Answer: (i) army : Echoes are utilized of the military discover the fresh new gun condition of enemy

Answer: (i) army : Echoes are utilized of the military discover the fresh new gun condition of enemy

In case your speed of voice try 334 ms-step one, determine time in that he hears a mirror

  1. armed forces,
  2. geologists,
  3. anglers.

Answer: t = 0

Radar a device is used to find a challenger air-interest ship. (ii) geologists : Echoes are used by geologists to have mineral lead generation. (iii) fishermen : for finding fishes ultrasonic swells was sent into h2o. When the these types of oscillations strike a seafood, he is mirrored to the receivers. The time having reading brand new echoes submitted. The positioning out-of seafood is actually computed from the d = v ? t/2 using vel. away from voice in the water since 1450 ms -step one .

Matter step one. The program according to the reflection out-of voice was: (a) megaphone (b) sounding board (c) sonometer (d) both (a) and you may (b) Answer: (d) one another (a) and (b)

Question 2. That isn’t the condition on the development regarding echoes ? (a) Lowest distance within supply of voice and you can highlighting muscles would be to become 17 meters. (b) The heat regarding air will be significantly more than 20°C. (c) The fresh new wavelength regarding voice will be lower than the latest level from the highlighting looks. (d) This new intensity of voice are going to be sufficient so it you certainly will feel heard immediately following meditation. Answer: (a) Minimal length between your source of sound and you may highlighting human body should be 17 meters.

Matter 3. To have reading a mirror, the minimum length between your way to obtain sound and you can highlighting human anatomy are (a) a dozen meters (b) 24 meters (c) 17 yards (d) 51 yards Address: (c) 17m

Question cuatro. To locate the sufferer on the dark the newest owl and/or bat produces: (a) infrasonic swells (b) ultrasonic surf (c) sonic surf (d) infrared waves Respond to: (b) ultrasonic surf

Matter step one. A guy fireplaces a weapon in front of a creating 167 m aside. Answer: d = 167 ? 2d = 167 ? dos m Price of voice = 334 ms -step one t having reflect becoming read = ?

Concern 2. A mirror are heard once 0.8 s, when a man fires an excellent cracker, 132.8 meters from a high strengthening. Determine the speed away from sound. 8 s d = 132.8 meters

Matter 3. The interest rate out-of sound is actually 310 ms -step one . A man fireplaces a tool. An echo was heard just after step one.5 s. Calculate the exact distance out-of people about cliff at which mirror is actually heard. Answer: Rate regarding voice = 310 ms -1 time then mirror are heard t = step 1.5 s range off cliff d = ? 2d = Rate ? t

Concern 1. A mirror try read from the an excellent radar during the 0.08 s. In the event the speed off broadcast waves try 3 ? 10 8 ms -step one , what lengths ‘s the enemy airplane ? 08 s v = 3 ? 108 ms -1

Question dos. An opponent airplanes is at a distance out-of 3 hundred kilometer regarding an excellent radar. In the manner much tangerine the fresh new radar will be able to discover the latest airplanes ? Just take speed from radiowaves since the step 3 ? 10 8 ms -1 . Answer: d=three hundred t = ? v = step three ? ten 8 ms -1 t=2d/v = 2 ? 300 ? 1000m/3 ?ten 8 ms -step 1 =0.002 s = dos ? 10 -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.

Leave a Reply

Your email address will not be published.

Scroll to top