Infrared rays
Infrared rays is a Science & Technology concept from the MPSC syllabus, tested in 3 past MPSC questions (2015, 2016, 2024). Below are those real questions with their correct answers and explanations, plus the concepts worth being comfortable with first.
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पुढील दोन विधानांपैकी कोणते योग्य आहे ? अ. अतिनील किरणे किरकोळ गाठींवर उपयुक्त ठरतात. ब. अवरक्त किरणे रासायनिक द्रव्यांचे पृथक्करण करतात. Which one of the following two statements is correct ? a. Ultraviolet rays help in diagnosis of small tumours. b. Infrared rays help in analysis of chemical compounds.
(a)अतिनील किरणे किरकोळ गाठींवर उपयुक्त ठरतात. / Ultraviolet rays help in diagnosis of small tumours.
(b)अवरक्त किरणे रासायनिक द्रव्यांचे पृथक्करण करतात. / Infrared rays help in analysis of chemical compounds.
Ultraviolet rays are not used for diagnosing small tumours (X-rays, gamma rays or MRI are used), and infrared rays are used for studying molecular structure and thermal imaging rather than general chemical compound separation.
खालीलतील तापमानावर (300 के) वस्तुद्वारे उत्सर्जित होणाऱ्या औषणीय प्रारणासाठी महत्वपूर्ण योगदान तरंगलांबी किती असते ? / At room temperature (300k), what is the significant contribution wavelength for the thermal radiation emitted by a body ?
According to Wien's displacement law, for a body at room temperature (300 K), the peak wavelength of emitted thermal radiation lies in the infrared region around 9550 nanometers.
अतिनील किरणे _________ मधून आरपार जाऊ शकत नाहीत.
(a)कांच
(b)क्वार्ट्झ
(c)फ्लूओराईट
(d)रॉक सॉल्ट (सैंधव)
Ordinary glass absorbs ultraviolet (UV) rays and does not allow them to pass through. Quartz, fluorite, and rock salt are transparent to UV rays.