Calculating Sea Depth from Sound Wave Speed and Wavelength
1. Yiying
Lin
15621148
LO
7/8
Short
answer
question:
The
sound
produced
by
an
object
has
a
wavelength
1m
in
the
air;
the
wave
speed
is
340
meters
per
second.
It
has
a
wavelength
4.5m
in
the
sea.
This
object
emits
a
sound
at
the
surface
of
the
sea,
and
the
echo
can
be
received
after
0.5
second.
Therefore,
how
deep
is
the
sea
is?
Answer:
use
both
v=λf
and
wave
propagation
to
solve
this
question.
In
different
mediums,
same
sound
waves
will
have
same
frequency.
Frequency=
vair/λair
In
the
sea:
vsea=vair(λsea/λair)=1530m/s
h
=
vsea(t/2)=1530x0.5x0.2
=
382.5m
