Course Code
sed323


Question
A pair of equal and opposite charges is known as

Answer
dipole



Question
An atom whose nucleus contains the same number of protons but different number of neutrons is called

Answer
isotope



Question
The process in which a sequence of nuclides, each of which transforms by radioactive disintegration into the next, until a stable nuclide is reached is callaed

Answer
decay series



Question
The time taken for radioactive nuclei to decay by half its original (or initial) quantity is called its _________

Answer
half-life



Question
The term charge quantization refers to the fact that

Answer
any charge is an integral multiple of the electronic charge



Question
An electron can circle an atomic nucleus indefinitely without radiating energy if its orbit an integral number of electron wavelengths in circumference is a statement of -------

Answer
Bohr's theory of the hydrogen atom



Question
An electron in the ground state of the Bohr atom has a radius of 0.053 nm. What is the radius of the first excited state?

Answer
0.212 nm



Question
The deBroglie waves can be regarded as ---------------- waves

Answer
probability



Question
How many quantum states are there in n = 3?

Answer
12



Question
The orbital quantum number determines the --------------- of the atom

Answer
the angular


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