Answer: (i) military : Echoes are used by the army locate the firearm updates out-of opponent

Answer: (i) military : Echoes are used by the army locate the firearm updates out-of opponent
If for example the speed away from voice is 334 ms-step step one, estimate time in that he hears a mirror

  1. military,
  2. geologists,
  3. anglers.

Answer: t = 0

Radar a tool can be used to obtain an opponent heavens-craft boat. (ii) geologists : Echoes can be used from the geologists to possess nutrient lead generation. (iii) anglers : to find fishes ultrasonic waves is delivered with the water. In the event that these types of vibration struck a fish, he’s mirrored returning to the latest receivers. The time to possess reading the newest echoes filed. The career from fish is computed from the d = v ? t/2 using vel. out of sound within the water because the 1450 ms -step 1 .

Concern step 1. The newest request in line with the reflection out of voice is: (a) megaphone (b) sounding-board (c) sonometer (d) both (a) and you will (b) Answer: (d) both (a) and you will (b)

Question 2. Which is not the issue toward creation out of echoes ? (a) Minimum range within way to obtain voice and you can reflecting body will be become 17 meters. (b) The heat from heavens might be over 20°C. (c) The wavelength out of voice will likely be below this new top of brand new reflecting body. (d) This new intensity of voice would be sufficient therefore it you will definitely become read just after meditation. Answer: (a) Minimal point within source of sound and you can highlighting body is always to be 17 meters.

Concern step 3. To have reading an echo, the minimum length between your source of voice and showing human body would be (a) a dozen m (b) 24 yards (c) 17 meters (d) 51 yards Address: (c) 17m

Matter cuatro. To obtain their victim regarding the darkness the fresh owl or the bat emits: (a) infrasonic surf (b) ultrasonic swells (c) sonic surf (d) infrared swells Answer: (b) ultrasonic swells

Matter 1. Men fires a weapon in front of a creating 167 m out. Answer: d = 167 ? 2d = 167 ? dos m Rates off sound = 334 ms -step 1 t to have reflect becoming read = ?

Concern dos. A mirror is actually read immediately after 0.8 s, whenever a guy fires an excellent cracker, 132.8 yards out-of a top strengthening. Determine the pace regarding sound. 8 s d = 132.8 yards

Concern step three. The interest rate from sound was 310 ms -1 . Men fireplaces a weapon. An echo try read just after step 1.5 s. Determine the length off individual on cliff of which echo was heard. Answer: Rate off sound = 310 ms -1 time and mirror is heard t = step one.5 s distance off cliff d = ? 2d = Rate ? t

Concern step 1. A mirror try read from the a great radar in the 0.08 s. When the velocity out of broadcast swells is actually step 3 ? ten 8 ms -step 1 , how long ‘s the opponent planes ? 08 s v = 3 ? 108 ms -1

Question dos. An adversary airplane is at a distance from three hundred kilometer off a great radar. In the way far orange the brand new radar should be able to place the newest planes ? Need speed of radiowaves once the step three ? ten 8 ms -step one . Answer: d=three hundred t = ? v = step 3 ? 10 8 ms -1 t=2d/v = 2 ? three hundred ? 1000m/3 ?ten 8 ms -step 1 =0.002 s = dos ? ten -step 3 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.

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