The average speed of an object is obtained by dividing the total distance travelled by the total time taken. That is, average speed = Total distance travelled / Total time takenIf an object travels a distance s in time t thenits speed v is, v = s/tLet us understand this by an example. A car …
An object is said to be in motion if its position in relation to its surroundings changes over time. It is a shift in an object’s position over time. Linear motion is the only type of motion that exists. It uses only one dimension since, as its name implies, it is in a specific straight …
We are able to hear with the help of an extremely sensitive device called the ear. It allows us to convert pressure variations in air with audible frequencies into electric signals that travel to the brain via the auditory nerve. The auditory aspect of human ear is discussed below. The outer ear is called ‘pinna’. …
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 …
