Measuring Speed by Radar. A baseball coach uses a radar device to measure the speed of an approaching pitched baseball. This device sends out electromagnetic waves with frequency f 0 and then measures the shift in frequency Δ f of the waves reflected from the moving baseball. If the fractional frequency shift produced by a baseball is Δ f / f 0 = 2.86 × 10 −7 , what is the baseball’s speed in km/h? ( Hint: Are the waves Doppler-shifted a second time when reflected off the ball?)
Measuring Speed by Radar. A baseball coach uses a radar device to measure the speed of an approaching pitched baseball. This device sends out electromagnetic waves with frequency f 0 and then measures the shift in frequency Δ f of the waves reflected from the moving baseball. If the fractional frequency shift produced by a baseball is Δ f / f 0 = 2.86 × 10 −7 , what is the baseball’s speed in km/h? ( Hint: Are the waves Doppler-shifted a second time when reflected off the ball?)
Measuring Speed by Radar. A baseball coach uses a radar device to measure the speed of an approaching pitched baseball. This device sends out electromagnetic waves with frequency f0 and then measures the shift in frequency Δf of the waves reflected from the moving baseball. If the fractional frequency shift produced by a baseball is Δf/f0 = 2.86 × 10−7, what is the baseball’s speed in km/h? (Hint: Are the waves Doppler-shifted a second time when reflected off the ball?)
Interaction between an electric field and a magnetic field.
disks have
planes
that are
parallel and centered
Three polarizing
On a common axis. The direction of the transmission axis
Colish dashed line) in each case is shown relative to the common
vertical direction. A polarized beam of light (with its axis
of polarization parallel to the horizontal reference direction)
is incident from the left on the first disk with int
intensity
So = 790 W/m². Calculate the transmitted intensity if 81=28.0°
O2-35.0°, and O3 = 40.0°
w/m²
horizontal
Өз
02
A polarized light is incident on several polarizing disks whose planes
are parallel and centered on common axis. Suppose that the transmission
axis of
the first polarizer is rotated 20° relative to the axis of polarization
of the incident
and that the transmission axis
of
each
exis of
light,
additional analyzer is rotated 20° relative to the transmission axis
the previous one. What is the minimum number of polarizer
needed (whole number), so the transmitted light through all
polarizing sheets has an
Striking
intensity that is less then 10% that
the first polarizer?
A high energy pulsed laser emits 1.5 nano second-long pulse of
average power 1.80x10" W. The beam is cylindrical with 2.00 mm
in radius. Determine the rms value of the B-field?
-T
Chapter 37 Solutions
University Physics with Modern Physics (14th Edition)
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