h =   = 3 × 10⁸/10⁶ = 300 m

Uniform or constant acceleration is a type of motion in which the velocity of an object changes by an equal amount in every the time period.

more than the true weight: Thus if the lift falls freely under an acceleration g, the man’s apparent weightREDUCES to zero. If there were a small upward force, f , the lift and the man will fall down with an acceleration less than g. The man will feel an apparent weight f. Though not zero it is still less than his weight W.

Thus their resistances will add up, forming a voltage divider, resulting in the 25 W bulb getting 4 times more voltage than 100 W bulb.

The resistances will remain constant.

The current is given by I=V/R.

The voltage across the 25 W bulb has increased to about 352 V (1.5 times), increasing the current by 1.5 times.

The 100 W bulb will be dimmer and the 25 W bulb will glow twice as bright.

The 25 W bulb will fuse in a few seconds.

Or

Resistances of both the bulbs are

R1=V^2/P1 = 220^2/25

R2 = V^2/P2 = 220^2/100

Hence  R1gt ; R2

R1gt; R2

When connected in series, the voltages divide in them in the ratio of their resistances. The voltage of 440 V divides in such a way that voltage across 25 w bulb will be more than 220 V. Hence 25 w bulb will fuse.

Raindrops start to form in a roughly spherical structure due to the surface tension of water. … The cause is the weak hydrogen bonds that occur between water molecules. On smaller raindrops, the surface tension is stronger than in larger drops. The reason is the flow of air around the drop

speed: Speed is not a vector quantity. It has only magnitude and no direction and hence it is a scalar quantity.

The most suitable unit for expressing nuclear radius is Fermi. Named for the Italian Physicist Enrico Fermi who lived from 1901 to the year 1954, 1 fermi equals 10⁻¹⁵ meters. However, today the unit called Fermi is no longer in use. In its place, the unit used is called femtometer whose symbol is fm. 1 fermi = 1 femtometer.

The speed of light will be minimum while passing through glass because the optical density of glass is very high .in this situation transmission of light is very slow.

capillary action phenomenon: The absorption of ink by blotting paper involves capillary action phenomenon because the blotting paper is a thin and a smooth paper which allows a little thicker liquids like ink to absorb

One torr converted into millimeter of mercury equals = 1.00 mmHg

1 torr = 1.00 mmHg

Infra Red Waves

The period T is the time required to complete one cycle. The frequency is the number of cycles in one unit of time.

T=1/f

In your case, the sinewave has 60 cycles per second. This means that the sinewave repeats 60 times per second.

As a consequence f= 60 Hz. Therefore

T=1/60=0.01666666 sec

Here n=number of images

x=angle between the two mirrors

The no. of images formed when the angle is x :

n=(360/x)-1

For example,

x=60

Therefore, n=(360/60)-1

n=6–1

n=5

The diopter is the unit of measure for the refractive power of a lens. The power of a lens is defined as the reciprocal of its focal length in meters, or D = 1/f, where D is the power in diopters and f is the focal length in meters. Lens surface power can be found with the index of refraction and radius of curvature.

• A conventional laser printer whose printing velocity is medium or low usually utilizes a single diode laser beam. On the other hand, a printer in which the printing is effected at an extra-high speed is at present arranged such that the single gas laser beam is intactly employed, or this single gas laser beam is divided into plural gas laser beams by means of an acoustic optical deflector; and both the frequency band region of a modulator and the rate at which a rotating polygonal mirror rotates are reduced by scanning the plural gas laser beams simultaneously.
• In either case, however, so far as the gas laser is employed as mentioned above, it is impossible to steer clear of the large consumption of electricity and miniaturize the apparatus. Under such circumstances, there is recently focussed an introduction of a semiconductor laser which is capable of executing direct modulation for itself. However, this kind of semiconductor laser involves defects wherein the wavelength thereof is 1.5˜2-fold as long as that of the gas laser, which requires a large-sized configuration of the rotating polygonal mirror, and it has been quite difficult to constitute a laser printer by using a single laser beam on account of deteriorated photoconductivity which responds to a long wavelength of the foregoing semiconductor laser.

Edmund Halley

Heat is the total energy contained within a substance. As a solid is heated, its temperature increases as the molecules move faster. During the phase change, when solid melts into liquid, its temperature remains constant as the heat energy is stored as potential energy.

Kinetic energy is dependent on the object’s mass and velocity. Since kinetic energy is the energy of motion, all objects that have motion have potential kinetic energy. This energy is determined by the size of the object, where the object is and the speed or velocity it is moving at.

The speed of sound depends on the elasticity and density of the medium through which it is traveling. In general, sound travels faster in liquids than in gases and faster in solids than in liquids. The greater the elasticity and the lower the density, the faster sound travels in a medium.

Kinetic Energy (KE) of a body is given as,

KE = ½ mv² (where, m = mass of body and v = velocity of body)

So, if mass and velocity both will be doubled for a given body, then its KE will become ‘8 times’ of the original.

Optical power (also referred to as dioptric power, refractive power, focusing power, or convergence power) is the degree to which a lens, mirror, or other optical system converges or diverges light. It is equal to the reciprocal of the focal length of the device: P = 1/f.  The SI unit for optical power is the inverse meter (m⁻¹), which is commonly called the dioptre.

A transformer is a static electrical device that transfers electrical energy between two or more circuits. Its working depends upon Faraday’s Law of Electromagnetic Induction. Mutual induction between two or more winding is responsible for transformation action in an electrical transformer.

If the bulb had air inside of it the filament would quickly heat up and essentially burn up. However, a light bulb contains a vacuum or a specialized gas that doesn’t allow the filament to burn.

Silver is best conductor of heat while among metals lead is poorest conductor of heat. Cooper and aluminum are good conductor while mercury is a poor conductor.