# An important news announcement is transmitted by radio waves to people who are 100. km away, sitting next to their radios, and by sound waves to people sitting across the news room, 3.0 m from the newscaster. Who receives the news first? Explain. Take the speed of sound in air to be 343 m/ s.

### College Physics

11th Edition
Raymond A. Serway + 1 other
Publisher: Cengage Learning
ISBN: 9781305952300

Chapter
Section

### College Physics

11th Edition
Raymond A. Serway + 1 other
Publisher: Cengage Learning
ISBN: 9781305952300
Chapter 21, Problem 62P
Textbook Problem
6 views

## An important news announcement is transmitted by radio waves to people who are 100. km away, sitting next to their radios, and by sound waves to people sitting across the news room, 3.0 m from the newscaster. Who receives the news first? Explain. Take the speed of sound in air to be 343 m/ s.

To determine
The news received to the people quickly by radio waves or by sound waves.

### Explanation of Solution

Given Info: Distance covered by radio waves dR is 100km , velocity of light  c is 3×108m/s , Distance covered by sound waves dS is 3.0m and the velocity of sound waves vsound is 343m/s .

Formula to calculate the transit time tR for the radio waves is,

tR=dRc

• tR is the transit time by radio waves
• dR is the distance covered by radio waves
• c is the velocity of light

Substitute 100km for dR and 3×108m/s for   to find tR

tR=(100km)(1m103km)3×108m/s=100×103m3×108m/s=3

### Still sussing out bartleby?

Check out a sample textbook solution.

See a sample solution

#### The Solution to Your Study Problems

Bartleby provides explanations to thousands of textbook problems written by our experts, many with advanced degrees!

Get Started

Find more solutions based on key concepts
Which molecule does not form during glycolysis? a. NADH b. pyruvate c. FADH2 d. ATP

Biology: The Unity and Diversity of Life (MindTap Course List)

Cells a. are self-contained, living units. b. serve the bodys needs but have few needs of their own. c. remain ...

Nutrition: Concepts and Controversies - Standalone book (MindTap Course List)

In exergonic reactions, the energy is: a.used. b.stored. c.released. d.lost.

Chemistry for Today: General, Organic, and Biochemistry

Why didnt astronomers before Shapley realize how large our Galaxy is?

Foundations of Astronomy (MindTap Course List)

As in Example 27.2, consider a power supply with fixed emf and internal resistance r causing current in a load...

Physics for Scientists and Engineers, Technology Update (No access codes included)

What is the nature of truth in science? Can anything be proven absolutely true?

Oceanography: An Invitation To Marine Science, Loose-leaf Versin