Q1- A cell phone broadcasts 800 MHz signal. If it is operated from the space between two massive radio-wave absorbing buildings with 15 m space between them, what is the angular width of the electromagnetic wave after it emerges from between the buildings?
Q2- How far behind the pinhole should the viewing screen be placed to photograph a circular diffraction pattern with central maxima of diameter of 1.0 cm, if the wavelength of the light used is 633 nm and the diameter of the pinhole is 0.12 mm.
Comments