03quiz_08

03quiz_08 - Physics 9B-C 10/17/2008 Quiz #3 Name: ID-last 4:

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Physics 9B-C Quiz #3 Name: 10/17/2008 ID-last 4: A
woman
stands
at
rest
in
front
of
a
large
smooth
wall.

She
holds
a
vibrating
tuning
fork
of
 frequency
 fø
 directly
in
front
of
her
(between
her
and
the
wall.

The
woman
now
runs
toward
the
 wall
with
speed
 v w .

 Sound
waves
travel
with
speed
 v a .

 She
detects
beats
due
to
interference
 between
sound
waves
reaching
her
directly
from
the
fork
and
those
reaching
her
after
being
 reflected
from
the
wall.

 a)
(7
pts)
How
many
beats
per
second
will
she
hear?
 Use


 f L = v a ± v L v a v s f s toward away This
involves
a
double
Doppler
shift.

 The
sound
that
arrives
at
wall
and
is
reflected
(R)
is
doppler
shifted
up
in
frequency
because
the
 source,
the
woman
(L)
is
moving
toward
wall
(W).

Let
the
frequency
of
the
tuning
fork
be

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