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s a device that USES ultrasonic waves to MEASURE the DISTANCE, direction and speed of underwater objects. Principle: It uses the phenomenon of echoes in determining the sea-depth and locating the PRESENCE of under-water objects.

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wave is a wave of COMPRESSION and RAREFACTION, by which sound is generated in an elastic medium such as air. It is said that sound travels through air in form of longitudinal WAVES. Longitudinal waves are waves in which the motion of the individual particles of the medium is  parallel to the direction of ENERGY transport. The particles of the medium do not move all the way; they move back and forth. It is the same way how a longitudinal wave PROPAGATES, hence sound waves are called longitudinal waves.

swer:When two LIQUID of same MASS but DIFFERENT densities are mixed, the liquid with less density will float above the liquid with more density.Hope this HELPS uh..MARK Brainliest ♡

________________________________________________________→Given that , ◾Initial velocity U = 5 m/s ◾Acceleration a = 10 m/s²◾Time = 10 seconds. => DISTANCE covered S = ? ⭐Using the second equation of Motion , => S = ut + ½ at²•°• Plug in the values - => S = 5 × 10 + ½ × 10 × (10)²=> S = 550 m°•° Distance covered at the end of 10TH second is 550 m ________________________________________________

ssume that be the focal length of first convex LENS and be the focal length of second convex lens. use FORMULA, here P is the combined POWER of the optical system and are the powers of the individual lenses and 'd' is the distance.here, = 4D = 6D and d = 20cm = 0.2m so, P = 4 + 6 - 0.2 × 4 × 6 hence, P = 10 - 4.8 = 5.2D focal length , = 1/4 = 25cm = 1/6 = 50/3cmnow, 1/f = 1/25 + 3/50 - 20 × 3 /(25 × 50)= 2/50 + 3/50 - 12/250 = (10 + 15 - 12)/250 = 13/250hence, f = 250/13 = 19.23cm

nna coverts electrical energy into ELECTROMAGNETIC waves at transmitting end and it will receive the TRANSMITTED signals by receiver end and again converts into electromagnetic waves into electrical signal. Very HIGH FREQUENCY VHF of frequency range 30MHz to 300MHZ with wavelength 1m to 10m is uesd. This TYPE of propagation is called as line of sight communication. If H is height of transmitting antenna, then signal can be received up to a maximum distance of d= √2RH if heights of transmitting and receiving antennas be hT and hR. Range= d= √2Rht + √2Rhrso its clear from above statement that height of  TV Transmitting is antenna greater is its coverage

s an IMPORTANT role in our everyday life. A few examples are:-1. In our digestive system - Hydrochloric acid is produced in the stomach to help in digesting food. However, when the amount of acid exceeds a certain limit it causes acidity and pain. This acidity can be NEUTRALIZED by taking a mild base called as an antacid.2. pH of soil – Plants grow only in soils that have a definite pH RANGE. So, HIGHLY acidic soils are treated with quicklime or calcium carbonate to reduce its acidity.3. Tarnished vessels – Copper vessels are tarnished due to the formation of a LAYER of basic copper oxide. This can be removed when it is rubbed with the citric acid from a lemon. Copper oxide forms copper citrate with citric acid and is washed away giving a shine to the vessels.

ey ╚»★«╝Length of The Wire ( l ) = 2mResistance of The Wire ( R ) = 23∩ RESISTIVITY of The Wire = 1.84 X 10^6 ∩mLet the Area of Cross SECTION of the Wire be A.R = P  l / AA = P  l / R1.84 X 10^6 X 2 / 23⇒ 184 X 10^8⇒ 8 X 10^8∴ Area of Cross Section of The Wire = 8 X 10^8m²

law is defined as “The ratio of the sine of the angle of incidence to the sine of the angle of refraction is a CONSTANT, for the light of a given colour and for the given PAIR of media”. Snell’s law formula is expressed as:sinisinr=constant=μWhere i is the angle of incidence and r is the angle of refraction. This constant value is CALLED the refractive index of the second medium with respect to the first.USED in optical apparatus such as eyeglasses, contact lenses, CAMERAS, rainbows. There is an instrument called a refractometer that uses Snell’s law to calculate the refractive index of liquids. It is used all the time in the candy-making industry.

measure the GRAVITATIONAL mass of a solid USING a spring balance? ... Take a metallic solid block. ... Now we need to FIND the volume of the solid as you KNOW, ... PRECAUTIONS:

pieces of metal are A and B.a/c to question, ratio of length of pieces A and B is 1 : 2 and ratio of radius of pieces A and B is 1 : 2. e.g., and we know, where R is resistance, l is length of WIRE and a is cross SECTIONAL area of wire. so,  and here, we get, when both pieces are CONNECTED in parallel.then, hence,

age is FORMED on the retina. The light sensitive cells of retina get activated and they generate electrical signals. These signals are send to brain by the optic nerves for the INTERPRETATION. We can sense the objectthrough our EYES, through TOUCH or by the description given to us, through our IMAGINATION.

.. THE LIGTH WHICH BENDS LEAST ON TREFRACTION IS RED BECAUSE OF ITS HIGHSPEED. HOPE IT HELPS

OF REFLECTION. ✳✳✳✔THE INCIDENT RAY, REFLECTED RAY AND NORMAL LIES SAME PLANE. ✔ANGLE OF INCIDENCE IS EQUAL ANGLE OF REFLECTION. HOPE IT HELPS

█ ▄▀▀ █░░░█ █▀▀ █▀▀▄ █▀█ █░▀█ ░▀▄ █░█░█ █▀▀ █▐█▀ ▀░▀ ▀░░▀ ▀▀░ ░▀░▀░ ▀▀▀ ▀░▀▀Some POLAR COMPOUNDS are HCL.. AND.. NH3.✨✨HOPE IT HELPS ✨✨

0=50×10^-3×10×hh=20m HOPE It HELPS ✌️✌️✌️

___________________________________________________________→What is Error ?=> The difference between the true VALUE and the measured value is called Error.°•° Error = True Value - Measured Value ◾Types of Errors ---------------------------◼Constant Error - Errors that occur at a constant rate and effect each observation by the same magnitude. ◼Random Error - Errors that occur at Random intervals in PARTICULAR observation. ◼Least count error - Error imposed by the least count of the measuring instrument is called least count error .◼Gross Errors - These errors arise due to the carelessness of the person . ◼Systematic Errors - These are the errors that arise due to known REASON and hence can be removed. Further they are classified as -•Imperfection in EXPERIMENTAL techniques.•Instrumental error that is due to the inbuilt defect of the instrument. •Personal error that arises due to the carelessness of the person i,e improper handling of apparatus or wrong READINGS ._________________________________________________________

______________________________________________________________→Correction - It should be INERTIAL Mass. ★Inertial mass is the mass RELATED to LINEAR motion and is defined by the Newton's second law of Motion . => F = m a => If a = 1 , Then inertial mass m(i) = f Thus, inertial mass of a Body is equal for me magnitude of external force APPLIED required to produce unit acceleration in the body !!_________________________________________________________

Force = F = 10 NDisplacement = S= 2 m SINCE, There is a Formula to find out Work Done.i.e.=> W = FS => W = (10 X 2) N-m => W = 20 N-m or 20 Joules Be Brainly

____________________________________________________________→The shapes of cars and planes are streamlined . Why ? => The shapes of cars and planes are streamlined . This is because when an object MOVES through air , it EXPERIENCES frictional force that resists the motion of the BODY. In such a case , streamlined shape reduces the frictional force and helps in movement . [ NOTE - Frictional force is a contact force that comes to play when a Body moves or tends to move over the surface of ANOTHER body. ] __________________________________________________________

nding WHEELS have large MASS so that the nuts and grain can EASILY be crussed .When the Question arises of moderate diameter .,if the daimeter will be more the grains will get enough space s to be scattered and will not be easy to crush. THEREFORE it is important to have large mass and moderate daimeter in grinding wheels .HOPE IT HELPSPLZ MARK ME AS A BRAINLIEST ANSWER.IF YOU LIKE IT.☺☺☺☺☺☺☺☺☺

n physics means CONSTANT are they NEVER depend upon altitude ,RADIUS and PHYSICAL FACTORS.

principle of a DC motor. Amotor is an electrical MACHINE which converts electrical energy into mechanical energy. The principle of working of a DC motor is that "whenever a current CARRYING conductor is placed in a MAGNETIC field, it experiences a mechanical FORCE

alled CHEMICAL cellmark me as BRAINLIST

tance from the central maxima where the BRIGHT fringes due to both wavelengths COINCIDE will be 420 nmExplanation :Given 1ST wavelength = 560nm = 560 x 10⁻⁹m2nd wavelength = 420 nm = 420 x 10⁻⁹mD = distance of the screen and slit = 1 mmd = distance between 2 slits = 4 mmlet n fringes of wavelength 560nm coincides with n+1 fringes of wavelength 420nmwe KNOW that,x = nλD/d=> x = nλ₁D/d = (n+1)λ₂D/d=> nλ₁ = (n+1)λ₂=> n x 560 = (n+1) x 420=> n x 4 = (n+1) x 3=> 4n = 3n + 3=> n = 3Hence distance central maxima,x = nλD/d= 3 x 520 x 10⁻⁹ x 1/4= 420 nm

ment of d Without changing the position of the slit, biprism and the eye-piece; a convex lens is mounted on the OPTICAL bench between the latter two. The distances D1 and d2 between the well-defined IMAGES of the two virtual slits S1 and S2 are measured with the micrometer screw for the two positions of the lens as shown in (Figure 4). Then the DISTANCE between S1 and S2 is given by d = √(d1d2) If the convex lens is not well chosen, the distance d2 between the images of the slit in the second case (giving diminished images) becomes very small and the measurement become too erratic.

n :-Why does sun appear oval or flattened at sunrise and sunset but appears circular at noon?_________________________Answer :-During sunrise or sunset :➡The sun is very close to the horizon of the EARTH from our view.➡From that angle , the Sun RAYS TAKE maximum time to REACH the Earth particularly because the distance is more.➡Hence the Sun rays suffer refraction through several particles present in the atmosphere.➡This is the REASON why the Sun appears oval shaped or flattened.________________________________At noon➡At noon, the sun is directly overhead.➡Hence the light rays have to travel the shortest distance to reach the Earth .➡Thus the Sun appears circular because there is no scope of refraction in this case.___________________________Hope it helps :-)_____________________________________________________________

w what to do. PLZ COMPLETE your question I m UNABLE to UNDERSTANDING

convex MIRROR..size of the object is EQUAL to size of the IMAGE..

ecules..HOPE i FEEL it HELPS U..

nce also INCREASES..as the RESISTANCE is DIRECTLY PROPORTIONAL to length of the wire..

use RESISTOR as the CAPACITY to resist the flow of current..