Question 27 of 28beginner🔧 ApplyShort Answer2 marks

Think of some events or phenomena whose time is of the order of (i) 10510^5 seconds and (ii) 10610^6 seconds. Write them in scientific notation. [Hint: Convert seconds to days]

(i)

Events of the order of 10510^5 seconds

Answer

Examples: (a) A weekend trip (~1.7 days ≈\approx 1.5×1051.5 \times 10^5 seconds), (b) Apollo 11 transit to the Moon (~76 hours ≈\approx 2.74×1052.74 \times 10^5 seconds), (c) Germination of mustard/radish seeds (~3 days ≈\approx 2.59×1052.59 \times 10^5 seconds), (d) Setting of curd in winter (~30 hours ≈\approx 1.08×1051.08 \times 10^5 seconds)

(ii)

Events of the order of 10610^6 seconds

Answer

Examples: (a) Hen's egg incubation (21 days ≈\approx 1.81×1061.81 \times 10^6 seconds), (b) One complete lunar synodic month (29.53 days ≈\approx 2.55×1062.55 \times 10^6 seconds), (c) Maturation cycle of short-duration moong dal (60 days ≈\approx 5.18×1065.18 \times 10^6 seconds)

Explanation

(i) 10510^5 seconds ≈\approx 1.16 days, so events lasting 1-3 days fit this order. Examples: a weekend trip (~1.7 days = 146,880 s ≈\approx 1.5×1051.5 \times 10^5 s), Apollo 11 transit to the Moon (~76 hours = 272,990 s ≈\approx 2.73×1052.73 \times 10^5 s), germination of mustard/radish seeds (~3 days = 259,200 s ≈\approx 2.59×1052.59 \times 10^5 s), setting of curd in winter at ~15°C (~30 hours = 108,000 s ≈\approx 1.08×1051.08 \times 10^5 s).\n(ii) 10610^6 seconds ≈\approx 11.57 days, so events lasting about 2-11 weeks fit this order. Examples: hen's egg incubation (21 days = 1,814,400 s ≈\approx 1.81×1061.81 \times 10^6 s), one complete lunar synodic month from new moon to new moon (29.53 days = 2,551,443 s ≈\approx 2.55×1062.55 \times 10^6 s), maturation cycle of short-duration moong dal varieties bred for Indian crop rotations (60 days = 5,184,000 s ≈\approx 5.18×1065.18 \times 10^6 s).

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