Post hmasa lamah sound chungchang kan sawi tawh a. We shall now take a look at some of the properties of the sound waves.
Frequency
Frequency of a sound wave is the number of vibrations done by the sound wave in one second. The frequency is represented by cycles per second (C/S) or by Hertz. If the number of vibrations of sound wave is 100 vibrations per seconds then it is said to be a sound wave with 100 C/S or 100 Hertz(Hz) frequency. Frequency of 1000 C/S is commonly called 1KC/S or 1 kilo hertz.
Lower frequency sound will have more bass and as the frequency increases the sound become shriller. A female voice contain more high frequency sound than a male voice, male voice has more low frequency sound.
Human ear can detect frequencies from 20Hz to 20,000Hz, this range of frequency is known as "Audible Frequency". The higher and lower end of audible sound is heard only by people having sensitive ear such as children; older people find it difficult to hear the lower and higher end of frequencies.
Sound wave with frequency higher than highest audible frequency (20,000Hz) is called "Ultrasonic Wave" and waves with lower than the lowest audible frequency (20Hz) is called "Infrasonic Wave".
Intensity
Intensity is the loudness of the sound. A louder sound will have more intensity compared to a weak sound.
The sound intensity ratio is represented by "Decibel". This unit decibel(dB) is the 10th part of another unit "Bell", which is based on the name of the father of telephone - Graham Bell.
The decibel is logarithmic system of showing power ratio and is used extensively. Power of ratio of 10:1 is equal to 10 decibels (dBs) and that of 100:1 is 20 decibels (dBs).
Echo
Echo is another property of the sound waves. As the light wave get reflected from a mirror, the sound wave also gets reflected when it hits some obstacle. After hitting the obstacle the sound wave returns and the angle with which sound wave strike the obstacle.
Depending on the distance of the obstacle, this property of sound makes us hear the same sound twice or more than twice. This sound which has come back after hitting some obstacle is called an echo.
To get a clear echo the area of reflective block should be very large, and the interval between the direct sound and the reflected sound should be 1/15th of a second or more. Also the length of sound should be small.
Interesting and very informative post.
ReplyDeleteClass-XII a kan zir thin kha ka la hre reng. Silence hi 25dB vel a ni a, kan inbiak phung pangngai rin zawng chu 30-60dB a ni. Heavy traffic hi 90dB a ni a, motor horn hi 110dB a nih laiin jet thlawk chhuak tur hi 120dB vel a ni thung. 85dB vela ring a nih tawh chuan, beng tan a hlauhawm tawh a, beng a ngawng thei hial tawh a ni.
Ri ring lutuk a awm rei hian, kan ri hriatna a tichhe thei a. 95dB velah chuan, strees, anxiety leh nervous tension hial a thlen thei a ni.
A tha hle mai. Echo hi keini'n au khawk ruih ruih nana kan hman thin lai khan hnam fing zawkte chuan tuifinriat tui thuk zawng teh nan an lo hmang daih tawh kha a nia......
ReplyDelete@lr & Sir Cari, ani ngawt tak mai, in comment a bengvar thlak thin e. Sound hi a pawimawh khawp a, hei kan veng ah te pawh light and sound lamah ka tel ve thin a, hetianga a bul thut atanga han sawi a han tih hi an ngaithla tha peih hauhlo mai a. Enge dB tih pawh hre chiang manglo hian in ti hre tawk hian min hnial leh vak vak thin a, a chang hi chuan ka nuih a za tawp thin.
ReplyDelete100:1 ratio chu 10dB ani zawk lo maw?
ReplyDeleteDecibel hi unit of loudness a hman chu ani na in, beng ina a lo respond dan ringawt ania,relative term a ni mah mah. Ri zawi deuha hriat pawh,beng hnaih set sawtah chuan a ring lutuk ang hian. Intensity rational unit jok kha chu, watt per sq metre in which the receiver is perpendicular to the direction of propagation of sound.
Mizo trawngin han dah teh a,kan kohhran light n sound comt ho chhiar atan.
Quality/timbre te pawh han ti zel la, simple harmonic motion atang ten.
Good one! Keep em comin
@Morgoth, ka blog a i lo len ve avangin ka lawm e, welcome. 10:1 is equal to 10dB, 100:1 is equal to 20dB tiin ka lo hre mai asin. HETAH leh HETAH hian han en ve chhin teh. Ka hresual maithei bawk. Kan zirna a rei tawh deuh a....:D
ReplyDeleteI dik zawk e. Sorry ka lo chhiar chiang lo ani post khi.
ReplyDeleteLog(pwr ratio)= bel kha emni equation?
A maths hi ka chiang vak lo.
Zawhna: biakin a mi awmloh lai soundcheck hian engkim a fiah ring thra a,mipui an rawn khah vek hian sound ah problem a awm thei tih hi tak2 a ni em?
Kan sub comt ho chhuanlam lian tak ani a.
@Morgoth, i ti lawmawm lutuk e. I rawn sawi tak ah khan ka han ngaihtuah chiang a, i sawi kha a dik in ka hre tlat a. Mahse ka lehkhabu vel kan en a, ka zir kual leh hrep hnu ah khi khi ka hmuchhuak ta a, hehe. Ka theihnghhilh tawh ho ka hriat chhuah leh phah e.
ReplyDeleteThe dB value is calculated by taking the log of the ratio of the measured or calculated power (P2) with respect to a reference power (P1). This result is then multiplied by 10 to obtain the value in dB.
HEI HI lo chhiar ve chhin teh.
Biak in/ Hall ah hian mi awmloh lai hian sound hi a fiah tha duh khawp mai. A chhan chu sound chungchang post hmasa lama kan sawi ang khan, thil a va sut tur a ngah loh avangin a fawn pawh a nasa thei a. Hall ruak ah chuan han au vak le, a khawk ruah ruah thei ang. Mahse bungrua emaw, mihring emaw han dah khat la, han au vak la, a khawk a awm tawh miah lovang. Chuvang chuan in sub-comt. ho chhuanlam pawh khi a dik a pawm sak chi ani e. Mahse sound chinchang hre tak tan leh ngaihtuahna seng peih tan chua hetiang adjust hi thil har ani miah lo. Sir Caribou sawi ang deuh khian mi pawhin tuifinriat thuk zawng teh nan an hmang thei ania..:D
Mihring all-round tak i ni e. Good post.
ReplyDeleteNgaihnawm muah muah hle mai
ReplyDelete