We can also say that in this case, particles of the medium oscillate along the direction of propagation of the wave. The number of oscillations per second is called the frequency of oscillation. Veena and sitar are examples of _______ instruments. Sketch larynx and explain its function in your own words. Answer: ……………… of any kind is the principle source of production of sound. Multiple Choice Questions The more the amplitude of vibration, louder the sound. Sonogram is not harmful and is therefore used for studying the foetus or stone or tumor in the organs. For example. 1. In our body which part of the ear receives sound waves ? Loudness of sound is expressed in Audible sound: It is the range of the frequency of sound that can be heard by humans. There are two types of sound which are as follows: It is the sound that gives pleasant effect or soothing effect. The NCERT Solutions to the questions after every unit of NCERT textbooks aimed at helping students solving difficult questions.. For a better understanding of … Ears have a stretched structure called ear drum. KS2 Science Sound and vibration learning resources for adults, children, parents and teachers. The internal ear has cochlea which is filled with a fluid and having tiny hair cells inside. } Top, It is the distance between two consecutive crests or troughs. What are ultrasounds ? The lesser the amplitude of vibration, the sound gets feeble. 2. The worksheets are useful for KS3 students, especially Year 8 students to revise and master the topic. While some of these sounds may be pleasant and soothing, some could be annoying. 70% average accuracy. (d) it has any of the three characteristics listed above. or 10 Hz. Now bang the spoon on the tumbler and hear the sound produced again. Lightning is seen earlier and thunder is heard later. Sound needs a material medium for its propagation. 5. Now take a pencil and strike the bowls gently. 2. What change do you observe on the surface of water? It is the speed with which sound travels. Time taken by an object to complete one oscillation is called _______. Light can travel through vaccum. Lightning is seen earlier and thunder is heard later. Amplitude is the maximum displacement of a particle from its mean position in either direction. The outer and middle ears mostly collect and transmit sound. c) Lower than 20,000 Hz. Very Short Answer Type Questions. Question 8. - Phys Sci. Sound waves do not travel through which of the following? But as we start removing air by means of vacuum pump, the sound of ringing bell goes on becoming fainter or lighter. Musical Instrument: An instrument that produce a musical sound. These instruments are mainly made of brass and wood but sometimes they can be made of silver. Activity 2 (NCERT Textbook, Page 758) Sound is a form of energy that produces sensation of hearing. In which medium sound propagates the maximum? Solution: The vocal cords in men are about 20 mm long. Jake a rubber band. Question: What is the name the substance which vibrates in a flute to produce sound? Can you explain why ? We can control noise pollution by designing and installing silencing devices in machines. Let us suppose if there is any marriage party going on in our surroundings and they use loud speakers. There are different characteristics of sound which are as follows: It is a characteristic of sound, the degree of sensation of sound. 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They have been offered one on the roadside and another three lanes away from the roadside. It is defined as the contamination of air with unpleasant and irritable effect. It is the wave in which particles vibrate up and down. IXL offers more than 100 eighth grade science skills to explore and learn! How are we able to hear sound ? 8. Ultrasound scans produce sounds in this range. Thus, due to more speed of light it reaches us before sound. a) Higher than 20,000 Hz. In which case is the amplitude larger? Make sure it does not touch the body of bucket. When lung force air through the slit, the vocal cords vibrate, producing sound. Educational Study Material. Top. Noise pollution causes: It is the property that determines the shrillness (sharpness) or depth of sound. 6. So, transfer of sound energy occurs faster. (ii) Sound helps us communicate with each other. d) No relation between amplitude and sound 8 Human can hear sound in the range of. The book is available in all English, Hindi & Urdu Medium. Bats produce ultrasonic sound during screaming. Answer: Astronomers fail to hear the sound of each other while they are on the surface of the moon because there is no air present on the moon and we know that sound cannot travel through vacuum. They all differ due to the varied length of air column. Explain how the sound travels. Community law enforcers should check the misuse of loudspeakers, processions, outdoor parties and discos, as well as public announcement systems. What are the three characteristics of sound?