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In conventional television, signals are broadcast from towers to home receivers. Even when a receiver is not in direct view of a 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". Current television signals have a wavelength of about 50 cm, but future digital television signals that are to be transmitted from towers will have a wavelength of about 10 mm. Assume that a signal passes through an opening of 4.23 m width between two adjacent buildings. What is the angular spread of the central diffraction maximum (out to the first minimum) for wavelengths of:
(a) 50 cm
(b) 10 mm
A black, totally absorbing piece of cardboard of area A = 3.0 cm2 intercepts light with an intensity of 3.9 W/m2, What radiation pressure is produced on the cardboard by the light
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the observer is positioned so that the far edge of the bottom of the empty glass is just visible. when the glass is
An RL circuit has a 5 kO resistor and a 1 mH inductor. This circuit is driven by a 100 Hz sine wave with 1 V amplitude. What is the amplitude of the current in the circuit
At a market a bunch of bananas are set on a spring scale tomeasure their weight. What is the massof the bananas
a proton is located at the origin and a second proton is located on the x-axis at x 6.78 fm 1 fm 10-15 m.a calculate
Point charges of 6.2*10^-8 C and -6.4*10^-8 C are placed 72 cm apart. A third point charge of 6.3*10^-8 C is placed half way between the first two point charges
The rms value of the electric field in an electromagnetic wave is Erms = 480 V/m. Find the average energy density
While on vacation a tourist left the center of town in a rented car having an odometer reading of 26725.10 km. He traveled south of west of 6.00 h and then swung northeast for 14.0 h, ending up 420 km due east of the center of town. At that point ..
a circus clown weighing 170 lbs. is fired from a cannon at 50 degrees above the horizontal. The clown lands in a circular net that has a radius of 15 ft. What was the initial velocity of the clown
A ship sailing in the Gulf Stream is heading 25° west of north at a speed of 4.00 m/s relative to the water. What is the velocity of the Gulf Stream
If I eat 500g of something which is 700Bq/kg, with a half life (biological and physical) of 55 days, what is the dose and effective dose on someone who is 70kg.
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