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A combinedtransmitterandreceiver, called atransducer, sends a soundpulsestraight down into the water. The pulse moves down through the water and bounces off the ocean bottom. The transducer is able to pick up the reflected sound. Computers precisely measure the time it takes for the sound pulse to reach the bottom and return. In shallow water the soundwaveswill return very fast and in deeper water it will take more time to receive the echoes. The depth of the ocean is calculated by knowing how fast sound travels in the water (approximately 1,500 meters per second). This method of seafloor mapping is calledechosounding.

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SONARis an acronym for Sound Navigation And Ranging. It is an acoustic device used to measure the depth, direction, and speed of under-water objects such as submarines and ship wrecks with the help of ultrasounds.

(C) 2√2π and 2π mm/s

Option D

The particle will move in such a way that the direction of force will be towards the centre..

And This difference in the path can be due to the nature of charge ( +ve or -ve ) on the particle) or the direction of the magnitude field ( outward or inward).

here, it is due to the direction of magnitude.. field one being inside the plane and other being outside.. it changes the direction of force.. acting on the particle.. and that direction of force can be found out by the right hand rule.

8 m/s2 is correct answer

Abit(short for binary digit) is the smallest unit of data in acomputer. Abithas a single binary value, either 0 or 1. Althoughcomputersusually provide instructions that can test and manipulatebits, they generally are designed to store data and execute instructions inbitmultiples called bytes.

i.The bat emits ultrasonic waves with very high frequencies.

When you shout, you set out a cascade effect where particles start to vibrate and propagate the sound. When it reaches a wall the sound bonds back and travels back to your ears. This phenomenon is termed as echo.

Fleming's right-hand rule gives which direction the current flows. The right hand is held with the thumb, index finger and middle finger mutually perpendicular to each other, as shown in the diagram. The thumb is pointed in the direction of the motion of the conductor relative to the magnetic field.

When we shout inside an empty hall, we hear our own sound because of the echo. As the room is empty, so there is no object which can absorb our sound.

The two main parts of an optical fiber arecoreand cladding. Thecorehas a higher refractive index compared to cladding, so as to facilitate propagation of light throughcoreby means of Total Internal Reflection.

Ans :- The nature of magnetic field around a straight current carrying conductor is like concentric circles having their center at the axis of the conductor (as shown in the figure atright). Direction of the circular magnetic field lines can be given by Maxwell's right handgripruleorRight handed corkscrew rule.

The direction of these circular magnetic lines is dependent upon the direction of current. The density of the induced magnetic field is directly proportional to the magnitude of the current. Direction of the circular magnetic field lines can be given by Maxwell's right hand grip rule or Right handed cork screw rule

Thusthe main partsof a micrometerscrew gaugeare: Frame. Upper head and Lower head arethe two main partsofscrew gauge.. othermain partsare Frame; Anvil; Spindle; Sleeve/ Barrel;Screw; Thimble; Locking Device and Scales ..

Upper head and Lower head are the two main parts of screw gauge..

other main parts are Frame; Anvil; Spindle; Sleeve/ Barrel; Screw; Thimble; Locking Device and Scales..

1- Circular scale 2 - Main scale

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1) A source of electricity such as cell,battery,power supply,etc helps to maintain a potential difference across a conductor.

2)When 1 Joule of work is done to move a charge of amount 1 Coulomb from one place to another, then it is said that potential difference between two pointsis 1 Volt (V).

3)The energy given to each coulomb of charge is equal to the amount of work which is done in moving it.

∴Work done =Potential difference × charge

Where, Charge = 1 C and Potential difference = 6 V

∴ Work done = 6×1

= 6 Joule.

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Energy = Power x Time

So Here,

Power= 100 Watts or0.1 kilo Watts

Time= 5 Hours

SoEnergy (in kWh or Unit) =0.1 kW x 5 hour =0. 5 kWh or 0.5 Unit Like if you find it useful

power into time100 watta 5 hour so ebnegy

option B

a) the rate of change of velocity is called acceleration.b) proton is a positive charge particlec) the solar energy is also called renewable energy

tq

thank you

{b.dl = μI where I is the sum of current enclosed by the loop in positive direction , say upward(•)

since I5 is not in the loop , we will neglect it.so total positive I = I1+I2+I3-I4-I6 = 1+2+3-1-4 = 6-5 = 1A

therefore {b.dl = μI

Given solute = 20gm, solution = 100g

Mass % = Mass of solute/mass of solution * 100

= (20/100) * 100

= 1/5 * 100

= 20%

Compressions are the regions with higher pressure and rarefaction are the region with lower pressure.