A filter is a circuit designed to pass AC signals in some frequency range and to attenuate others. Common filters include low-pass filters , which allow low-frequency signals to pass but attenuate high frequencies; high-pass filters , which do the opposite; and band-pass filters, which pass a range of frequencies while attenuating signals with frequencies outside the band. Filters are widely used in electronics. Applications include tone and equalizer controls in audio equipment; filters to separate nearby frequencies at cell phone towers; and filters to eliminate unwanted electrical noise in biomedical instruments such as electrocardiographs. A simple design for an RC filter is shown in Fig. 28.27. Figure 28.27 An RC filter (Passage Problems 73–76) 73. The circuit shown in Fig. 28.27 is a. a low-pass filter. b. a high-pass filter. c. a band-pass filter. d. impossible to tell without knowing the component values. in series with the output, whereas in this case it is in parallel.
A filter is a circuit designed to pass AC signals in some frequency range and to attenuate others. Common filters include low-pass filters , which allow low-frequency signals to pass but attenuate high frequencies; high-pass filters , which do the opposite; and band-pass filters, which pass a range of frequencies while attenuating signals with frequencies outside the band. Filters are widely used in electronics. Applications include tone and equalizer controls in audio equipment; filters to separate nearby frequencies at cell phone towers; and filters to eliminate unwanted electrical noise in biomedical instruments such as electrocardiographs. A simple design for an RC filter is shown in Fig. 28.27. Figure 28.27 An RC filter (Passage Problems 73–76) 73. The circuit shown in Fig. 28.27 is a. a low-pass filter. b. a high-pass filter. c. a band-pass filter. d. impossible to tell without knowing the component values. in series with the output, whereas in this case it is in parallel.
A filter is a circuit designed to pass AC signals in some frequency range and to attenuate others. Common filters include low-pass filters, which allow low-frequency signals to pass but attenuate high frequencies; high-pass filters, which do the opposite; and band-pass filters, which pass a range of frequencies while attenuating signals with frequencies outside the band. Filters are widely used in electronics. Applications include tone and equalizer controls in audio equipment; filters to separate nearby frequencies at cell phone towers; and filters to eliminate unwanted electrical noise in biomedical instruments such as electrocardiographs. A simple design for an RC filter is shown in Fig. 28.27.
Figure 28.27 An RC filter (Passage Problems 73–76)
73. The circuit shown in Fig. 28.27 is
a. a low-pass filter.
b. a high-pass filter.
c. a band-pass filter.
d. impossible to tell without knowing the component values.
in series with the output, whereas in this case it is in parallel.
!
Required information
The radius of the Moon is 1.737 Mm and the distance between Earth and the Moon is 384.5 Mm.
The intensity of the moonlight incident on her eye is 0.0220 W/m². What is the intensity incident on her retina if the
diameter of her pupil is 6.54 mm and the diameter of her eye is 1.94 cm?
W/m²
Required information
An object is placed 20.0 cm from a converging lens with focal length 15.0 cm (see the figure, not drawn to scale). A
concave mirror with focal length 10.0 cm is located 76.5 cm to the right of the lens. Light goes through the lens, reflects
from the mirror, and passes through the lens again, forming a final image.
Converging
lens
Object
Concave
mirror
15.0 cm
-20.0 cm-
10.0 cm
d cm
d = 76.5.
What is the location of the final image?
cm to the left of the lens
!
Required information
A man requires reading glasses with +2.15-D refractive power to read a book held 40.0 cm away with a relaxed eye.
Assume the glasses are 1.90 cm from his eyes.
His uncorrected near point is 1.00 m. If one of the lenses is the one for distance vision, what should the refractive power of the other
lens (for close-up vision) in his bifocals be to give him clear vision from 25.0 cm to infinity?
2.98 D
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