Map_of_science_

Hot water freezes faster than cold, known as the Mpemba effect. ... Evaporation is the strongest candidate to explain the Mpemba effect. As hot water placed in an open container begins to cool, the overall mass decreases as some of the waterevaporates. With less water to freeze, the process can take less time. The freezing point is governed by impurities in the water that seed ice crystal formation. ... It was dubbed the  Mpemba effect  in the 1960s when schoolboy Erasto  Mpemba  from Tanzania claimed in his science class that ice cream would freeze faster if it was heated first before being put in the freezer 👉 follow @map_of_science_

What is the speed of Dark??? What do you think ???🙄🙄 Darkness travels at the speed of light. More accurately, darkness does not exist by itself as a unique physical entity, but is simply the absence of light. Any time you block out most of the light – for instance, by cupping your hands together – you get darkness. In the context of talking about speeds, darkness is what you get after the light stops coming, and therefore travels at the speed of light. For instance, consider that you are in distant space, far from all light sources such as the sun, and you have a light bulb on the nose of your space ship. The light from the light bulb is spreading out in all directions through space at the speed of light. If you briefly turn off your light bulb and then turn it back on, there is light traveling out in all directions from before you dimmed the bulb, and behind it there is light traveling in all directions from after you dimmed the bulb. But between the two spheres of ligh

  Q-   The correct relation between the radius of curvature R and focal length f of a spherical mirror is - 1) R = f 2) R = 2f 3) R = 3f 4) R = 4f Q. A lemon kept in water in a glass tumbler appears to be larger than its actual size. It is because of - 1) reflection of light 2) scattering of light 3) refraction of light 4) polarization of light Q. Name the scientist who first used a glass prism to obtain the spectrum of sunlight - 1) C. V. Raman 2) Lord Rayleigh 3) Isaac Newton 4) S. Chandrashekhar Q. This cost of energy to operate an industrial refrigerator that consumes 5 kW power working 10 hours per day for 30 days will be - (Given that the charge per kW.h of energy = Rs. 4) 1) Rs. 600 2) Rs. 6,000 3) Rs. 1,200 4) Rs. 1,500 Q. Which one of the following statements regarding magnetic field is not correct? 1) Magnetic field is a quantity that has direction and magnitude 2) Magnetic field lines are closed curves 3) Magnetic field lines are open curves 4) No two magnetic field lines ar