To hear an echo distinctly, the time interval between the original sound and the echo should be more than 1/10 seconds. This time delay allows the reflected sound waves to travel a sufficient distance before reaching the listener’s ears, ensuring ...
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The outer part of the bottom of cooking utensils is often left black because black surfaces are excellent absorbers of heat. This allows the utensil to absorb more heat from the stove efficiently, leading to quicker and more even cooking.
NCERT CBSE class 10 science sample question paper with answer 2023-2024