Science & Mathematics Questions & Answers

Science & Mathematics Questions & Answers

What are glaciers and icebergs?

You have probably been told about the huge masses of ice that exist at the north and south poles today. You may also h., have heard that thousands of years ago great tongues of ice stretched southward from the north as far as Britain and northern Europe, and that millions of years before many of countries of the southern hemisphere …

Read More »

What are galactic superclusters?

Each galaxy has billions of stars. Such galaxies are not uniformly spaced in the universe but exist in groups and clusters; a group containing up to 40-50 galaxies and clusters containing about thousands of galaxies. These along with isolated galaxies may form larger clusters known as galactic superclusters. These are the largest structures of matter found in the universe. Our …

Read More »

What are Fizeau’s fringes?

Fizeau’s fringes occur in interferometry. One of the most common methods used to test the flatness of a polished surface is by analysing the interference patterns formed when the surface is placed against another polished flat transparent surface. When two surfaces are fully in contact, a pattern of concentric dark and light circles is seen and these patterns (or fringes) …

Read More »

What are ferns?

A fern is any one of a group of about 12,000 species of plants. Unlike mosses, they have xylem and phloem (making them vascular plants). They have stems, leaves, and roots like other vascular plants. Ferns do not have either seeds or flowers (they reproduce via spores). By far the largest group of ferns are the leptosporangiate ferns, but ferns …

Read More »

What are eddy currents?

Eddy currents may be defined as currents induced in a thick conductor when it is placed in a changing electric field. Consider a metallic block placed in a continuously changing magnetic field by keeping the block fixed and changing the magnetic field with the help of an alternating current. Due to the continuous change of magnetic flux linked with the …

Read More »

What are dendrimers?

Dendrimers are repeatedly branched, roughly spherical large molecules. The name comes from the Greek word “δένδρον” (pronounced dendron), which translates to “tree”. Synonymous terms for dendrimer include arborols and cascade molecules. However, dendrimer is currently the internationally accepted term. A dendrimer is typically symmetric around the core, and often adopts a spherical three-dimensional morphology. The word dendron is also encountered …

Read More »

What are cladograms?

Cladistics is the hierarchical classification of species based on evolutionary ancestry. It’s distinct from other taxonomic classification systems because it focuses on evolution rather than similarities between species. This is because it places heavy emphasis on objective and quantitative analysis. Cladistics generates diagrams called cladograms that represent the evolutionary tree of life. The starting point of cladistic analysis is a …

Read More »