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Unformatted text preview: Name: SID Midterm I
Physics 7C
Fall 1999
R. Packard Work all problems. Do not perform any numerical calculation until you
have a ﬁnal boxed algebraic answer. In order to obtain maximum partial
credit show all your work clearly. Work the easiest problem ﬁrst and then
move on to harder ones. If you don’t understand what is being asked in a
“ problem, ask the proctor for clariﬁcation. Good luck. ?(€(~5€ pug {a /e
dlﬁc. 5 ecﬁcu Uuwed
1. A circular loop of wire can be used to detect electromagnetic waves.
Suppose a 100MHz radio station radiates SOkW uniformly in all
directions. At the circular loop the electric ﬁeld vector is oriented in the
vertical direction. A) For maximum induced voltage in the loop what
should be the orientation of the normal to the plane of the loop?B)
What is the rms voltage that could be induced in a loop of radius 300m
at a distance of 105m from the station if the loop is oriented as
described in part A? 2. A laser beam is incident on a plate of glass of thickness 3cm and index
of refraction n=1.5. the angle of incidence is 40°. The top and bottom
surfaces of the glass are parallel and both produce reﬂected beams of
nearly the same intensity. What is the perpendicular distance d,
between the two adjacent reﬂected beams. 3. An object is 17.50m to the left of a lens of focal length f1=8.50m. A
second lens of focal length f2= 30cm is 5 cm to the right of the ﬁrst
lens. A) Find the distance between the object and the ﬁnal image. B)
What is the overall magniﬁcation? C) Is the ﬁnal image real or
virtual? Upright or inverted? Before you solve the problem
algebraically, make a ray diagram that indicates the ﬁnal image . 4. Television viewers sometimes notice that the picture ﬂickers (fades in
and out) when an airplane ﬂies across the sky in the vicinity. The
ﬂickering arises ﬁom the interference between the signal directly from
the transmitter and that reﬂected from the airplane. Suppose the TV set
is 36km from the transmitter which broadcasts at 86MHz. The airplane
is ﬂying directly overhead toward the transmitter at a height of 600m
above the receiver, and the rate of oscillation of the picture’s intensity
is 4H2. Find the speed of the plane. ...
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