Physics Assignment( REG 20 )

1)How many images would you get for an object that is placed between two mirrors placed at an angle less than 90 degrees?

-It will reflect more than 3 images

2) What happens to the images of this angle if it is bigger than 90 degrees?

-Lesser than 3 images will be formed.

3)how do mirrors produce funny images?

It usually depends on how the mirror bend, like convex and concave.Convex bends outward while concave bends inward .It can be usually found in a convenient store as it used to let the store owner to see if there any shoplifter as it can reflect the image of the whole shop.

Chemistry graded assignment(REG 20)

1 ) Microwaved food is believed to contain microwaves. How safe is microwaved food ?
It is not very safe as they discovered that eating microwaved food, over time, causes significant changes in blood chemistry, a decrease in hemoglobin and cholesterol values, in the HDL (good cholesterol) versus LDL (bad cholesterol) ratio and in white blood cells, weakening the immune system, and an increase in leukocyte levels, which tends to indicate poisoning and cell damage.


(2) Reports have linked charred food to cancer. How safe is BBQ food ?
Benz pyrenes are carcinogenic particles found in charred foods. Based on studies with laboratory rats, scientists found that ingesting large amounts of benz pyrenes may cause cancer.

From: http://www.bbqmyths.com/grilledfoods.html
http://en.wikipedia.org/wiki/Microwave_oven

E Learning Part 2(Reg 11-20)

What would be the effect if a spaceship landed, and the aliens in it estimate that they are 400 years ahead of us. What would happen if they offered us all their scientific knowledge? Would it be good or bad? Why?

I think that it can be bad or the other way round as it may be good to have a very modern technology that was from 4oo years ahead of us but did we think about what will happen to the Earth if we were to have such modern scientific technology? Will the technology cause more harm to the Earth? If were to cause more harm to the Earth and cause the lifespan of the Earth to shortened, i will think that it is bad and i rather not have such technolgy.

E-learning Part 1(Invention of Television)

In 1884 Paul Gottlieb Nipkow, a 23-year old university student in Germany, patented the first electromechanical television system which employed a scanning disk, a spinning disk with a series of holes spiraling toward the center, for rasterization. The holes were spaced at equal angular intervals such that in a single rotation the disk would allow light to pass through each hole and onto a light-sensitive selenium sensor which produced the electrical pulses. As an image was focused on the rotating disk, each hole captured a horizontal "slice" of the whole image.
Nipkow's design would not be practical until advances in amplifier tube technology became available. The device was only useful for transmitting still "halftone" images — represented by equally spaced dots of varying size — over telegraph or telephone lines. Later designs would use a rotating mirror-drum scanner to capture the image and a cathode ray tube (CRT) as a display device, but moving images were still not possible, due to the poor sensitivity of the selenium sensors. In 1907 Russian scientist Boris Rosing became the first inventor to use a CRT in the receiver of an experimental television system. He used mirror-drum scanning to transmit simple geometric shapes to the CRT.
Scottish inventor John Logie Baird demonstrated the transmission of moving silhouette images in London in 1925, and of moving, monochromatic images in 1926. Baird's scanning disk produced an image of 30 lines resolution, just enough to discern a human face, from a double spiral of lenses. Remarkably, in 1927 Baird also invented the world's first video recording system, "Phonovision" — by modulating the output signal of his TV camera down to the audio range he was able to capture the signal on a 10-inch wax audio disc using conventional audio recording technology. A handful of Baird's 'Phonovision' recordings survive and these were finally decoded and rendered into viewable images in the 1990s using modern digital signal-processing technology.