Astronomy
1st Edition
ISBN: 9781938168284
Author: Andrew Fraknoi; David Morrison; Sidney C. Wolff
Publisher: OpenStax
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Textbook Question
Chapter 5, Problem 31E
Why is it dangerous to be exposed to X-rays but not (or at least much less) dangerous to be exposed to radio waves?
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Consider the following kinds of waves.
(i) gamma rays
(ii) microwaves
(iii) radio waves
(iv) visible light
(v) x-rays
(a) Rank the kinds of waves according to their wavelength ranges from those with the largest typical or average
wavelength to the smallest, noting any cases of equality. (Use only ">" or "=" symbols. Do not include any parentheses
around the letters or symbols.)
(b) Rank the kinds of waves according to their frequencies from highest to lowest. (Use only ">" or "=" symbols. Do not
include any parentheses around the letters or symbols.)
(c) Rank the kinds of waves according to their speeds in vacuum from fastest to slowest. (Use only '>' or '=' symbols. If
any elements are equal, show their equality in increasing order - for example: i > ii = iii.)
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mich type of electromagnetic radiation has a wavelength slightly larger than the light that is visible to humans?
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Infrared
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Does Wi-Fi, cellphone or microwave radiation cause serious damage to our body? Why or why not?
Chapter 5 Solutions
Astronomy
Ch. 5 - What distinguishes one type of electromagnetic...Ch. 5 - What is a wave? Use the terms wavelength and...Ch. 5 - Is your textbook the kind of idealized object...Ch. 5 - Where in an atom would you expect to find...Ch. 5 - Explain how emission lines and absorption lines...Ch. 5 - Explain how the Doppler effect works for sound...Ch. 5 - What kind of motion for a star does not produce a...Ch. 5 - Describe how Bohr’s model used the work of...Ch. 5 - Explain why light is referred to as...Ch. 5 - Explain the difference between radiation as it is...
Ch. 5 - What are the differences between light waves and...Ch. 5 - Which type of wave has a longer wavelength: AM...Ch. 5 - Explain why astronomers long ago believed that...Ch. 5 - Explain what the ionosphere is and how it...Ch. 5 - Which is more dangerous to living things, gamma...Ch. 5 - Explain why we have to observe stars and other...Ch. 5 - Explain why hotter objects tend to radiate more...Ch. 5 - Explain how we can deduce the temperature of a...Ch. 5 - Explain what dispersion is and how astronomers use...Ch. 5 - Explain why glass prisms disperse light.Ch. 5 - Explain what Joseph Fraunhofer discovered about...Ch. 5 - Explain how we use spectral absorption and...Ch. 5 - Explain the results of Rutherford’s gold foil...Ch. 5 - Is it possible for two different atoms of carbon...Ch. 5 - What are the three isotopes of hydrogen, and how...Ch. 5 - Explain how electrons use light energy to move...Ch. 5 - Explain why astronomers use the term “blueshifted”...Ch. 5 - If spectral line wavelengths are changing for...Ch. 5 - Make a list of some of the many practical...Ch. 5 - With what type of electromagnetic radiation would...Ch. 5 - Why is it dangerous to be exposed to X-rays but...Ch. 5 - Go outside on a clear night, wait 15 minutes for...Ch. 5 - Water faucets are often labeled with a red dot for...Ch. 5 - Suppose you are standing at the exact center of a...Ch. 5 - How could you measure Earth’s orbital speed by...Ch. 5 - Astronomers want to make maps of the sky showing...Ch. 5 - The greenhouse effect can be explained easily if...Ch. 5 - An idealized radiating object does not reflect or...Ch. 5 - Why are ionized gases typically only found in very...Ch. 5 - Explain why each element has a unique spectrum of...Ch. 5 - What is the wavelength of the carrier wave of a...Ch. 5 - What is the frequency of a red laser beam, with a...Ch. 5 - You go to a dance club to forget how hard your...Ch. 5 - What is the energy of the photon with the...Ch. 5 - If the emitted infrared radiation from Pluto, has...Ch. 5 - What is the temperature of a star whose maximum...
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- The average EarthSun distance is 1.00 astronomical unit (AU). At how many AUs from the Sun is the intensity of sunlight 1/25 the intensity at the Earth?arrow_forwardSuppose a creature from another planet had eyes that weresensitive to infrared radiation. Describe what it would see ifit looked around the room that you are now in. That is, whatwould be bright and what would be dim?arrow_forwardWhen penetrating radiation is directed at a material, the radiation intensity Increases linearly with increasing material thickness Decreases exponentially with decreasing material thickness Decreases linearly with increasing material thickness Decreases exponentially with increasing material thickness Increases exponentially with increasing material thicknessarrow_forward
- Calculate the energy in eV and wavelength in cm of a 100 kHz radiowave.arrow_forwardExplain the importance of discovering radio waves. You may cite at least two (2) applications in our daily lives.arrow_forwardSolar radiation reaches Earth at a rate of about 1,400 W/m2. If all this energy were absorbed, what would be the average force exerted by radiation pressure on a square meter oriented at right angles to the sunlight?arrow_forward
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