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When beryllium is bombarded with α -particles, extremely penetrating radiations which cannot be deflected by electrical or magnetic field are given out. These are:
(1) A beam of protons
(2) α -rays
(3) A beam of neutrons
(4) X-rays
Ans: A beam of neutrons
A first order reaction takes 69.3 minutes for 50% completion. Set up an equation for determining the time needed for 80% completion of this reaction.
When an electron drops from a higher energy level to a low energy level, then: (1) Atomic number decreases (2) Energy is absorbed (3) Atomic number increases (4) Energ
if one ton contains 2000 pounds and the coal is 2% by mass sulfur, what is the mass sulfur in one ton of coal? how many grams of sulfur is this? how many moles of sulfur is this?
THERMOCHEMISTRY The enthalpy changes associated with reaction are dependent upon the temperature. They are also dependent upon the amounts, and the pressure and states of the r
Ask Dear Sir Greetings Please be informed that I am an expert in Beekeeping at my Univ. We are intending to open new Dept. under the name under Honey Bee Dept. Consequently, we ne
what is the mass of a proton and electron
Q. Briefly explain about Diffusion of Gases? Ans. The following are some important points on the diffusion of gases: Gas molecules have an average kinetic energy
The first use of quantum theory to explain the structure of atom was made by: (1) Heisenberg (2 )Bohr (3) Planck (4) Einstein Ans: Bohr
curd formation in soya milk
Whereas a pure molecular species has a definite stoichiometry, this is not often true for solids. Defects in crystals will include vacancies (atoms missing from their expected site
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