15. Which one of the following frequencies of a wave in the air can be heard as
ID: 1457565 • Letter: 1
Question
15. Which one of the following frequencies of a wave in the air can be heard as an audible sound by the human ear? A. 1,000 Hz B. 100,000 Hz C. 0.10 Hz D. 10 Hz 16. During the process of steel production, the flaws in steel casting are detected by A. ultrasonic vibrations. B. longitudinal vibrations. C. infrasonic vibrations. D. resonant vibrations. 17. Which of the following phenomena is taking place when sound waves are reflected from a surface along parallel lines? A. Refracting B. Focusing C. Absorption D. Diffusion 18. The spreading of sound waves around openings in barriers is called A. refraction. B. an echo. C. reverberation. D. diffraction. 19. The wavelength of a wave is the distance between A. two consecutive crests. B. the rarefaction and the following compression. C. the crest and the following trough. D. the amplitude and the normal position.
Explanation / Answer
15. Which one of the following frequencies of a wave in the air can be heard as an audible sound by the human ear?
Audible range in 20 Hz to 20 KHz
So,
answer will be:
A. 1,000 Hz
16. During the process of steel production, the flaws in steel casting are detected by
A. ultrasonic vibrations.
17. Which of the following phenomena is taking place when sound waves are reflected from a surface along parallel lines?
A. Refracting
refraction is the process of turning or bending of any wave, such as a light or sound wave, when it passes from one medium into another of different optical density.
Diffusion is the process of scattering of incident light by reflection from a rough surface; The transmission of light through a translucent material
Absorption is the process taking in or incorporation of something, such as a gas, a liquid, light, or heat
Focusing means covergence of multiple things (light rays, for example) on or toward a central point
18. The spreading of sound waves around openings in barriers is called
C. reverberation.
19. The wavelength of a wave is the distance between
A. two consecutive crests.
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