• When the amplitude of vibration of a sound is large, the sound is very loud. Key Concepts: 1) Sound is produced when there is a vibration. the loudness or softness of a sound. the number of vibrations per second. Get detailed answer of Q.4 Fill in the blanks with suitable words. The lower the frequency of vibration, the higher is the pitch. Number of vibrations produced by a vibrating particle in one second: b. Amplitude: 3. Both pitch and volume can affect how "loud" a … The hearing range of human ear is _____ Humans can hear a sound whose frequency falls in the range of 20 Hz−20,000 Hz. 1answer. If you are at an office or shared network, you can ask the network administrator to run a scan across the network looking for misconfigured or infected devices. In physics, sound is a vibration that propagates as an acoustic wave, through a transmission medium such as a gas, liquid or solid.. It is given as: L = log(I), here ‘I’ is the intensity. Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Speech intensity (loudness) Whereas pitch is determined by the speed of the vibrations of the vocal folds, loudness is determined by the strength of their vibration. Loudness is affected by the pitch, and vice versa. The voice of a soprano is higher in. (e) The shrillness of a sound is determined by the frequency of vibration. A body will resonate if the original vibration matches the Natural frequency of the resonator. (e) Shrillness of a sound is determined by the frequency of vibration. 5. Question 1. The air velocity is not to exceed 8 m/s to minimize vibration and noise. (e) The shrillness of a sound is determined by the _____ of vibration. Loudness … Answer: amplitude Industrial Vibration Sensors: The practice of Vibration Analysis does require the measurement and analysis of rotating machines utilizing different vibration sensors (accelerometers, velocity transducers, or displacement probes). The loudness of sound is determined by the (a) amplitude of vibration (b) ratio of amplitude and frequency of vibration (c) frequency of vibration (d) product of amplitude and frequency of vibration 8. The intensity or amount of energy of a wave, reflected in the height of the wave; the amplitude of a sound wave determine a sound's loudness. pitch than the voice of a basso, the yowling of an alley cat is higher in pitch than the sound of a fog horn. This abuse to the folds leaves the door open in time for a myriad of voice disorders. True. Loudness. The characteristic tone quality of a sound is determined by the voice or instrument which produces it. Medium. For example, a height of a wave on a calm ocean will be less than 1 foot whereas good surfing waves might be 10 feet or more in amplitude. The meters commonly employed to determine sound intensity measure in decibels. A medium through which sound cannot travel: g. 330 m/sec: 8. Loudness of a sound is determined by the  ............. of vibration. Question 3: Humans produce voice from which organ? If the amplitude becomes twice than the loudness of sound increases by a factor of 4. This is the unit used to measure the volume of a sound. (a) Loudness of sound is determined by the amplitude of its vibrations. The DASH score ranges from 0 to 100 points, with 0 indicating normal upper limb function and 100 indicating extremely limited function. The pitch of a sound is determined by the frequency of vibration of the sound … The pitch of a sound is determined by its frequency. The molecules move back and forth more vigorously. Name the characteristics of vibration body which determine the loudness pitch of sound produced by it 2 See answers getsparkling getsparkling Answer: Well , this is a physical science question.. not a biology question. Loudness is determined by the amplitude of vibration. Sound propagation: e. Vacuum: 6. Tags: Question 28 . (c) The unit of frequency is Hertz. Sound Class 8 MCQs Questions with Answers. The intensity or loudness of a sound depends upon the extent to which the sounding body vibrates, i.e., the amplitude of vibration. 1 0. trin. Forte. Unwanted or unpleasant sound is termed as music. 7. We previously reported the results of a study of disability, assessed by the Disability of the Arm, Shoulder and Hand (DASH) [ 1 ] and the DASH Work Module [ 2 ] questionnaires in a group of workers with HAVS. State the SI unit in which the loudness of sound is measured. The answer is: . Pitch is determined by which area of the basilar membrane vibrates, whereas loudness is determined by how much the basilar membrane vibrates at that area. The lower the frequency of vibration, the higher is the pitch. You can refer to NCERT Solutions for Class 8 Science Chapter 13 Sound to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams. askedJul 26, 2018in Scienceby Sakil Alam(64.1kpoints) sound. The loudness of sound is determined by the (a) amplitude of vibration (b) ratio of amplitude and frequency of vibration (c) frequency of vibration (d) product of amplitude and frequency of vibration; 1 hertz is equal to (a) 1 vibration per minute (b) 10 vibrations per minute (c) 60 vibrations per minute (d) 600 vibrations per minute • In other words, it is possible to keep the vibration frequency the same but to increase the strength of the vibration by forcing through more ai… Figure 5 The dash panel STL in 100~2,000 Hz As seen in Figure 5, a distinct trough and its minimum value appear in 160~400 Hz respectively. • Equal loudness curves - determined by using a standard 1,000 Hz tone • Almost equal loudness at 80 dB • High and low frequencies sound softer at 40 dB than the rest of ... • Ossicles act to amplify the vibration for better transmission to the fluid. (a) Time taken by an object to complete one oscillation is called . Loudness of a sound is determined by the ............. of vibration. Unwanted or unpleasant sound is termed as music. Q. What are the sources of noise pollution? Loudness of sound is proportional to the square of the amplitude of the vibration producing the sound. (a) Time taken by an object to complete one oscillation is called _____. It will be louder when the amplitude is high. Occurs when the frequency of forced vibrations on an object matches the object's natural frequency, and a dramatic increase in amplitude results (constructive interference). It is important to understand that the pitch of the voice can remain constant whilst the loudness of that particular pitch can be varied. The vocal folds of a person who speaks too high (or too low) have to work much harder to maintain a desired loudness. All NCERT textbook questions have been solved by our expert teachers. Download free PDF of best NCERT Solutions , Class 8, Science, CBSE-Sound . The structures designed to support heavy machines are also subjected to vibrations.There have been many cases of systems not meeting performance targets because of resonance, fatigue and excessive vibration of a component. The loudness is based on the amplitude of the vibration. Pitch is directly proportional to the frequency of vibration. how high or low a sound is. Answer: The to and fro or back and forth motion of an object is called vibration. (d) True. The loudness of a sound, or volume of a sound wave, can be determined by the amplitude of the sound wave. the back and forth movement of matter. 14. The scientific study of sound. The loudness level is measured in phons, whereas the pitch is measured in mels. Answer: Given Frequency = 40 Hz. Very Short Answer Type Questions. Cloudflare Ray ID: 614d505b1b7c0c65 The loudness of sound can be measured by a meter which is generally set so that a sound (in a given frequency range – determined by the type of filtering the device uses) that is at the “hearing threshold” Vocabulary words: 1) Vibration 2) Pitch 3) Volume Find its time period and frequency. For pipeline sections more than 0.5 m, the vibration displacement span is restricted to 0.5 mm (refer to the standards of the National Compressor Engineering Association “Souzcompressmach”) [ 2 ]. (c) The unit of frequency is _____ (d) Unwanted sound is called _____ . In the case of a. complex wave, the pitch is determined by the fundamental frequency. Find its time period and frequency. Bigger/ amplified vibrations result in bigger/louder sounds. You can also get free sample papers, Notes, Important Questions. Speech intensity (loudness) Whereas pitch is determined by the speed of the vibrations of the vocal folds, loudness is determined by the strength of their vibration. 2. Choose the correct option. Pitch. (c) The unit of frequency is hertz (Hz). The combined efficiency of the fan-motor unit to be used can be taken to be 50 percent. What are the sources of noise pollution? Living Science Solutions for Class 8 Science Chapter 13 Sound are provided here with simple step-by-step explanations. Question 5. Find its time period and frequency. Answer: (a) … answer choices . Flute: c. Time period: 4. For human ears, the audible range is 20 Hz to 20,000 Hz. Answer: (a) T, (b) F, (c) F, (d) T, (e) F, (f) F, (g) T. Question 4: Fill in the blanks with suitable words. The voice box is also called as Loudness: Increase in air flow “blows” vocal folds wider apart, which stay apart longer during a vibratory cycle – thus increasing amplitude of the sound pressure wave; Pitch: Increase in frequency of vocal fold vibration raises pitch 1answer. Contact tutor. Pitch. Performance & security by Cloudflare, Please complete the security check to access. The. A pendulum oscillates 40 times in 4 seconds. vacuum. Only acoustic waves that have frequencies lying between about 20 Hz and 20 kHz, the audio frequency range, elicit an auditory percept in humans. • Technically, volume is referred to as the loudness, and loudness is measured in sones. The relative highness or lowness of a sound, determined by the frequency of a sound wave. (e) Shrillness of a sound is determined by the of vibration. The Human Ear Hearing, Sound Intensity and Loudness Levels ... An auditory sound vibration / stimulation of stereocilia in a hair cell causes the release of a neuro-transmitter (TRPA1 protein – see below) which in turn stimulates a neuron in the auditory nerve. (e) Shrillness of a sound is determined by the frequency of vibration. Warren Booth is the product manager of the Vibration Control Product Group at Newport, 1791 Deere Ave., Irvine, CA 92606; e-mail: warren.booth@newport.com ; www.newport.com . (c) The unit of frequency is . Loudness is determined by _____ of vibration Get the answers you need, now! Oscilloscope. This is controlled mainly by the force with which the air from the lungs is allowed to pass through the voice box (larynx). If you are on a personal connection, like at home, you can run an anti-virus scan on your device to make sure it is not infected with malware. The pitch of a sound is how high or low the sound is. The highness or lowness of a sound is call it. and. 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