Question

Out of the following, which frequency is not audible to the human ear?
A.30Hz
B.30000Hz
C.300Hz
D.3000Hz

Answer 1

Hint: in this question, we will discuss the basics of sound and frequency for our better understanding. Also, we will use the known frequency range that is audible to the human ear, this will help us to answer this question easily.

Complete answer:
As we know that a human being, who has hearing within normal range can hear sound that has frequency ranging from 20Hz to 20000Hz or 20 kHz.
This frequency range is called audible frequency range for human beings.
In the question, we are given a frequency of 30000Hz, which is beyond this audible frequency range; so, humans cannot hear sound at this frequency clearly.

Therefore, the correct option is B) i.e., 30000Hz is not audible to the human ear.

Additional information:
We know the basic difference of speed and velocity i.e., speed is the measure of how fast an object can travel, whereas velocity tells us the direction of this speed. Speed is a scalar quantity that means it has only magnitude, whereas velocity is a vector quantity that means it has both magnitude and direction. The S.I unit of velocity is meter per second (m/sec).
Further, the frequency is defined as the number of waves that pass a fixed point in unit time. It can also be defined as the number of cycles or vibrations undergone during one unit of time. The S.I unit of frequency is Hertz or Hz and the unit of wavelength is meter or m. Furthermore we also know the S.I unit of time which is given by second or s.

Note:
Here we should notice that the speed of sound is different in different mediums. Further, the speed that is more than the speed of sound is termed differently like- supersonic, hypersonic etc. we should also remember that the speed of light cannot be achieved by any other transport or object.