Write short note on the following:
a.Echo
b.Hercules
It's urgent..........
Answers
a. the repetition of a sound caused by reflection of sound waves is called echo
b. a mythical Greek hero renowned for his great strength and especially for performing 12 labors imposed on him by Hera
Answer:
Explanation:
1. echo
In audio signal processing and acoustics, echo is a reflection of sound that arrives at the listener with a delay after the direct sound. The delay is directly proportional to the distance of the reflecting surface from the source and the listener. Typical examples are the echo produced by the bottom of a well, by a building, or by the walls of an enclosed room and an empty room. A true echo is a single reflection of the sound source.[citation needed]
The word echo derives from the Greek ἠχώ (ēchō),[1] itself from ἦχος (ēchos), "sound".[2] Echo in the Greek folk story is a mountain nymph whose ability to speak was cursed, leaving her able only to repeat the last words spoken to her. Some animals use echo for location sensing and navigation, such as cetaceans (dolphins and whales) and bats.
2. hercules
Hercules (known in Greek as Heracles or Herakles) is one of the best-known heroes in Greek and Roman mythology. His life was not easy–he endured many trials and completed many daunting tasks–but the reward for his suffering was a promise that he would live forever among the gods at Mount Olympus.
Early Life
Hercules had a complicated family tree. According to legend, his father was Zeus, ruler of all the gods on Mount Olympus and all the mortals on earth, and his mother was Alcmene, the granddaughter of the hero Perseus. (Perseus, who was also said to be one of Zeus’ sons, famously beheaded the snake-haired Gorgon Medusa.)
Did you know? The constellation Hercules is the fifth-largest one in the sky.
Hera’s Revenge
Hercules had enemies even before he was born. When Zeus’ wife Hera heard that her husband’s mistress was pregnant, she flew into a jealous rage. First, she used her supernatural powers to prevent the baby Hercules from becoming the ruler of Mycenae. (Though Zeus had declared that his son would inherit the Mycenaean kingdom, Hera’s meddling meant that another baby boy, the feeble Eurystheus, became its leader instead.) Then, after Hercules was born, Hera sent two snakes to kill him in his crib. The infant Hercules was unusually strong and fearless, however, and he strangled the snakes before they could strangle him.
But Hera kept up her dirty tricks. When her stepson was a young adult, she cast a kind of spell on him that drove him temporarily insane and caused him to murder his beloved wife and their two children. Guilty and heartbroken, Hercules tracked down Apollo, the god of truth and healing (and another of Zeus’ sons), and begged to be punished for what he had done.