Question

Suppose that there are four entrances into a planetarium and a sensor is placed at each entrance to detect the number of people entering through a particular entrance. A maximum of four people can enter through each entrance. The occupancy of the room can not exceed twelve. For the show to start at the scheduled time, there has to be at least one person present. Assume that the people are not allowed to leave the room until the show ends. Design a combination circuit which signals the start of the show. The marks distribution is shown below. a. Truth Table b. Karnaugh Map Minimization c. Circuit diagram

Answer 1

Answer:

A sensor is exposed for time t to a lamp of power P placed at a distance l. The sensor has an opening that is 4d in diameter. Assuming all energy of the lamp is given off as light, the number of photons entering the sensor if the wavelength of light is λ is