You will write a racing report program using object-oriented programming with three classes:
reportdriver, racereport, and race. the main method of the program will be in the
class reportdriver and will include a loop that allows you to enter in more than one race and
have reports written out for all the races you enter. (the user will enter one race then get a report
for that race. after that, the user will be asked whether they want to enter in another race and get
another report. this repeats until the user says they do not want to enter in any more races.)

program description

there are two major tasks in this assignment. your first major task is to write a program that
collects three pieces of user input about a race and provides a summary of facts about the race.
input will be via the keyboard and output (i. e., the summary of facts) will be via the display
(a. k.a., console window). the three pieces of user input will be the three individual race times
that correspond the first, second, and third top race finishers; your program will prompt the user to
enter these in via the keyboard. note that you cannot assume these times will be in order; putting
them in order is one of the first things your program should do. thus, your program will need to

do the following:

1. prompt the user for three ints or doubles, which represent the times for the three racers.
2. sort the three scores into ascending order (i. e., least to greatest).
(a) remember, to swap two variables requires a third, temporary variable.
(b) see the math class (documented in savitch ch. 5; see the index for the exact location
. . this is good practice for looking things up) for methods that might you (e. g.,
min and max). note that these methods produce a return value.

(c) output the sorted race scores in order.

3. describe the overlap in times, if any exist. the options will be:
(a) all are tied for first.
(b) some are tied for first.
(c) none are tied for first.

Mri is one what are your options anyway ?

Infrared sensor is most used sensor in wireless technology where remote controlling functions and detection of surrounding objects/ obstacles are involved. this post will discuss about what is infrared sensor, its working principle, how it works, types, applications, advantages and disadvantages. what is infrared sensor

ir sensor is a simple electronic device which emits and detects ir radiation in order to find out certain objects/obstacles in its range. some of its features are heat and motion sensing.

ir sensors use infrared radiation of wavelength between 0.75 to 1000µm which falls between visible and microwave regions of electromagnetic spectrum. ir region is not visible to human eyes. infrared spectrum is categorized into three regions based on its wavelength i.e. near infrared, mid infrared, far infrared.

wavelength regions of infrared spectrum

near ir – 0.75µm to 3 µm
mid ir – 3 µm to 6 µm
far ir – > 6 µm
1 introduction to infrared sensor

fig. 1 – introduction to infrared sensor

working principle of infrared sensor

infrared sensors works on three fundamental physics laws:

planck’s radiation law: any object whose temperature is not equal to absolute zero (0 kelvin) emits radiation.
stephan boltzmann law: the total energy emitted at all wavelengths by a black body is related to the absolute temperature.
wein’s displacement law: objects of different temperature emit spectra that peak at different wavelengths that is inversely proportional to temperature.
key elements of infrared detection system

the key elements of infrared detection system are:

ir transmitter

ir transmitter acts as source for ir radiation. according to plank’s radiation law, every object is a source of ir radiation at temp t above 0 kelvin. in most cases black body radiators, tungsten lamps, silicon carbide, infrared lasers, leds of infrared wavelength are used as sources.

transmission medium

as the name suggests, transmission medium provides passage for the radiation to reach from ir transmitter to ir receiver. vacuum, atmosphere and optical fibers are used as medium.

ir receiver

generally ir receivers are photo diode and photo transistors. they are capable of detecting infrared radiation. hence ir receiver is also called as ir detector. variety of receivers are available based on wavelength, voltage and package.

ir transmitter and receivers are selected with matching parameters. some of deciding specifications of receivers are photosensitivity or responsivity, noise equivalent power and detectivity.