1. To verify the Laws of reflection of sound - Lab Experiment, Class 9 Science Video Lecture - Class 10

to verify the laws of reflection of
sound sound is a part of our everyday
sensory experience we hear chirping
birds voices of humans annoyingly loud
sounds and the soothing sounds of
running water mum what is reflection of
sound when a sound wave is incident on a
solid or liquid surface it bounces back
onto the same medium this is known as
the reflection of sound like light sound
to undergoes reflection from any hard
surface and obeys the same laws of
reflection which light obeys ma'am what
are the laws of reflection of sound
there are two laws of reflection the
direction in which the sound wave is
incident and the direction in which it
is reflected make equal angles with the
normal to the reflecting surface at the
point of incidence the incident sound
wave the reflected wave and the normal
at the point of incidence are in the
same plane let us understand the
reflection of sound by the help of
experiment our aim is to verify the laws
of reflection of sound materials
required polished metallic plate white
sheets to hollow glass tubes watch an
obstacle procedure place a white sheet
on the table and set a polished metallic
plate vertically on the sheet arrange to
hollow glass tubes in front of the
metallic plate place a cardboard between
two glass tubes place a watch at one end
of the glass tube II and adjust the
position of class to be so that the
tickling of the watch is distinctly hood
note on the position of gas cube
a and B and mark the angle of incidence
and angle of reflection observations
when angle of incidence is thirty degree
then angle of reflection is thirteen
degree when angle of incidence is fifty
degree then angle of reflection is forty
degree when angle of incidence is 45
degree then angle of reflection is 45
degree
when angle of incidence is 50 degree
then angle of reflection is 50 degree
when angle of incidence is 60 degree
then angle of reflection is 60 degree
resolve the angle of incidence and angle
of reflections are found to be same
precautions the reflecting surface
should not be sound-absorbing the ear
o'clock and deflecting surface should be
in the same plane the angle of incidence
and angle of reflection should be
measured a great need the class tube
news should be long and a smaller
diameter thank you ma'am
this experiment has made the concept
very easy to understand