Jhaque

The light from the dust tail... is reflected sunlight from the dust. The source material for a meteor shower is usually... the debris left behind by a comet. The name of a meteor shower comes from... the constellation closest to the radiant. The asteroid that led to the extinction of the dinosaurs was believed to have 6.8×10^15 kg of mass and a speed of 12 km/s. What is the impact energy associated with the collision with Earth? 4.9x10^23 J The dwarf planet Ceres has a ...

Which of the following studies is best suited to astronomical observations that fall into the category called time monitoring? -Studying how a star's brightness varies over a period of 3 years. -Measuring the rotation rate of a distant star. -Studying how different planets differ in their surface compositions. -Determining the age of the solar system. Which of the following is not a reason why telescopes tend to be built on mountaintops that are relatively far from cities and are in r...

The Sun has an angular diameter of about 0.5◦ and an average distance of about 150 million km. What is the Sun's approximate physical diameter? Compare your answer to the actual value of 1 390 000 km. Given that the Sun has an angular diameter of about 0.5◦ and an average distance of about 150 million kilometers, we can use the angular diameter equation from Mathematical Insight 2.1: θ = d × 360◦ 2πD ,where θ is the angular diameter, d is the physical diameter, and D is the phy...

Asteroid belt between mars and jupiter Meteors shooting stars tiny dust particles or grains less than a centimeter in size occur when asteroid crosses earths orbit Meteorite a piece of meteor that survives atmospheric entry Jupiter less dense but 300x the size of earth small ring system Great red spot giant storm larger than earth that has lasted for 300 years Jupiter's moons more 50 moons Io, europa, ganymede, callisto Terrestrial planets Mercury, Ve...

Local Group The group of about 40 galaxies to which the Milky Way Galaxy belongs. Galaxy Clusters A collection of a few dozen or more galaxies bound together by gravity; smaller collections of galaxies are simply called groups. Superclusters The largest known structures in the universe, consisting of many clusters of galaxies, groups of galaxies, and individual galaxies. Observable Universe The portion of the entire universe that can be seen from Earth, at least in principle. ...

Each of the following diagrams shows a spaceship somewhere along the way between Earth and the Moon (not to scale); the midpoint of the distance is marked to make it easier to see how the locations compare. Rank the five positions of the spaceship from left to right based on the strength of the gravitational force that Earth exerts on the spaceship, from strongest to weakest. (Assume the spaceship has the same mass throughout the trip; that is, it is not burning any fuel.) Gravity follows an in...

Two Laws of Thermal Radiation 1) (Stefan-Boltzmann law) Each square meter of a hotter object's surface emits more light at all wavelengths 2) (Wien's Law) Hotter objects emit photos with higher average energy. Magnification the ratio of an object's image size to its real size; can blur images if too high or too low Resolution of a telescope amount of detail a telescope allows us to see; the smallest angle over which we can tell that two dots (or two stars) are distinct ...

T/F The most abundant element in the Sun is hydrogen. True T/F Neutrinos have never been detected experimentally. False T/F The proton-proton chain releases energy because mass is created in the process. False T/F There are as many absorption lines in the solar spectrum as there are elements present in the Sun. False T/F The density and temperature in the solar corona are much higher than in the photosphere. False The Sun spins on its axis roughly once each a)...

The amount of light that a telescope gathers is proportional to the square of its objective diameter. The two kinds of electromagnetic radiation that can easily be observed through the Earth's atmosphere are visible (optical) and radio. Emission spectrum is best described by which of the following? Only a few, separate colors A star's surface temperature is most accurately determined from: its color We can determine the chemical composition of an object most accurate...

Two stars have the same temperature, but one has twice the diameter as the other. Which star is more luminous? What is not true about the motions of the Moon? Newton's law of gravity stats that the force of attraction between two objects F is related to how the distance between them, where d is their separation? According to Kepler's third law, the square of an object's period of revolution around the Sun is proportional to what power of its distance to the Sun? ...

What happens when the earth blocks the sun's light from the moon lunar eclipse What phase is the moon in during a total lunar eclipse? Red moon lunar eclipse, must be a full moon, this eclipse is visible to the entire night side of earth Compared to the direction the sun rotates, most of the planets and their moons rotate in the same direction Density math problem Object A has density p1, object has the same shape and dimensions, but is 3x as massive. Object b ...

In this diagram of an accretion disk, there are two particles of dust labeled "A" and "B". A is closer to the black hole, while B is further away. How do their orbital times (time to travel around the black hole) compare? A takes less time to orbit the black hole than B. How does material move inward through the accretion disc? Bits of material collide with each other, losing speed but creating heat that then radiates away. As they lose speed, they fall inward. Imagine ...

Photon a particle of light with wavelength and frequency and thus energy Electromagnetic spectrum the range of wavelengths or frequencies over which electromagnetic radiation extends. Gamma rays Electromagnetic waves with the shortest wavelengths and highest frequencies Radio waves Electromagnetic waves with the longest wavelengths and lowest frequencies Emission spectrum a spectrum of the electromagnetic radiation emitted by a source. a gas is heated up to show this ...

THE PACKAGE CONSISTS OF EXAMS COVERING ALL TOPICS IN AQA CHEMISTRY.

Why do ionic compounds conduct electricity when molten or dissolved? Because the ions are free to move and carry charge. What is covalent bonding? Sharing of electrons between two non-metal atoms. Do covalent compounds conduct electricity? Why? No, because they don't have free charged particles. What is metallic bonding? Positive metal ions surrounded by a sea of delocalized electrons. Why are metals good conductors of electricity? Because the delocalized electrons in...

What color flame test for calcium go? Yellowy red What color flame test for copper go? Blue/ Green. What happens when you react aluminum with sodium hydroxide? White precipitate forms. Which dissolves in excess. What happens when you react calcium with sodium hydroxide? White precipitate forms. What happens when you react magnesium with sodium hydroxide? White precipitate forms. What happens when you react copper (II) with sodium hydroxide? Blue precipita...

NPK fertilizers use and makeup These are formulations made to improve agricultural productivity. They are made of salts of: - Nitrogen - Phosphorus - Potassium How to get nitrogen for NPK fertilizers Ammonia, produced in the Haber process, can react to form other nitrogen-containing compounds, e.g. reacting ammonia with oxygen and then water produces nitric acid. Ammonium salts are common compounds found in fertilisers - formed by reacting ammonia with acids. Ammonium nitrate is a use...

Burning fossil fuels releases more CO2 Agriculture farm animals produce methane Creating waste - landfills waste contributes to CO2 build up Climate change consequences ice caps melt animals die weather changes temp changes Carbon footprints measure of the amount of greenhouse gases released by something over its lifetime. Air pollution pollutants: fossil fuels incomplete combustion - soot carbon monoxide release of sulfur dioxide and oxides of nitrogen ...

Electroplating coating (a metal object) by electrolytic deposition with chromium, silver, or another metal. Carat a measure of the purity of gold, pure gold being 24 carats. Steels alloys of iron with carbon and/or other elements Carbon steels the simplest steels, alloys of steel with carbon. Stainless steels chromium-nickel steels that combine hardness and strength with great resistance to corrosion. Thermosoftening polymer polymers that soften when heated and har...

What is the advantage of borosilicate glass over soda-lime glass? Borosilicate glass melts at a higher temperature Give two examples of clay ceramics Pottery and bricks How are clay ceramics made? By shaping wet clay and then heating in a furnace What do the properties of polymers depend upon What monomers the polymer is made from and the conditions under which they are made Name the two polymers made from ethene Low density poly(ethene) (LDPE) and high density poly(ethe...