Visitor activity

london

Public contributions from visitors who posted under the name london.

Questions 196
Answers 0

Recent questions

Latest questions from london

Select ALL the correct answers. According to the Big Bang Theory, the universe began over 13 billion years ago with an enormous explosion. Which two of the following observations provide the strongest evidence for this t...
1 answer
According to the Big Bang Theory, the universe began _______ as an explosion from _______ encompassing all matter, energy, space, and time as we know it. A. over 20 billion years ago, a single point B. over 20 billion ye...
1 answer
Which of the following accurately describes the main reaction that generates the Sun's light? A. Iron reacts with oxygen to form iron oxide. B. Hydrogen nuclei fuse, forming helium and releasing energy. C. Light reacts w...
1 answer
The Big Bang theory predicted that the ordinary matter in the Universe would be made up of 75% hydrogen and 25% helium. Through observation and measurements, scientists have confirmed that this ratio is correct. How does...
1 answer
ntists have used the big bang theory to make numerous predictions about the universe. One of their predictions is that about 75% of the visible matter in the universe should be hydrogen and about 25% should be helium. Ho...
1 answer
Other galaxies observed by astronomers are almost all redshifted. This means that most galaxies are moving away from our galaxy. Since this is true in every direction, the galaxies are all moving away from each other. Im...
1 answer
Everything in the Universe originated from a single point. How was it possible for everything in the Universe to have occupied a single point? A. All mass in the Universe was once energy, and energy does not take up spac...
1 answer
Which of the following theories describes the formation of the Universe as a gigantic explosion from a single point that threw out all of the material in the Universe in all directions? A. geocentric theory B. big bang t...
1 answer
When an object radiates heat, the strength of this radiation far from the object decreases when distance from the source increases as shown in the graph below: That is, radiated heat is much stronger near its source. The...
1 answer
Which of the following theories explains why the Universe is expanding at a great speed? A. theory of evolution B. heliocentric theory C. geocentric theory D. big bang theory
1 answer
The Doppler effect explains that the observed spectrum of light that is given off by a moving light source is different than that observed when the light source is stationary. The observed spectrum of light has higher fr...
1 answer
Absorption spectroscopy is a technique used to determine the composition of a substance. Each substance tends to behave consistently in terms of which types of radiation it absorbs. When a material absorbs a unique set o...
1 answer
Which of the following best describes the big bang theory? A. When a large star grew old and ran out of fuel, it resulted in a massive explosion of all types of material in all directions at a great speed. B. The Univers...
1 answer
he big bang theory states that the Universe began by expanding from a small point nearly 14 billion years ago. Since that time, the Universe has continued to expand, and it is still expanding today. In 1964, two scientis...
1 answer
In past centuries, many people believed in a static Universe—one that had existed forever without changing much, and one that would continue forever more or less as it is today. Which of the following facts supports the...
1 answer
In 1964, two American physicists, Arno Allan Penzias and Robert Woodrow Wilson, discovered a form of microwave radiation permeating throughout the universe at a temperature of about 3 kelvins. This cosmic background radi...
1 answer
Because of the Doppler effect, wavelengths of light _______ as the source moves toward an observer and _______ as the source moves away. A. lengthen (blueshift); shorten (redshift) B. shorten (blueshift); lengthen (redsh...
1 answer
Scientists have observed that the light emitted from faraway galaxies is shifted toward the red on the electromagnetic spectrum compared to similar galaxies that are closer. This is called a redshift. How does this data...
1 answer
Other galaxies observed by astronomers are almost all redshifted. This means that most galaxies are moving away from our galaxy. Since this is true in every direction, the galaxies are all moving away from each other. Su...
1 answer
The following image is a deep-field photograph of many distant galaxies taken with an infrared telescope. Image courtesy of NASA/ESA/S Since infrared light is not visible, colors were artificially assigned to the photo u...
1 answer
Which of the following is true regarding the speed of earthquake waves? A. S waves travel faster than P waves and surface waves. B. Surface waves travel faster than P waves and S waves. C. P waves, S waves, and surface w...
1 answer
The diagram below is a cross-section through the Earth. The black and white rays represent the paths of P-waves and S-waves respectively as they travel through the Earth from an earthquake epicenter. Examine the diagram,...
1 answer
Energy from an earthquake travels A. as seismic waves that cause matter to vibrate. B. fastest through the gases of Earth's atmosphere. C. as light waves that warm the rock underground. D. at the same speed through solid...
1 answer
When an earthquake occurs, potential energy in the Earth's crust is released and waves of energy move across the Earth. What are these waves called? A. seismic waves B. crust waves C. rock waves D. solid waves
1 answer
A seismic wave is traveling through the Earth's mantle. The deeper into the mantle the wave goes, the greater the pressure is. As the pressure in the mantle increases, A. the wave's frequency increases. B. the wave's spe...
1 answer

Recent answers

Latest answers from london

No public answers found for this visitor name.