?
a. Below 20,000Hz
b. Above 20 Hz
d. Between 20 Hz and 20.000 Hz
c. Below 20 Hz
4. If a vibrating object takes one-hundredth of a second to complete one vibration, can it be
heard by a human
being?




please answer these questions Fastly I am requesting u ​

Answer 1

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Answer 2

Answer:

1 d . oscillation of a pendulum