There obujects coloured black, gray and white can withstand hostile condition upto `2800^(@)C` These object are throw into a farance where each of them attanit a temperature of `2800^(@)C` Which object will glow brightess?

Three objects coloured black, gray and white can withstand hostile conditions upto 2800^(@)C . These objects are thrown into a furance where each of them attains a temperature of 2000^(@)C . Which object will glow brightest?

Three objects coloured black, gray and white can withstand hostile conditions upto 2800^(@)C . These objects are thrown into a furance where each of them attains a temperature of 2000^(@)C . Which object will glow brightest?

Three objects coloured black, grey and white can withstand hostile conditions upto 2800^(0)C . These objects are thrown into a furnace where each of them attains a temperature of 2000^(0)C . Which object will glow the brightest ?

Three bodies of black, gray and white colour are able to sustain upto 2800^(@)C temperature. If these are kept in a frame then temperature of each becomes 2000^(@)C , then which body will be unlighted maximum ?

Three objects sphere , a cube and a circular plate of equal mass are constructed from same material . All of the three objects are initially heated to a temperature of 150^@C and then left to cool at room temperature. Will they all cool down at the same ? If not, which of them will cool faster and why ?

Four copper plates of the same dimensions are painted with red, green, white and black colours. All of them are heated upto a temperature of 300^(@)C and then allowed to cool in the surrounding, which is at room temperature. Which plate would cool at the earliest?

A man standing on sea-shore sees an elongated image (shown by dashed line) of a floating object AB. In fact he finds the image to be oscillating due to air turbu- lence. Figure (ii) gives three plots (a, b and c) of height from the water surface vs air temperature. Which one best illustrates the air-temperature condition that can create this image? [Many people have seen sea monsters due to this phenomena!]