Description : When mechanical waves have a frequency below the audible range, these are called (a) Sonics (b) Infrasonics (c) Ultrasonics (d) Supersonics
Last Answer : Ans:(b)
Description : Sound of frequency below 20 Hz is called ______. (1) audio sounds (2) infrasonic (3) ultrasonic (4) supersonics
Last Answer : (2) infrasonic Explanation: The term "infrasonic" applied to sound refers to sound waves below the frequencies of audible sound and nominally includes anything under 20 Hz.
Description : The sounds having a frequency of 20 Hertz to 20,000 Hertz are known as – (1) Audible sounds (2) Ultrasonics (3) Infrasonics (4) Megasonics
Last Answer : (1) Audible sounds Explanation: An audio frequency is characterized as a periodic vibration whose frequency is audible to the average human. It is the property of sound that most determines ... 000 Hz, although the range of frequencies individuals hear is greatly influenced by environmental factors.
Description : The sounds having a frequency of 20 Hertz to 20,000 Hertz are known as (1) Audible sounds (2) Ultrasonics (3) Infrasonics (4) Megasonics
Last Answer : Audible sounds
Description : Ultrasonics and infrasonics are not detected by __________. a)humans b)animals c)birds d)all of them
Last Answer : a)humans
Description : Sound of frequency below 20 Hz is called ______.
Last Answer : Infrasonic
Description : The term "infrasonic" applied to sound refers to sound waves below - (1) 200 Hz (2) 20000 Hz (3) 20 Hz (4) 0 Hz
Last Answer : (3) 20 Hz Explanation: The term "infrasonic" applied to sound refers to sound waves below the frequencies of audible sound, and nominally includes anything under 20Hz.
Description : What are audible sound waves? (1) Having frequency less than 20 Hz (2) Having frequency between 20 Hz to 20000 Hz (3) Having frequency more than 20000 Hz (4) None of above
Last Answer : (2) Having frequency between 20 Hz to 20000 Hz
Description : Man perceives sound vibrations in the frequency ranges of – (1) 0 – 5 Hz (2) 6 - 10 Hz (3) 11 - 15 Hz (4) 20 - 20000 Hz
Last Answer : (4) 20 - 20000 Hz Explanation: The frequencies at which a human being can perceive sound vary between 20 Hertz and 20,000 Hertz. It is within these frequency ranges that people can communicate to each other and listen to music.
Description : Man perceives sound vibrations in the frequency ranges of (1) 0 – 5 Hz (2) 6 – 10 Hz (3) 11 – 15 Hz (4) 20 – 20000 Hz
Last Answer : 20 – 20000 Hz
Description : Sounds of frequency below 20Hz are called
Last Answer : infrasonic sound or subsonic sound.
Description : Froude number is significant in (A) Supersonics, as with projectile and jet propulsion (B) Full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc. (C) Simultaneous motion ... gravity forces, and wave making effect, as with ship's hulls (D) All of the above
Last Answer : Answer: Option C
Description : Reynolds number is significant in (A) Supersonics, as with projectile and jet propulsion (B) Full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc. (C) Simultaneous motion ... gravity forces, and wave making effect, as with ship's hulls (D) All of the above
Last Answer : Answer: Option B
Description : Mach number is significant in (A) Supersonics, as with projectiles and jet propulsion (B) Full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc. (C) Simultaneous motion through ... gravity force, and wave making effects, as with ship's hulls (D) All of the above
Last Answer : Answer: Option A
Description : What causes low-frequency flutter (below 1000 Hz)?
Last Answer : Rotating parts of a tape transport, such as irregular tape reels, sticking guides and pinch rollers, and capstans
Description : The frequency of a source of sound is 200 hz.How many Times does it vibrate in 2 min? -Physics
Last Answer : Hence, the source vibrates 12000 times in a minute, producing a frequency of 00 Hz.
Description : which of the following animals could detect sound at a frequency of 67,000 hz? -General Knowledge
Last Answer : Dogs could detect sound at a frequency of 67,000 Hz.
Description : The mean velocity of blood flow in the aorta during systole is 1.5 × 10–2 m / s. What is the frequency change in an instrument with a signal frequency of 105 Hz (speed of sound in blood, 1570 m / s)?
Last Answer : 1060 kg/m3, very close to pure water's density of 1000 kg/m3. The average adult has a blood volume of roughly 5 litres (11 US pt) or 1.3 gallons, which is composed of plasma ... .4 million (female) erythrocytes: Red blood cells contain the blood's hemoglobin and distribute oxygen. Mature red blood
Description : What is the frequency of a 2-cm sound wave in sea water at 25˚C? A. 76 kHz B. 76 Hz C. 76 MHz D. 76 mHz
Last Answer : A. 76 kHz
Description : The midrange frequency range of sound is from A. 256 to 2048 Hz B. 2048 to 4096 Hz C. 512 to 2048 Hz D. 16 to 64 Hz
Last Answer : A. 256 to 2048 Hz
Description : The bats can fly in the dark because (a) They have a better vision in the dark (b) The light startles them (c) They produce ultrasonics (d) None of the above
Last Answer : Ans:(c)
Description : What is ultrasonics?
Last Answer : The branch of science that deals with ultrasound is called ultrasonics.
Description : What is the frequency of sound waves in the audio complex? -General Knowledge
Last Answer : answer:
Description : What is the standard test tone used for audio measurements? A. 100 Hz B. 500 Hz C. 1000 Hz D. 2000 Hz
Last Answer : C. 1000 Hz
Description : A 1 Mhz carrier is amplitude modulated by a pure 200-Hz audio test tone. Which of the following combinations of frequencies represent the total content of the AM signal? A. 1 MHz and 200 Hz B. 1 MHz and 1000.2 kHz C. 999.8 kHz, 1000 kHz, and 1000.2 kHz D. 999.8 kHz and 1000.2 kHz
Last Answer : C. 999.8 kHz, 1000 kHz, and 1000.2 kHz
Description : Sounds of frequency beyond 20,000Hz (20 kHz) are called
Last Answer : Ultrasonic sounds.
Description : Two waves, each of amplitude 1.5 mm and frequency 10 Hz, are travelling in opposite direction with a speed of 20 mm/s. The distance in mm between adjacent nodes is : (1) 1.0 (2) 1.2 (3) 1.5 (4) 2.0
Last Answer : (1) 1.0 Explanation: Since the amplitudes, frequency and the speed of both the waves are in same, hence the wavelength of the composite wave will be the same as the single wave.
Description : At what loudness level do pitch (in mels) and frequency (in Hz) are numerically equal? A. 0 dB B. 20 dB C. 60 dB D. 40 dB
Last Answer : D. 40 dB
Description : The frequency tolerance of an AM radio broadcast station A. 200 Hz B. 2000 Hz C. 20 Hz D. 2 Hz
Last Answer : C. 20 Hz
Description : A carrier signal has ______. A. Constant peak amplitude B. The information C. Frequency range 20-20000 Hz D. A varying amplitude
Last Answer : A. Constant peak amplitude
Description : A mass of 1 kg is attached to two identical springs each with stiffness k = 20 kN/m as shown in the figure. Under frictionless condition, the natural frequency of the system in Hz is close to * 1 point (A) 32 (B) 23 (C) 16 (D) 11
Last Answer : (A) 32
Description : Determine natural frequency of a system, which has equivalent spring stiffness of 30000 N/m and mass of 20 kg? A 12.32 Hz B 4.10 Hz C 6.16 HzD None of the above
Last Answer : C 6.16 Hz
Description : Calculate natural frequency of damped vibration, if damping factor is 0.52 and natural frequency of the system is 30 rad/sec which consists of machine supported on springs and dashpots. A 21 rad/sec B 25.62 rad/sec C 20.22 Hz D 3.15 Hz
Last Answer : B 25.62 rad/sec
Description : A 1 kg mass is suspended by a spring having a stiffness of 0.4 N/mm. Determine the natural frequency. A 20 rad/sec B 30 rad/sec C 20 Hz D 30 Hz
Last Answer : B 30 rad/sec
Description : Determine natural frequency of a system, which has equivalent spring stiffness of 30000 N/m and mass of 20 kg? A. 12.32 Hz B. 4.10 Hz C. 6.16 Hz D. None of the above
Last Answer : C. 6.16 Hz
Description : Determine natural frequency of a system, which has equivalent spring stiffness of 30000 N/m and mass of 20 kg? A) 12.32 Hz B) 4.10 Hz C) 6.16 Hz D) None of the above
Last Answer : C) 6.16 Hz
Description : Determine natural frequency of a system, which has equivalent spring stiffness of 30000 N/m and mass of 20 kg? C ( A )12.32 Hz (B) 4.10 Hz ( C )6.16 Hz (D)None of the above
Last Answer : ( C )6.16 Hz
Description : Determine natural frequency of a system, which has equivalent spring stiffness of 30000 N/m mass of 20 kg? a. 12.32 Hz b. 4.10 Hz c. 6.16 Hz d. None of the above
Last Answer : c. 6.16 Hz
Description : A body of mass 20 kg is suspended from a spring which deflects 20mm under this load. Calculate the frequency of free vibrations in Hz. a) 3.5 b) 5 c) 6 d) 7
Last Answer : a) 3.5
Description : Find the displacement in mm of the free longitudinal vibrations if the Natural frequency is 20 Hz. a) 0.1 b) 0.2 c) 0.5 d) 0.6
Last Answer : d) 0.6
Description : The frequency of a wave travelling at a speed of 500 ms-1 is 25 Hz. Its time period will be ______. (i) 20 s (ii) 0.05 s (iii) 25 s (iv) 0.04 s
Last Answer : (iv) 0.04 s
Description : The frequency of the rotor current in a 3 phase 50 Hz, 4 pole induction motor at full load speed is about (A) 50 Hz. (B) 20 Hz. (C) 2 Hz. (D) Zero.
Last Answer : (C) 2 Hz.
Last Answer : 2mm
Description : The reactance offered by a capacitor to alternating current of frequency 50 Hz is 20 Q. If frequency is increased to 100 Hz, reactance becomes_____ohms.
Last Answer : The reactance offered by a capacitor to alternating current of frequency 50 Hz is 20 Q. If frequency is increased to 100 Hz, reactance becomes 10 ohms.
Description : What audio sounds better?
Last Answer : The external is a proper stage lapel mic so I feel that should be the better one? It’s not as sharp though, I don’t know which I like better :/
Description : Why is there a buzzing sounds coming from my PC audio out jack?
Last Answer : Sounds like a dirty or dammaged connector.
Description : The sounds of which frequency are human beings most sensitive? A. 400 hertz B. 20 hertz C. 20000 hertz D. 5000 hertz (Answer)
Last Answer : D. 5000 hertz (Answer)
Description : The sounds having a frequency of 20 Hertz to 20,000 Hertz are known as
Description : When bowel sounds are heard about every 15 seconds, the nurse would record that the bowel sounds are a) normal. Normal bowel sounds are heard every 5-20 seconds. b) hypoactive. Hypoactive bowel sounds ... absent. The nurse records that bowel sounds are absent when no sound is heard in 3-5 minutes.
Last Answer : a) normal. Normal bowel sounds are heard every 5-20 seconds.
Description : A travelling wave passes a point of observation where the time interval between successive crests is 0.2 s. Which of the following is then true? (a) The wavelength is 5 m (b) The wavelength is 0.2 m (c) The velocity of propagation is 5 m/s (d) The frequency of 5 Hz.
Last Answer : Ans:(d)