In conventional television, signals are broadcast from towers to home receivers. Even when a receiver is not in direct view of tower because of a hill or building, it can still intercept a signal if the signal diffracts enough around the obstacle, into the obstacle’s “shadow region.” Previously, television signals had a wavelength of about 50 cm, but digital television signals that are transmitted from towers have a wavelength of about 10 mm. (a) Did this change in wavelength increase or decrease the diffraction of the signals into the shadow regions of obstacles? Assume that a signal passes through an opening of 5.0 m width between two adjacent buildings. What is the angular spread of the central diffraction maximum (out to the first minima) for wavelengths of (b) 50 cm and (c) 10 mm?
In conventional television, signals are broadcast from towers to home receivers. Even when a receiver is not in direct view of tower because of a hill or building, it can still intercept a signal if the signal diffracts enough around the obstacle, into the obstacle’s “shadow region.” Previously, television signals had a wavelength of about 50 cm, but digital television signals that are transmitted from towers have a wavelength of about 10 mm. (a) Did this change in wavelength increase or decrease the diffraction of the signals into the shadow regions of obstacles? Assume that a signal passes through an opening of 5.0 m width between two adjacent buildings. What is the angular spread of the central diffraction maximum (out to the first minima) for wavelengths of (b) 50 cm and (c) 10 mm?
In conventional television, signals are broadcast from towers to home receivers. Even when a receiver is not in direct view of tower because of a hill or building, it can still intercept a signal if the signal diffracts enough around the obstacle, into the obstacle’s “shadow region.” Previously, television signals had a wavelength of about 50 cm, but digital television signals that are transmitted from towers have a wavelength of about 10 mm. (a) Did this change in wavelength increase or decrease the diffraction of the signals into the shadow regions of obstacles? Assume that a signal passes through an opening of 5.0 m width between two adjacent buildings. What is the angular spread of the central diffraction maximum (out to the first minima) for wavelengths of (b) 50 cm and (c) 10 mm?
is the minimum separation of 2 small sources of red lights on Earth that you can resolve by eye when you are flying 3.0 km above the ground? Assume the light's wavelength in air is 633 nm, the index of refraction inside the eye is 1.333 and a pupil diameter of 4.00 mm.
If a thin film has a thickness that is(a)1/4 of a wavelength, constructive interference will alwaysoccur.(b) 1/4 of a wavelength, destructive interference will alwaysoccur.(c) 1/2 of a wavelength, constructive interference will alwaysoccur.(d)1/2 of a wavelength, destructive interference will alwaysoccur.(e) None of the above is always true.
The intensity of light I through a lake at a depth of x meters is given by the following formula.
dI/dx = (-2.31)I
a.) At what depth is the intensity of the light half that of the intensity at the surface, I00?
b.) At 5 meters deep, what is the intensity of the light as a fraction of I0?
c.) How many meters deep will the intensity of light be 1 percent of the intensity of the light at the surface?
Remember that the depth at the surface is x = 0.
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