10th Physics Conceptual queston

1. Class 10th
Subject : Physics
Unit:11
Sound
Prepared BY ; Umar Tabraiz

2.  Air is a lighter medium than any other physical state of
matter i.e. liquid and solid.
 Sound expands in air in all directions and
communication becomes difficult between two points.
 But through tin can and wire system sound waves
travel in specific than air.

6.  It is better way to communicate because the
sound have high speed in solid than air and also
maximum intensity (energy) will be transfer
through string.
 While in case of air speed is slow and intensity
will be spread over large area

7. Answer: We recognize two persons speaking with same loudness
and pitch because of their sound quality.
Sound quality is the characteristic of sound waves defined as:
 “The characteristic of sound by which two sounds of same
loudness and pitch are distinguished from each other”
 The pitch of a sound depends on the frequency of the source
of sound.
 Loudness :The larger the amplitude the more energy the
sound wave contains therefore the louder the sound.

8.  Persons speaking with the same loudness may have
different quality of sound and pitch , That’s why it
will be easy to identify between different sound of
the persons.

12. 10 log 3 + 10 log 106
10 (0.477) + 60 log 10
4.77 + 60
64.77