The first artificial disintegration of an atomic nucleus was achieved by
Geiger
Wilson
Madam Curie
Rutherford
When any radioactive element emits β particle, some product is obtained. They both are
isotopes
isobars
isomers
isotoes
B.
isobars
Isobars are atoms of different elements having same atomic masses but different atomic numbers. Loss of β-particles results in an increase in atomic number by 1 whereas atomic mass remains same.
xAy - β → x + 1Zy
An isotope is a form of a chemical element whose atomic nucleus contains a specific number of neutrons, in addition to the number of protons that uniquely defines the element.
Isomers are molecules that have the same molecular formula but have different structures.
Isotones are elements having the same number of neutrons.
Electrical field is used to deflect
α and β particles
α and γ particles
α, β and γ particles
β and γ particles
The energy of an electron present in Bohr's second orbit of hydrogen atom is
-1312 J atom-1
-328 kJ mol-1
-328 J mol-1
-164 kJ mol-1
In the ground state, an element has 13 electrons in M shell. The element is
copper
chromium
nickel
iron
Which one of the following statements is not correct?
Rydberg's constant and wave number have same units
Lyman series of hydrogen spectrum occurs in the ultraviolet region
The angular momentum of the electron in the ground state hydrogen atom is equal to
The radius of first Bohr orbit of hydrogen atom is 2.116 × 10-8 cm.
The energy of an electromagnetic radiation is 19.875 × 10-13 ergs. What is its wave number in cm-1? (h = 6.625 × 10-27 erg sec; c = 3 × 1010 cm sec-1)
1000
106
100
10000