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Adding of impurities to SEMICONDUCTOR is doping.

Materials which are used in semiconductor devices are generally of silicon , GERMANIUM etc .

The impurities belong  to either boron family members like gallium , indium to make p- type SEMICONDUCTORS and to make n-type semiconductors  we USE
nitrogen famiily members to make n-type semiconductors  like phosphorus ,
arsenic etc

Doping is done because ADDITION of small qty of them causes dramatic changes in the electrical properties.

Supersonic plane FLY with supersonic SPEED.
Supersonic speed is the speed which is greater than the speed of SOUND(APPROXIMATELY 340 m/s). It is measured in MACH numbers.

The LIGHT TRAVEL in FAST SPEED in VACCUME

1.
                 T = 2 π √ (L/g)
       For small changes in L,  we can write :
             ΔT/T = 1/2 ΔL / L
           T = 2 s        ΔL = α ΔTemp L

               ΔT = 1/2 * T * α * ΔTemp
                ΔT = 1/2 * 2 * 2 * 10⁻⁵ * (35-15) = 4 * 10⁻⁴ Sec

             change is 0.4 milliseconds
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2)
    NET Force =  WEIGHT of the cube - buoyancy force
                = 7.6 * 5³ * 9.81  N  -   0.8 * 5³ * 9.81 N
               = 1667.7  Newtons
     the direction of the net force is DOWNWARDS

The ABSORPTION of ink by blotting PAPER involves CAPILLARY action phenomenon.

Sounds can be MADE by twanging a string or an ELASTIC band, blowing down a pipe, banging something together, and scraping or shaking something. There are three families of musical INSTRUMENTS - string, wind and PERCUSSION. When a string is plucked on an instrument such as a guitar, the vibration is passed into the air and you hear a sound. Blowing into panpipes or a horn makes the air inside the pipes vibrate. Bongos and other percussion instruments produce vibrations when you bang them.

The lux is the SI UNIT of illuminance and LUMINOUS emittance.
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Take a white chart paper and PLACE mirror on it in a dark ROOM and MUST keep a thing which is STRAIGHT which represents the normal and it should not touch the mirror . then make fall a light from torch in a diagonal way you will be able to see that a reflected ray is formed.

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The HEATING of the transformer is due to the hysteresis loss and heating EFFECT of CURRENT

As no external FORCE is acted UPON the BODY so the FRICTIONAL force acting on the body is zero.

The POWER of the corrective lens should be  2 Dioptre.
P = 
                                               50 CM = 
P = 
P = +2D

Because in UPWARD MOTION WORK has to be DONE against GRAVITY.

Mass of BLOCK = 5 kg
coefficient of static friction,  = 0.4
coefficient of kinetic friction = 0.3

limiting friction = ×m×g=0.4×5×10 = 20N

Until a force greater than 20N is applied, the block won't MOVE. For any force F ≤ limiting friction, the value of friction will be F since friction is a self-adjusting force.

So when a force 10N is applied, the friction between block and table is 10N.

Because DUE INSUFFICIENT AMOUNT of ATMOSPHERIC GASES

Because METAL is a GOOD CONDUCTOR of HEAT

it TAKES an average of 8 minutes and 20 seconds to reach US ....

The coefficient of inertia in a ROTATIONAL MOTION is called the moment of inertia of a BODY about the GIVEN axis.
It helps to bring about a change in the state of rotation,torque has to be applied.

Francium is highly radio active. ALSO it is an alkali METAL. As we go down the GROUP, the reaction of alkali metal with water become more and more exothermic and violent. So if Francium reacts with water, francium HYDROXIDE and hydrogen gas would be produced with large amount of HEAT.

Let FIRST ball is THROWN at t = 0s.
second ball is thrown at t = 2s
u = 40 m/s
G = -10 m/s²

let they meet after t seconds at a HEIGHT H. Then both the balls will be at H.
for 1st ball, H = UT+(1/2)gt²
for 2nd ball, H = u(t-2) + (1/2)g(t-2)²

A bullet of mass m  has an initial velocity = v
initial kinetic energy of the bullet = 1/2  m v²

Wooden block :  mass  M , let the final velocity of the two bodies = V

       we apply the principle of conservation of MOMENTUM.
     m v + M * 0 = (M + m) V
               V =  m v / (M +m)

   The kinetic energy initial = 1/2 m v²
   the final kinetic energy = 1/2 (m+ M) V² = 1/2 * (m + M) [m v / (M+m) ]²
                     = 1/2 * m² v² / (M +m)

   loss of kinetic energy = 1/2 m v² [ 1 - m/(M+m) ] = 1/2 M m v² / (m+M)

M₁ = 6kg
u₁ = 10m/s
m₂ = 4 kg
u₂ = -5 m/s
v₂ = ?

Transverse wave :- The PARTICLES of the MEDIUM OSCILLATION perpendicular to the direction of propagation of the wave r called transverse wave.Longitudinal WAVES :- The particles of medium oscillation in the direction of the propagation of the wave r called longitudinal wave.

Because LIGHT rays PASS through the transparent OBJECT and SHADOWS only FORM when any object breaks this light rays