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Correct Answer: It absorbs all the coloursA black object may look black, but, technically, it may still be reflecting some light. For example, a black pigment results from a combination of several pigments that col...Read more
Correct Answer: 17The velocity of sound in dry air is approximately 343 m/s at a temperature of 25 °C. Therefore, the reflecting object must be more than 17.2m from the sound source for echo to be perceived by a person located at the source....Read more
Correct Answer: IronVitamin B-12 deficiency can cause these and other health problems before it leads to anemia. Scurvy. Vitamin C deficiency can lead to scurvy...Read more