Write the definitions of protons and neutrons. If an atom has 52 protons, 63 neutrons, and 54 electrons, what is the overall mass of this atom (in amu)? In beta decay, a neutron at rest decays into a proton and an electron ejected in opposite directions. If the electron's speed is ...
Protons are also heavy particles and they have a positive charge. Electrons are light particles and they are negatively charged. There are many important features that arise from considering the number of these particles in each atom. For example, the number of protons an atom has will determine...
Today, string theory has taken on a life of its own. In the words of the mathematical physicist Robbert Dijkgraaf, “things have gotten almost postmodern” (quoted in Cole2016). Although it has not emerged as the promised theory of quantum gravity, string theory remains a useful formal tool...
The Large Hadron Collider (LHC) is the world's largest particle collider: a marvel of modern particle physics that has enabled researchers to plumb the depths of reality. In 2012, the massive atom smasher, a 16.5-mile-long (27 kilometers) underground ring on the border of France and Switze...
Physics is divided about the aether question and has been hostile to even looking at it since Einstein said that an aether was not necessary to explain things, that everything was happening in “fields” and that all motion is relative to something else. He took the easy way out, avoiding...
Shelly takes a compass and attempts to draw a circle on some plastic, using a pen. Once Shelly has cut out a misshapen circle, her desk partner Katie uses it as a template for her own experiment, cutting out a circle of plastic and a circle of cotton. ...
This form of MRI measures how water molecules diffuse through body tissues. Certain disease processes — such as a stroke or tumor — can restrict this diffusion, so this method is often used to diagnose them, Filippi said. Diffusion MRI has only been around for about 15 to 20 years, he ...
However, a recent paper has reported that CyP-D knockout mice display greater anxiety with less tendency to explore and a facilitation of avoidance behaviour. They also exhibit an abnormal accumulation of white adipose tissue resulting in adult-onset obesity but whether or not the loss of MPTP ...
The more protons and neutrons contained in an atomic nucleus, the heavier that element is. So, for example, lead has 82 protons and between 120 and 132 neutrons in its nucleus, whereashydrogen, the lightest element, has just one proton and occasionally one or two neutrons. ...
Which of the following compounds has the most deshielded protons? A) CH_3Cl B) CH_3I C) CH_3Br D) CH_4 The noble gas which forms maximum number of compounds is [NCERT 1976; BHU 1980; CPMT 1982, 91; AMU 1985; ...