The doppler effect changes the wavelength of the light emitted, depending upon whether source is moving away or coming towards the detector.
Doppler effect in light is actually a relativistic effect (caused due to relativistic time dilaton and can be explained by special theory of relativity) but somewhat similar to the one which happens in sound waves. This effect has nothing to do with the bending in spacetime.
When the source is moving away from the detector, the wavelength of the light emitted from the source appears to be increased as seen by the detector (think of a wave being stretched), as a result the frequency decreases (since, speed of light is constant in all frames). Due to this decrease in frequency the light emitted from the source appears more red (since red color is on low frequency side in the electromagnetic spectrum) compared to the situation when source was at rest.
Vice versa for the source moving towards the detector
This shift in frequency is also known as doppler shift.
The shift in frequency when the source is moving away is known as redshift and the opposite one is known as blueshift.
Traditionally, a great diversity of materials have been used in the creation of African art, mostly of natural origin. Wood is the most frequent, and unusual stone. For the creation of sculptures, brass and bronze were used, while iron and iron were used for the manufacture of tools and weapons. TEXTILES Textiles, in addition to covering the body, are a symbol of social, economic or ritual prestige. The fabrics are usually made by men, who use vegetable fibers (linen, jute or raffia), cotton, silk and wool. Instead, women are responsible for decorating through embroidery or applications.
Symbol is social distinction are also bracelets, necklaces, anklets or belts. Made with glass beads, shells, feathers, mollusks ...
CLAY. Older material, known since the 9th century B.C. The land is collected on the banks of the rivers and for its modeling the lathe is not used, the pieces are made by hand. The most common technique is that of ‘churros’; overlay of long clay cylinders that will later be decorated with incisions, embossed motifs or color application with vegetable and mineral pigments. After days of drying, the objects are cooked in outdoor pits.
Answer:
Rabi, Kharif, Zaid.
Explanation:
India has three cropping seasons:- rabi, kharif and zaid. Rabi crops are sown in winter from October to December and harvested in summer from April to June. Some of the important rabi crops are wheat, barley, peas, gram and mustard.