RRB Junior Engineer / DMS / CMA 2019 · Question 52 of 3719
Life Sciences - Human Body
• Sound waves are longitudinal mechanical waves and frequency can be defined as the number of wave cycles happening in one sec. • Ultrasonic waves or Ultrasound waves: The sound frequency above 20,000Hz (upper audible limit of human hearing) is known as ultrasonic waves. Humans cannot detect it too. • Examples: Bat produce Ultrasonic waves.
Source: RRB JE 2019 CBT-1 (24-May-2019 Shift-2) — ixambee compilation with answer key and solutions · reliable-secondary
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