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Answer: (i) armed forces : Echoes can be used by the military to track down brand new weapon reputation out-of adversary

Answer: (i) armed forces : Echoes can be used by the military to track down brand new weapon reputation out-of adversary

In the event your speed off sound are 334 ms-step step 1, assess amount of time in that he hears a mirror

  1. military,
  2. geologists,
  3. fishermen.

Answer: t = 0

Radar a device can be used to track down an enemy heavens-craft motorboat. (ii) geologists : Echoes are utilized because of the geologists for nutrient lead generation. (iii) anglers : for finding fishes ultrasonic waves is sent towards the drinking water. When the these types of vibration strike a seafood, he or she is mirrored returning to the brand new receivers. Enough time to own hearing the brand new echoes submitted. The positioning away from seafood is computed by the d = v ? t/2 having fun with vel. away from voice within the water as the 1450 ms -step one .

Matter step one. The new program in accordance with the meditation regarding sound try: (a) megaphone (b) sounding board (c) sonometer (d) each other (a) and you can (b) Answer: (d) each other (a) and you may (b)

Question dos. Which is not the challenge toward creation regarding echoes ? (a) Minimum range amongst the source of voice and showing system is to be 17 meters. (b) The warmth from air might be more than 20°C. (c) The fresh new wavelength out-of voice might be below the brand new height away from the showing human body. (d) The fresh intensity of sound are adequate so it could become heard just after reflection. Answer: (a) Minimal distance within supply of voice and you will reflecting human body is getting 17 yards.

Question step three. Getting hearing a mirror, minimal distance within supply of voice and you will highlighting looks will likely be (a) twelve meters (b) 24 m (c) 17 m (d) 51 m Address: (c) 17m

Matter 4. Discover its target regarding the dark new owl or the bat produces: (a) infrasonic swells (b) ultrasonic surf (c) sonic surf (d) infrared swells Answer: (b) ultrasonic swells

Question 1. Men fireplaces a tool in front of a building 167 meters out. Answer: mousemingle Jak odstranit ГєДЌet d = 167 ? 2d = 167 ? dos meters Speed out-of sound = 334 ms -1 t to possess reflect to be heard = ?

Matter 2. A mirror was read immediately after 0.8 s, when a guy fireplaces a cracker, 132.8 yards from a high building. Estimate the speed regarding sound. 8 s d = 132.8 yards

Concern step three. The rate from sound is actually 310 ms -step 1 . A man fireplaces a tool. A mirror try heard immediately after step one.5 s. Estimate the distance regarding people in the cliff where echo was read. Answer: Price off sound = 310 ms -one time after which echo try heard t = 1.5 s length off cliff d = ? 2d = Speed ? t

Concern step 1. An echo are heard because of the an excellent radar when you look at the 0.08 s. When the acceleration off radio swells is step 3 ? ten 8 ms -step 1 , what lengths is the opponent airplanes ? 08 s v = step three ? 108 ms -step one

Matter dos. An adversary planes was at a distance away from 300 kilometres of good radar. In how far orange brand new radar should be able to locate the new airplanes ? Capture speed out-of radiowaves once the step 3 ? ten 8 ms -step 1 . Answer: d=three hundred t = ? v = step 3 ? ten 8 ms -1 t=2d/v = 2 ? 3 hundred ? 1000m/step 3 ?10 8 ms -1 =0.002 s = 2 ? 10 -step three s

Question 1. A man stands in between two parallel cliffs and explodes a cracker. He hears the first echo after 0.6 s and second echo after 2.4 s. Calculate the distance between the cliffs. [Speed of sound is 336 ms -1 ] Answer: Let the 2 buildings A and B situated at a distance d1 and d2 from a man’s point.