To hear a distinct echo, time interval between original sound and reflected sound must beSelect an answerA0.2 secB1 secC0.1 secD2 sec

You can hear an echo when the sound wave reflects from the wall and reaches you.If you hear an echo, 2 seconds after you produce the sound, how far is the wall?Use a speed of sound of 340 m/s for this question.    Group of answer choices1360 meters away from you340 meters away from you170 meters away from you680 meters away from you

Echo of sound wave is due toSelect an answerArefractionBreflectionCdiffractionDNone of these

When a sound is reflected from a distant object, an echo is produced. Let the distance between the reflecting surface and the source of sound production remains the same. Do you hear an echo sound on a hotter day?

On a bright winter's day, a coach notices an echo as he walks between a high school's playing field and the rear wall of its auditorium. He decides to estimate how far he stands from the reflective wall. He abruptly claps and determines that the sound pulse returns to his as an echo 0.523 seconds later (averaging several trials for enhanced reliability). The air is a frigid −10°C.Six months later, the coach decides to repeat his experiment on a hot summer day, standing at the same exact spot. This time, the echo takes a slightly shorter 0.484 seconds to return to the coach.(a)What is the temperature (in °C) of the air on the summer day? °C(b)How far (in m) does the coach stand from the reflective wall?

An ultrasonic transducer is being used to search for cracks within a thick concrete wall.  With the transducer in a given position, a pulse of ultrasound is sent out, and a reflected pulse is detected 40 microseconds later.  How deep beneath the surface of the wall is the crack from which the pulse reflected?  The speed of sound in concrete is 2000 m/s.0.04 m0.16 m0.08 m40 cm2Ultrasound is being used to examine an unborn baby.  If the baby’s head lies 4.5 cm beneath the surface of the mother’s skin, how long will it take a pulse of ultrasound to travel from a transducer at the surface to the baby’s head and back again?  The speed of ultrasound inside the body is roughly 1500 m/s.6 × 10-5 seconds3 × 10-5 seconds67.5 seconds135 seconds3A depth sounder is a device which allows a ship to measure the water depth at any point.  It works by using sonar to determine the distance to the river or sea bed or ocean floor.  A particular type of ship should not be taken into water which is less than 15 metres deep.  For this ship, what is the minimum safe time delay between sending a pulse of ultrasound vertically downwards and receiving the reflected pulse?  The speed of sound in water is approximately 1500 m/s.100 seconds0.02 seconds0.01 seconds50 seconds4Which one of the following statements about seismic waves is incorrect?S-waves are transverse wavesP-waves are longitudinal wavesS-waves can travel through both solid rock and liquid rockP-waves travel more quickly through solid rock than through liquid rock5A bat is using echolocation to locate its prey – an unfortunate fly!  The bat sends out a pulse of ultrasound and receives the pulse which was reflected from the fly 40 ms later.  How far is the fly from the bat?  Take the speed of sound in air to be 340 m/s.8.5 m6.8 m17 m13.6 m