The movement of free electrons constitutes a current which is purely random in nature and over a long time averages zero. . Alliteration is the occurrence of the same letter or sound at the beginning of adjacent or closely connected words. Which one of the following statements best describes the concept of sound intensity? The speed of the sound wave increases. This preview shows page 1 - 2 out of 2 pages. The frequency of the sound … 1. A. But when the frequency of operation is high and the signal being processed is the magnitude as the transit time, then problem can occur. Forced vibrations, such as those between a tuning fork and a large cabinet surface, result in a much lower sound than was produced by the original vibrating body. Extraterrestrial noises 3. Lecture 6- Noise Pollution Mini Quiz # 1-Which of the following statements below BEST describe the physical mechanism of hearing loss due to exposure to loud noise? The author dwells on the importance of butterflies to the ecosystem and what would happen if they died. d. It is a sound sustained continuously during both inspiration and expiration. Atmospheric noise or static is caused by lighting discharges in thunderstorms and other natural electrical disturbances occurring in the atmosphere. Noise may be put into following two categories. [CDATA[> Syllabus. What is the power available from a 68Kva transformer connected in … If an object vibrates at a relatively high frequency, then the pitch of the sound will be low. Which one of the following statements does not accurately describe vibrations? A receiver has an input signal power of l.2µW. The particle of dust will oscillate left and right with a frequency of 226 Hz. , 4) The values may vary over a continuous range. Noise is usually expressed as a power because the received signal is also expressed in terms of power. This is the source of resistance in a conductor. Important Solutions 1. The interface between the two creates a discontinuity that causes random movement of the current carriers. Previous question Next question Get more help from Chegg. California State University, Fullerton • PUBH 415, Lecture 17 - Radiation pt II - FINAL (1).pdf, California State University, Fullerton • HESC 415, California State University, Fullerton • PUBH 201. Flicker noise or modulation noise is the one appearing in transistors operating at low audio frequencies. Which one of the following statements best describes the concept of sound intensity? External noise may be classified into the following three types: Internal noise may be put into the following four categories. Shot noise is also produced by the random movement of electrons or holes across a PN junction. Isolation transformer. Transit time is (he duration of time that it takes for a current carrier such as a hole or current to move from the input to the output. a)An electromagnetic wave moves at the speed of sound. 34 Which of the following statements describes what happens when a sound wave moves from air into water? 17.6.4. The signal to noise ratio is. From the above discussion we can write down. //--> External noises, i.e. Which of the following statements are TRUE of the frequency of sound and the perception of pitch? The speed of the sound wave decreases. The noise power is 0.80µW. asked Sep 12, 2016 in Environmental & Atmospheric Sciences by Lorena. Atmospheric noise accordingly consists of spurious radio signals with components spread over a wide frequency range. Actually this question is a multiple choice question, but the options of answer is not given in question. B) It is the idea or concept that you or your customer wishes to convey. However, some noise is also produced in the receiver. Sound waves are mechanical waves. A. So that an ac view the full answer. Student X will receive sound waves with a frequency higher than 10 kHz. K = Boltzmann’s constant = 1.38 x10-23 joules I Kelvin. It is for this reason that the inputs of microwave receivers are often taken directly to diode mixers. C. Student Y will receive sound waves with a … Accordingly at a given receiving point, the receiving antenna picks up not only the signal but also the static from all the thunderstorms, local or remote. Student X will receive sound waves with a frequency lower than 10 kHz. [CDATA[// >