PHYSICS

Irrespective of shape of vessels or containers, a connected liquid maintains same level in all containers. This happens to maintain same pressure at a given depth. As the pressure depends on depth of a point from the liquid surface.

MIRAGE is formed by the phenomenon of total INTERNAL reflection of light. Mirage is formed in extremely high or low temperature conditions. For example: When a sand surface (desert) or road surface is heated, the air above this surface is also heated and rises up. As a consequence, the density of air in the lower level is less than that of upper level.   Now , the light from any object starting from the upper layers (denser medium) travels to lower layers ( rarer medium), total internal reflection takes place i.e, the light is reflected back towards the denser medium. When these light rays reflected back, it seems that the light rays are refected from some bright reflecting surfaces on the ground.  Hence the  image is seen below the object.

Literally,  smoke + fog= smog. Smoke is the collection of unburnt fuel particles suspended in the air. Fog is the suspended water particles in the air. The combination of these suspended particles gives the smog.

The sound produced in a flute is due to the vibration of air column in the flute. The frequency of sound produced depends on length. The frequency is inversely proportional to the length of the air column. By closing or opening the holes , the length of the air column is changed and hence the frequency can be changed.

Sunlight contains seven colours, viz violet, indigo ,blue, green, yellow, orange and red. The leaves appear green because they absorb all the colours and reflect green as green colour is least used in photosynthesis. This green colour reaches our eyes. Hence leaves appear green.

Unstable hydrogen isotope contains 1 proton 2 neutrons Now, alpha particles are the particles with 2 protons 2 neutrons What do you think? As there are insufficient particles in the hydrogen isotope, no alpha particles can be released.