Question

A body vibrates 3000 times in one minute
if the speed of sound in air is 331 ms -1
then find the frequency of vibration.
(1)60 Hz
(2) 100 Hz
(3)50Hz
(4) 75 Hz
​

Answer 1

Answer:

Ans is option3= 50hz 3000/60

Answer 2

Answer:

The right answer to the given question is Option (3): 50 Hz.

Explanation:

• Frequency is known as the number of occurrences of a repetitive event in a particular amount of time.
• It is expressed by:

                                         $f=\frac{1}{T}$

where,

           f = frequency

          T = time period

• The number of vibrations taking place in a particular unit of time is called the frequency of vibrations.

• It is expressed by:

                                       $F=\frac{V}{t(sec)}$

where,

                      F = Frequency of vibrations

                      V = Number of vibrations

                       t(sec) = Time in sec

Here,

             No. of vibrations = 3000

             Time = 1 minute

             Time in seconds = 60

                                     ∴   $F =\frac{3000}{60} = 50 Hz$  

Thus, the frequency of vibration for a body that is vibrating 3000 times in 1 minute is 50 Hz.