Question
Which device uses ultrasonic waves for getting images of
internal organs of human body?Solution
β’ Sound waves are longitudinal mechanical waves and frequency can be defined as the number of wave cycles happening in one sec. β’ 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. β’ Examples: Bat produce Ultrasonic waves.
√3598 × √(230 ) ÷ √102= ?
15% of 2400 + (β 484 β β 256) = ?
(13)2Β - 3127 Γ· 59 = ? x 4
6269 + 0.25 × 444 + 0.8 × 200 = ? × 15
...(53 + 480 Γ· 4)% of 20 = ?% of 70
Find the simplified value of the following expression:
62 + 122 Γ 5 - {272 + 162 - 422}
(15 Γ 225) Γ· (45 Γ 5) + 480 = ? + 25% of 1240
β [? x 11 + (β 1296)] = 16
11 Γ 25 + 12 Γ 15 + 14 Γ 20 + 15 = ?