If
the
frequency
were
to
change,
the
two
media
could
not
stay
in
contact
with
each
other.
If
one
medium
vibrates
with
a
certain
frequency,
and
the
other
medium
vibrates
with
a
different
frequency,
then
particles
from
the
two
media
initially
in
contact
could
not
stay
in
contact
with
each
other.
But
particles
must
be
in
contact
in
order
for
the
wave
to
be
transmitted
from
one
medium
to
the
other,
and
so
the
frequency
does
not
change.
Since
the
wave
speed
changes
in
passing
from
air
into
water,
and
the
frequency
does
not
change,
we
expect
the
wavelength
to
change.
The
wave
travels
about
four
times
faster
in
water,
so
we
expect
the
wavelength
in
water
to
be
about
four
times
longer
than
it
is
in
air.
Ifthefrequencyweretochange,thetwomediacouldnotstayincontactwitheachother.Ifonemediumvibrateswithacertainfrequency,andtheothermediumvibrateswithadifferentfrequency,thenparticlesfromthetwomediainitiallyincontactcouldnotstayincontactwitheachother.Butparticlesmustbeincontactinorderforthewavetobetransmittedfromonemediumtotheother,andsothefrequencydoesnotchange.Sincethewavespeedchangesinpassingfromairintowater,andthefrequencydoesnotchange,weexpectthewavelengthtochange.Thewavetravelsaboutfourtimesfasterinwater,soweexpectthewavelengthinwatertobeaboutfourtimeslongerthanitisinair.
การแปล กรุณารอสักครู่..
If
the
frequency
were
to
change,
the
two
media
could
not
stay
in
contact
with
each
other.
If
one
medium
vibrates
with
a
certain
frequency,
and
the
other
medium
vibrates
with
a
different
frequency,
then
particles
from
the
two
media
initially
in
contact
could
not
stay
in
contact
with
each
other.
But
particles
must
be
in
contact
in
order
for
the
wave
to
be
transmitted
from
one
medium
to
the
other,
and
so
the
frequency
does
not
change.
Since
the
wave
speed
changes
in
passing
from
air
into
water,
and
the
frequency
does
not
change,
we
expect
the
wavelength
to
change.
The
wave
travels
about
four
times
faster
in
water,
so
we
expect
the
wavelength
in
water
to
be
about
four
times
longer
than
it
is
in
air.
การแปล กรุณารอสักครู่..