Light year
Light year is a Science & Technology concept from the MPSC syllabus, tested in 2 past MPSC questions (2017, 2022). Below are those real questions with their correct answers and explanations.
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Real questions that test this
लांबीचे नवीन एकक असे निवडले की ज्यानुसार निर्वात पोकळीत प्रकाशाची गती 1 एकक येते. जर सूर्यप्रकाश, सूर्यापासून पृथ्वीपर्यंतचे अंतर 8 मिनिट व 20 सेकंदात कापत असेल, तर लांबीच्या नवीन एककानुसार सूर्य व पृथ्वीमधील अंतर किती ? A new unit of length is chosen such that the speed of light in vacuum is unity. What is the distance between the Sun and the Earth in terms of the new unit, if light takes 8 minutes and 20 seconds to cover this distance ?
Time = 8 min 20 sec = 500 seconds. Since speed of light is 1 unit in the new system, distance = speed × time = 1 × 500 = 500 units.
खालीलपैकी कोणती पद्धती पृथ्वी आणि ग्रह यांच्यामधील अंतर मोजण्यासाठी वापरतात? Which of the following methods is used for measurement of distance between Earth and planets?
The parallax method is standardly used for measuring large astronomical distances between the Earth and distant planets or stars.