Showing posts from July, 2019

Photoelectric effect: Definition, Properties and Applications

Welcome to Sciencedoze. Today we will learn about Photoelectric effect in detail. This article consists Photoelectric effect, It's properties, Einstein's theory of Photoelectric effect and applications of Photoelectric effect. So let's begin!! What is Photoelectric Effect? The phenomenon of emission of electrons from a metal surface, when electromagnetic radiations of sufficiently high frequency are incident on it, is called photoelectric effect. The photo (light)- generated electrons are called photoelectrons. What are the Laws of Photoelectric Emission? On the basis of the experimental results on photoelectric effect, Lenard and millikan gave the following laws of the photoelectric emission: For a given photosensitive material and frequency of incident radiation, (above the threshold frequency), the photoelectric current is directly proportional to the intensity of light. The saturation current is directly proportional to the intensity of incident ra

Chandrayaan 2 mission: India's Pride

How will Chandrayaan 2 Study the Moon? When Chandrayaan-1, India's first moon mission was launched on October 22, 2008 from Sriharikota using the polar satellite launch vehicle (PSLV), India became the fourth country to plant its flag on the lunar surface. On the moon, the mission conclusively detected traces of water along with magnesium, aluminium and silicon. Now, close to decade later, India will launch its second lunar mission, Chandrayaan 2 , on July 22, 2019 again from sriharikota using the Geosynchronous satellite launch vehicle (GSLV) Mark lll rocket. The launch falls a day short of the 50th anniversary of the launch of the American mission Apollo 11 which took humans to the moon and back. The first moon landing occurred on July 20, 1969, on the Apollo 11 mission which was launched on July 16. How will the Launch Work? The GSLV Mark lll rocket will first launch the spacecraft into an Earth parking orbit (170 Km×40,400 Km). Then the height of the orb

Why Indelible ink lasts so long on finger?

The indelible ink lasts so long on finger because the chemical used in indelible inks is Silver nitrate . When we put it on the skin, Silver nitrate reacts with the salt present on our skin and form Silver chloride which is insoluble in water , and sticks to the skin. How to remove indelible ink from skin? Indelible ink cannot be washed off with soap and water. It cannot be washed even with hot water, alcohol, nail polish remover, or bleach. The indelible ink will disappear as the old skin cells die and get replaced by a new one. Where is indelible ink manufactured in India? Mysore Paints and Varnish Limited is a company located in the city of Mysore, India where indelible ink is manufactured. It is the only company in India authorized to produce the indelible ink, which is used in the elections to prevent people from voting multiple times.

What would happen if we live on mars

What would happen if we live on mars? We can't live freely on mars as we today live on earth. We can't talk, walk ,and eat freely as we do on earth. In short, our life will be hell. Here are the reasons why? Time to travel If we board on the fastest space ship even then it would take around 40 days to 270 days to travel from earth to mars, depending upon the position of mars in the orbit. Breathing We can't breathe freely as there is only 0.14% of the oxygen on Mars. We have to carry excess oxygen from earth or we have to find an effective way to produce oxygen from Co2 as it is a major part of mars. Weather Mars is a global desert filled with infertile dry sand. The temperature on mars can drop down to -55°C to -123°C which unbearable for humans. Also, heavy dust storms are common on Mars. Radiations As mars have no magnetic field and the ozone layer. So we can't bear the UV radiations of the sun and can't move freely like on earth. Cha