Bats search out prey and fly in dark night by emitting and detecting reflections of ultrasonic waves. The high-pitched ultrasonic squeaks of the bat are reflected from the obstacles or prey and returned to bat’s ear.The nature of reflections tells the bat where the obstacle or prey is and what it is like.Porpoises also use …
How can Bat detected the navigation and location of food in the dark? Read More »
Solution:Given,Time between transmission anddetection, t = 3.42 s. Speed of ultrasound in sea water, v = 1531 m/sDistance travelled by the ultrasound = 2 × depth of the sea = 2dwhere d is the depth of the sea. 2d = speed of sound × time = 1531 m/s × 3.42 s = 5236 m d …
The acronym SONAR stands for Sound Navigation And Ranging. Sonar is a device that uses ultrasonic waves to measure the distance, direction and speed of underwater objects. Sonar consists of a transmitter and a detector and is installed in a boat or a ship, The transmitter produces and transmits ultrasonic waves. These waves travel through …
Ultrasounds are high frequency waves. Ultrasounds are able to travel along well defined paths even in the presence of obstacles. Ultrasounds are used extensively in industries and for medical purposes. Ultrasound is generally used to clean parts located in hard-to-reach places, for example, spiral tube, odd shaped parts, electronic components etc.Objects to be cleaned are …
The audible range of sound for human beings extends from about 20 Hz to 20000 Hz (one Hz = one cycle/s). Children under the age of five and some animals, such as dogs can hear up to 25 kHz (1 kHz = 1000 Hz). As people grow older their ears become less sensitive to higher …
USES OF MULTIPLE REFLECTION OF SOUND Megaphones or loudhailers, horns, musical instruments such as trumpets and shehanais, are all designed to send sound in a particular directionwithout spreading it in all directions, In these instruments, a tube followed by a conical opening reflects sound successively to guide most of the sound waves from the source …
Solution:Given,Speed of sound, v = 346 m s–1Time taken for hearing the echo,t = 2 sDistance travelled by the sound= v × t = 346 m s–1 × 2 s = 692 mIn 2 s sound has to travel twice thedistance between the cliff and the person. Hence, the distance betweenthe cliff and the person …
A sound created in a big hall will persist by repeated reflection from the walls until it is reduced to a value where it is no longeraudible. The repeated reflection that results in this persistence of sound is called reverberation. In an auditorium or big hall excessive reverberation is highly undesirable.To reduce reverberation, the roof …
If we shout or clap near a suitable reflecting object such as a tall building or a mountain,we will hear the same sound again a little later. This sound which we hear is called an echo. The sensation of sound persists in our brain for about 0.1 s. To hear a distinct echo the time …
Sound bounces off a solid or a liquid like a rubber ball bounces off a wall. Like light, sound gets reflected at the surface of a solid or liquidand follows the same laws of reflection as you have studied in earlier classes. The directions in which the sound is incident and is reflected make equal …
