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प्रश्न
How is ultraviolet radiation useful to bankers?
अति संक्षिप्त उत्तर
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उत्तर
It helps detect alterations or forgery in cheques and other important documents, since erased or changed writing becomes visible under an ultraviolet lamp.
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अध्याय 5: Electromagnetic Waves and Spectrum - EXERCISE [पृष्ठ ११४]
