The sound that has pleasant effect on ears is called ______ .
2) ________ is the surest test for magnetism.
3) Speed of sound is slowest in _______ .
4) Sound propagates in air as _______ waves.
5) An atom is electrically ______.
Answers
1) Music
2) Repulsion
3) Gases
4) Longitudinal
5) Neutral
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Answer:
music
repulsion
gases
longitudinal waves
neutral
Explanation:
1.Sounds that are unpleasing and disturbing to the ears are called noise, whereas, the pleasing and comforting to the ears are called music, like those produced by musical instruments.
2.Attraction can be caused either by opposite poles of magnets or between one pole of magnet and an unmagnetised bar of iron whereas repulsion is possible between the two similar poles of magnets. Hence, repulsion is the surest test of magnetism.
3.the speed of sound varies from substance to substance: typically sound travels most slowly in gases, faster in liquids, and faster still in solids.
4.Sound waves traveling through air are indeed longitudinal waves with compressions and rarefactions. As sound passes through air (or any fluid medium), the particles of air do not vibrate in a transverse manner. Do not be misled - sound waves traveling through air are longitudinal waves
5.Atoms are electrically neutral because they have equal numbers of protons (positively charged) and electrons (negatively charged). If an atom gains or loses one or more electrons, it becomes an ion. If it gains one or more electrons, it now carries a net negative charge, and is thus "anionic.