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Chemistry In Focus

7th Edition
Tro + 1 other
Publisher: Cengage Learning,
ISBN: 9781337399692

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Section
BuyFindarrow_forward

Chemistry In Focus

7th Edition
Tro + 1 other
Publisher: Cengage Learning,
ISBN: 9781337399692
Chapter 7, Problem 25E
Textbook Problem
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The nearest star, Alpha Centauri, is 4.3 light- years from Earth. A light-year is the distance that light travels in one year. How far away is Alpha Centauri in kilometers?

Interpretation Introduction

Interpretation:

The distance between Alpha Centauri and the Earth is to be determined in kilometers.

Concept Introduction:

A star is a heavenly body or astronomical object visible in the sky at night.

Speed is the distance travelled per unit of time.

The relation between speed, time and distance is as follows:

Distance=Speed×Time

Here, distance is in meter, speed is in meter/second and time is in second.

Explanation of Solution

Given information: The distance between Alpha Centauri and the Earth in light years is 4.3lightyears and one light year is equal to the distance travelled by light in one year.

Firstly, the relationship between kilometer and meter is as follows:

1km=1×103m3.0×108m=3.0×108m×1km1s×1×103m=3.0×105km/s

The relationship between year and hours is as follows:

1year=365day1day=24hr365day=365day×24hr1day=8,760hr

The relationship between hour and second is as follows:

1hr=60min1min=60s8,760hr=8,760hr

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Chemistry In Focus
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