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Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074

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Section
BuyFindarrow_forward

Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

When the Sojourner spacecraft landed on Mars in 1997, the planet was approximately 7.8 × 107 km from Earth. How long did it take for the television picture signal to reach Earth from Mars?

Interpretation Introduction

Interpretation:

The time required for the television signal to reach Earth from Mars has to be calculated.

Concept Introduction:

  • Electromagnetic radiation: A kind of radiation in which electric and magnetic fields vary simultaneously. It takes many forms such as radio waves, visible light, x-rays, infrared…
  • Relation between time and speed is,

  Speed=DistanceTime

Explanation

Television signals are electromagnetic in nature. The time required for the television signal to reach Earth from Mars is calculated

Given,

When the spacecraft was landed on mars, the planet was approximately 7.8×107km from earth.

Speed of electromagnetic waves in vacuum is 299800km/sec

  Speed=DistanceTime

Therefore,

  Time=Distancespeed=7

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