Speed of sound is 330 m/s and speed of light is 300,000,000 m/s. Light travels much faster than sound that is why lightning is seen earlier and thunder is heard. https://www.tiwariacademy.com/ncert-solutions/class-8/science/chapter-13/
Speed of sound is 330 m/s and speed of light is 300,000,000 m/s. Light travels much faster than sound that is why lightning is seen earlier and thunder is heard.
Closer to roadside, larger the noise pollution. So, I would suggest a house which is three lanes away from the roadside because the pollution level (both air and noise pollution) is somewhat less there. https://www.tiwariacademy.com/ncert-solutions/class-8/science/chapter-13/
Closer to roadside, larger the noise pollution. So, I would suggest a house which is three lanes away from the roadside because the pollution level (both air and noise pollution) is somewhat less there.
Lack of sleep, hypertension (high blood pressure), anxiety and many more health disorders may be caused by noise pollution. A person who is exposed to a loud sound continuously may get temporary or even permanent impairment of hearing. https://www.tiwariacademy.com/ncert-solutions/class-8/science/chRead more
Lack of sleep, hypertension (high blood pressure), anxiety and many more health disorders may be caused by noise pollution.
A person who is exposed to a loud sound continuously may get temporary or even permanent impairment of hearing.
Major causes of noise pollution are sounds of vehicles, explosions including bursting of crackers, machines, loudspeakers etc. Sources in the home may lead to noise pollution. Television and transistor radio at high volumes, some kitchen appliances, desert coolers, air conditioners, all contribute tRead more
Major causes of noise pollution are sounds of vehicles, explosions including bursting of crackers, machines, loudspeakers etc. Sources in the home may lead to noise pollution. Television and transistor radio at high volumes, some kitchen appliances, desert coolers, air conditioners, all contribute to noise pollution.
Music is a sound which produces a pleasing sensation while noise is an unwanted and unpleasant sound. Music is produced by nature, musical instruments etc. Noise is produced by horns of vehicles, by machines etc. Music can become noise when we play it at very high volume or too many music are beingRead more
Music is a sound which produces a pleasing sensation while noise is an unwanted and unpleasant sound. Music is produced by nature, musical instruments etc. Noise is produced by horns of vehicles, by machines etc.
Music can become noise when we play it at very high volume or too many music are being played at the same time with unpleasant loudness.
Flute: Flute is a wind musical instrument which uses air column to produce sound. https://www.tiwariacademy.com/ncert-solutions/class-8/science/chapter-13/
Flute: Flute is a wind musical instrument which uses air column to produce sound.
Lightning and thunder take place in the sky at the same time and at the same distance from us. Lightning is seen earlier and thunder is heard later. Can you explain?
Speed of sound is 330 m/s and speed of light is 300,000,000 m/s. Light travels much faster than sound that is why lightning is seen earlier and thunder is heard. https://www.tiwariacademy.com/ncert-solutions/class-8/science/chapter-13/
Speed of sound is 330 m/s and speed of light is 300,000,000 m/s. Light travels much faster than sound that is why lightning is seen earlier and thunder is heard.
https://www.tiwariacademy.com/ncert-solutions/class-8/science/chapter-13/
See lessYour parents are going to buy a house. They have been offered one on the roadside and another three lanes away from the roadside. Which house would you suggest your parents should buy? Explain your answer.
Closer to roadside, larger the noise pollution. So, I would suggest a house which is three lanes away from the roadside because the pollution level (both air and noise pollution) is somewhat less there. https://www.tiwariacademy.com/ncert-solutions/class-8/science/chapter-13/
Closer to roadside, larger the noise pollution. So, I would suggest a house which is three lanes away from the roadside because the pollution level (both air and noise pollution) is somewhat less there.
https://www.tiwariacademy.com/ncert-solutions/class-8/science/chapter-13/
See lessExplain in what way noise pollution is harmful to humans.
Lack of sleep, hypertension (high blood pressure), anxiety and many more health disorders may be caused by noise pollution. A person who is exposed to a loud sound continuously may get temporary or even permanent impairment of hearing. https://www.tiwariacademy.com/ncert-solutions/class-8/science/chRead more
Lack of sleep, hypertension (high blood pressure), anxiety and many more health disorders may be caused by noise pollution.
A person who is exposed to a loud sound continuously may get temporary or even permanent impairment of hearing.
https://www.tiwariacademy.com/ncert-solutions/class-8/science/chapter-13/
See lessList sources of noise pollution in your surroundings.
Major causes of noise pollution are sounds of vehicles, explosions including bursting of crackers, machines, loudspeakers etc. Sources in the home may lead to noise pollution. Television and transistor radio at high volumes, some kitchen appliances, desert coolers, air conditioners, all contribute tRead more
Major causes of noise pollution are sounds of vehicles, explosions including bursting of crackers, machines, loudspeakers etc. Sources in the home may lead to noise pollution. Television and transistor radio at high volumes, some kitchen appliances, desert coolers, air conditioners, all contribute to noise pollution.
https://www.tiwariacademy.com/ncert-solutions/class-8/science/chapter-13/
See lessWhat is the difference between noise and music? Can music become noise sometimes?
Music is a sound which produces a pleasing sensation while noise is an unwanted and unpleasant sound. Music is produced by nature, musical instruments etc. Noise is produced by horns of vehicles, by machines etc. Music can become noise when we play it at very high volume or too many music are beingRead more
Music is a sound which produces a pleasing sensation while noise is an unwanted and unpleasant sound. Music is produced by nature, musical instruments etc. Noise is produced by horns of vehicles, by machines etc.
Music can become noise when we play it at very high volume or too many music are being played at the same time with unpleasant loudness.
https://www.tiwariacademy.com/ncert-solutions/class-8/science/chapter-13/
See lessIdentify the part which vibrates to produce sound in the following instruments: Flute
Flute: Flute is a wind musical instrument which uses air column to produce sound. https://www.tiwariacademy.com/ncert-solutions/class-8/science/chapter-13/
Flute: Flute is a wind musical instrument which uses air column to produce sound.
https://www.tiwariacademy.com/ncert-solutions/class-8/science/chapter-13/
See lessIdentify the part which vibrates to produce sound in the following instruments: Sitar
Sitar: In sitar, the stretched strings, when vibrate, they produce sound. https://www.tiwariacademy.com/ncert-solutions/class-8/science/chapter-13/
Sitar: In sitar, the stretched strings, when vibrate, they produce sound.
https://www.tiwariacademy.com/ncert-solutions/class-8/science/chapter-13/
See lessIdentify the part which vibrates to produce sound in the following instruments: Dholak
Dholak: Dholak has stretched membranes which vibrate to produce sound. https://www.tiwariacademy.com/ncert-solutions/class-8/science/chapter-13/
Dholak: Dholak has stretched membranes which vibrate to produce sound.
https://www.tiwariacademy.com/ncert-solutions/class-8/science/chapter-13/
See lessThe sound from a mosquito is produced when it vibrates its wings at an average rate of 500 vibrations per second. What is the time period of the vibration?
๐๐๐๐ ๐๐๐๐๐๐= ๐๐๐๐ ๐ก๐๐๐๐/ ๐๐ข๐๐๐๐ ๐๐ ๐๐ ๐๐๐๐๐๐ก๐๐๐๐ = 1/500 = 10 ๐ป๐ง https://www.tiwariacademy.com/ncert-solutions/class-8/science/chapter-13/
๐๐๐๐ ๐๐๐๐๐๐= ๐๐๐๐ ๐ก๐๐๐๐/ ๐๐ข๐๐๐๐ ๐๐ ๐๐ ๐๐๐๐๐๐ก๐๐๐๐ = 1/500 = 10 ๐ป๐ง
https://www.tiwariacademy.com/ncert-solutions/class-8/science/chapter-13/
See lessA pendulum oscillates 40 times in 4 seconds. Find its time period and frequency.
๐๐๐๐ ๐๐๐๐๐๐= ๐๐๐๐ ๐ก๐๐๐๐/ ๐๐ข๐๐๐๐ ๐๐ ๐๐ ๐๐๐๐๐๐ก๐๐๐๐ = 4/40 = 0.1 ๐ ๐๐๐๐๐๐ ๐น๐๐๐๐ข๐๐๐๐ฆ= ๐๐ข๐๐๐๐ ๐๐ ๐๐ ๐๐๐๐๐๐ก๐๐๐๐ / ๐๐๐๐ ๐ก๐๐๐๐ = 40/4 = 10 ๐ป๐ง https://www.tiwariacademy.com/ncert-solutions/class-8/science/chapter-13/
๐๐๐๐ ๐๐๐๐๐๐= ๐๐๐๐ ๐ก๐๐๐๐/ ๐๐ข๐๐๐๐ ๐๐ ๐๐ ๐๐๐๐๐๐ก๐๐๐๐ = 4/40 = 0.1 ๐ ๐๐๐๐๐๐
๐น๐๐๐๐ข๐๐๐๐ฆ= ๐๐ข๐๐๐๐ ๐๐ ๐๐ ๐๐๐๐๐๐ก๐๐๐๐ / ๐๐๐๐ ๐ก๐๐๐๐ = 40/4 = 10 ๐ป๐ง
https://www.tiwariacademy.com/ncert-solutions/class-8/science/chapter-13/
See less