Science & Mathematics Questions & Answers

Uranium dating is one of the ways of determining the age of ancient objects, even one million years old, by measuring how much of the following are present in them: the amount of radioactive isotopes of uranium, and the amount of other materials into which the radioactive isotopes would decompose. These measurements, when combined with knowledge about the initial state …

Universal Time Coordinated (UTC) is a time standard based on International Atomic Time with leap seconds added at irregular intervals to compensate for the Earth’s slowing rotation. A leap second is a positive or negative one-second adjustment to the UTC scale that keeps it close to Mean Solar Time at the Royal Observatory, Greenwich. The difference between UTC and Mean …

The presence of micro cracks on the glass surface (called Griffith’s micro cracks) makes glass breakable under tension or impact. Such micro cracks are unavoidable as the glass surface comes under tension while cooling from a high temperature into various shapes. However, one can increase its impact resistance by various methods, so it can withstand even the impact of a …

It is a term used in grafting of plants. For the whip and tongue graft, similar cuts are made on the stock and scion. These are made with a single draw of the knife and have a smooth surface so the two can develop a good graft union.

In the theory of special relativity, the slowing down of a clock as determined by an observer who is in relative motion with respect to that clock, is called time dilation. In this phenomenon, a person finds a clock (or other time device) similar or identical to their own, ticking at a slower pace, making the observer believe that time …

Thigmotropism is the growth of a plant around a support. Tropism is a phenomena by which a plant, usually climber like money plant and ivy, responds to a stimulus. Stems of the pea plant, for instance, are weak and have coil-like structures called tendrils. When tendrils approach a support (stick), a phytohormone called auxin is released in the side of …

Yuppie flu, which is also called the shirkers’ syndrome, is a term cynically applied to those suffering from chronic fatigue syndrome. Earlier, doctors and others believed symptoms of chronic fatigue such as sleep disorders and other severe problems to be imagined. But now, scientists are linking the yuppie flu to gene mutations.

In the South Atlantic Ocean, about half way between Africa and South America, are the British islands of Tristan da Cunha. Their nearest neighbour is St Helena, another British island 2,120km (1,317 miles) away. In 1961, a volcanic eruption forced the Tristan islanders to leave for Britain. But life in crowded Britain lacked appeal and most of them went home …

A sharp rise in aerodynamic drag, occurs when a plane reaches the speed of sound. For an aircraft flying at subsonic speed, the pressure waves generated by it extend in all directions, and, outspeeding the craft, transmit the disturbance uniformly. However, for supersonic speeds, the pressure field is confined to an area extending in a Mach cone from the rear …

As you stand in the middle of a playground or while you are sitting in your class, there is an immense weight right over your head, but you do not feel it! This is the weight of the atmosphere, or air, as we know it. Composed of nitrogen, oxygen, carbon dioxide and other gases, it surrounds the earth like an …