Sonar and Radar

Q.

What is Sonar? Explain the working and application of Sonar. [5 MARKS]

Q.

What is Sonar - Explained?

Q. In a SONAR, ___ converts ultrasonic waves into electrical signals.

1. refractor
2. detector
3. transmitter
4. reflector

Q.

A submarine emits a sonar pulse, which returns from an underwater cliff in $1.02s$. If the speed of sound in salt water is $1531m{s}^{-1}$, how far away is the cliff?

Q.

A ship sends sonar and receives an echo after 2 seconds. If the speed of sound waves in water is 1500 m/s, then the depth of the sea is

1. 1500 m

2. 500 m

3. 750 m

4. 1000 m

Q.

Give any two uses of ultrasonic waves in the medical field.

Q.

A sonar device on a submarine sends out a signal and receives an echo $5s$ later. Calculate the speed of sound in water if the distance of the object from the submarine is $3625m$.

Q.

Which technique is used to determine the depth of sea and underwater sunken ships? Explain its working.

Q. Are ultrasonic waves capable of traveling very large distances in a specific direction?If yes, then what's the reason behind it?

Q.

How is ultrasound used for cleaning hard-to-reach places?

Q.

What is the name of the device which is used to find the depth of sea (or ocean) by using ultrasonic sound waves ?

Q.

Sound waves with frequency greater than 20 kHz are called:

1. supersound

2. ultrasound

3. infrasound

4. megasound

Q.

Name two sources of sound.

Q.

A ship sends out ultrasound that return from the seabed and is detected after $5s$. If the speed of ultrasound through seawater is $1600m{s}^{-1}$, what is the distance of the seabed from the ship?

1. $2.5km$

2. $3.5km$

3. $4km$

4. $5km$

Q.

Name a few applications of ultrasound in medicine.

Q. Question 19
Explain the working and application of a sonar.

Q.

Give the reason for using ultrasonic waves in sonar.

Q.

What precautions should be taken while performing the experiment to verify the law of reflection of sound?

Q.

Is ultrasound a mechanical wave or an electromagnetic wave?

Q.

Sonar makes use of:

(a) infrasonic sound

(b) ultrasound

(c) ordinary sound

(d) light.

Q. What is the principle of sonar?

Q.

(a) What is sonar ? Explain its use.

(b) A sonar station picks up a return signal after 3 seconds. How far away is the object ? (Speed of sound in water = 1440~m/s).

Q.

A radar signal is reflected by an aeroplane and is received $2\times {10}^{-5}s$ after it was sent. If the speed of these waves are $3\times {10}^{8}m{s}^{-1}$, how far is the aeroplane?

Q. What is rador and sonar

Q.

What are some drawbacks of MRI (Magnetic Resonance Imaging)?

Q.

Write the full name of 'SONAR'.

Q.

Astronauts use ________ to communicate with each other in space.

Q. What is $SONAR$? Explain its working.

Q.

Name the type of waves which are used by astronauts to communicate with one another on moon (or in outer space).

Q.

A ship sends out ultrasonic waves that return from the seabed and are detected after 2.42 seconds. If the speed of ultrasonic waves through seawater is 1531 m/s, then what is the distance of the seabed from the ship?