Earthquake (shock) waves are

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Q: 12 (CDS-II/2009)
Earthquake (shock) waves are

question_subject: 

Science

question_exam: 

CDS-II

stats: 

0,41,60,41,48,3,9

keywords: 

{'waves': [0, 0, 3, 0], 'infrasonic waves': [0, 0, 1, 2], 'ultrasonic waves': [0, 0, 0, 5], 'infrared waves': [0, 0, 0, 1], 'ultraviolet waves': [0, 0, 1, 2], 'earthquake': [2, 0, 2, 0], 'shock': [0, 0, 2, 0]}

Earthquake waves, also known as seismic waves, are not ultrasonic, ultraviolet, or infrared waves. The correct option is option 1: infrasonic waves.

Infrasonic waves are low-frequency sound waves that are below the range of human hearing, typically less than 20 hertz. Earthquake waves are generated by the release of energy during an earthquake. They travel through the Earth`s crust and can be detected and measured by seismographs. These waves can cause the ground to shake and can be felt by people during an earthquake.

Ultrasonic waves, on the other hand, are high-frequency sound waves that are above the range of human hearing. Ultraviolet waves are electromagnetic waves with a wavelength shorter than that of visible light, and infrared waves have a wavelength longer than that of visible light.

Therefore, the correct answer is option 1: infrasonic waves, as earthquake waves fall within the range of infrasonic frequencies.