a) A laboratory thermometer A is kept 7 cm away on the side of the flame while a similar
thermometer B is kept 7 cm above the flame of a candle as shown in figure. Which of the
thermometers A or B will show a greater rise in temperature? Give reason for your answer.
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The thermometer which is placed above the flame will show a greater rise in temperature because hot air rises up and air on the top of the candle flame is getting heated by convection. Therefore, thermometer B will show a greater rise in temperature.
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