Convert from scientific to decimal notation:2.3 andtimes; 104a)2300b)230,000c)23,000d)0.0023Correct answer is option 'C'. Can you explain this answer?

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ACT Exam > ACT Questions > Convert from scientific to decimal notation:2...

Convert from scientific to decimal notation:

2.3 × 10⁴

a)
2300
b)
230,000
c)
23,000
d)
0.0023

Correct answer is option 'C'. Can you explain this answer?

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Convert from scientific to decimal notation:2.3 × 104a)2300b)230...

In this case the exponent is positive hence you have to move the decimal point 4 places to the right from where it is in the problem giving us 23,000

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Directions:Read the passages and choose the best answer to each question.PassageThe Earth’s magnetic ﬁeld is one of its most signiﬁcant natural phenomena. For centuries, the ﬁeld has been used to aid navigation and exploration, and has been vital to many major discoveries. The magnetic ﬁeld of the Earth extends several thousands of miles into space. It has the effect of shielding the Earth from solar wind, protecting the planet from dangerous high-energy particles and radiation. The exact source of the Earth’s magnetic ﬁeld is not certain. The following two Scientists attempt to explain the phenomenon.Scientist 1The Earth’s magnetic ﬁeld is similar to that of a bar magnet tilted 11 degrees from the spin axis of the Earth.The magnetic ﬁeld of a bar magnet, or any other type of permanent magnet, is created by the coordinated motions of electrons within iron atoms. It is widely accepted that the Earth’s core consists of metals. The inner core is 70% as wide as the moon and consists of a solid iron ball, which would exhibit properties of ferromagnetism (the natural magnetic tendency of iron). The core has its own rotation and is surrounded by a “sea” of molten rock. The magnetic ﬁeld grows and wanes, and the Earth’s poles drift and occasionally ﬂip as the rotation of the core changes. The poles of the magnetic ﬁeld have “ﬂipped” many times due to the ﬂuctuations in the rotation of the solid inner core. Other ﬂuctuations in the magnetic ﬁeld that can occur on a daily basis are largely the result of interference by solar wind.Scientist 2The Earth’s magnetic ﬁeld is attributed to a dynamo effect of circulating electric current in the molten outer core. Electric currents cause magnetic ﬁelds; therefore, the circulating electric currents in the Earth’s molten metallic core are the origin of the magnetic ﬁeld. When conducting ﬂuid ﬂows across an existing magnetic ﬁeld, electric currents are induced, creating another magnetic ﬁeld. When this magnetic ﬁeld reinforces the original magnetic ﬁeld, a dynamo is created which sustains itself.Sitting atop the hot, iron inner core, the Earth’s molten outer core churns and moves. The outer core also has cyclones or whirlpools powered by the Coriolis effects of Earth’s rotation. These complex and unpredictable motions generate the ﬂuctuating magnetic ﬁeld. The outer core is seething, swirling, and turbulent, which has been detected by the constant changes and reversals in polarity throughout the planet’s history. Further, iron has a special characteristic.When it is hotter than 1043 K, its Curie temperature, iron loses its magnetic properties. Therefore the Earth’s magnetic ﬁeld is caused not by magnetised iron deposits, but mostly by electric currents in the liquid outer core.Q.Scientists 1 and 2 would most likely disagree about which of the following statements?

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Convert from scientific to decimal notation:2.3 × 104a)2300b)230,000c)23,000d)0.0023Correct answer is option 'C'. Can you explain this answer?

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