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Hademenos G.J. (eds.) Schaum's easy outlines.. Applied physics crash course (McGraw-Hills, 2003)(200dpi(K)(200dpi)(T)(146s)_P_.djvu |
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Astronomers use the Doppler effect in light to de-
determine the motion of stars; police use the effect in
radar waves to determine vehicle velocities...
Since a positive charge going one way is, for
most purposes, equivalent to a negative charge going the other way, this
assumption makes no practical difference...
The equivalent capacitance of a set
of capacitors joined in series (Figure 14-1) is
1111
— = — + —+— +
capacitors in series
If there are only two capacitors in series,
1 1 1 Г +C
and so С =
Q+c2
In a parallel set of capacitors (Figure 14-2),
С = Q + C2 + C3 + • • • capacitors in parallel
Solved Problem 14.1 Find the equivalent capacitance of three capaci-
capacitors whose capacitances are 1, 2, and 3 uF that are connected in: (a) se-
series and (b) parallel...
The mag-
magnitude of В is equal numerically to the force on a charge of 1 С moving
at 1 m/s perpendicular to B...
Similarities: Both fields originate in electric charges, and both fields
can exert forces on electric charges...
The minus sign indicates that the direction of V is such as to oppose the
change in current A/ that caused it...
Electrons oscillating back and forth in an antenna give
off radio waves, for instance, and accelerated electrons in atoms give off
light waves...
The illumination on a surface a distance R away from an isotropic
source of light of intensity / is
E =
I cos в
R
where 0 is the angle between the direction of the light and the normal to
the surface (Figure 17-3)...
Refraction of Light
When a beam of light passes obliquely from one medium to another in
which its velocity is different, its direction changes (Figure 17-6)...
A positive focal length corresponds to a converging lens and a neg-
negative focal length to a diverging lens...
This image then serves as
the object for the second lens, with the usual sign convention: If the im-
image is on the front side of the second lens, the object distance is consid-
considered positive, whereas if the image is on the back side, the object distance
is considered negative...
The angular width in radians of the image disk of
a point source is about
0o=A.22)f|
CHAPTER 20: Physical and Quantum Optics 133
where X is the wavelength of the light and D is the lens or mirror diame-
diameter...
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