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(A) atoms of each element are stable and...

(A) atoms of each element are stable and emit characteristic spectrum.
(R) the spectrum provides useful information about the atomic structure.

A

if both assertion and reason are true and reason is the correct explanation of assertion.

B

if both assertion and reason are true but reason is not the correct explanation of assertion.

C

if assertion is true but reason is false.

D

if both assertion and reason are false.

Text Solution

Verified by Experts

The correct Answer is:
B
Atoms of each element are stable and emit characteristic spectrum. The spectrum consists of a set of isolated parallel lines termed as line spectrum . It provides useful information about the atomic structure .
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Knowledge Check

  • Consider the following statements : A. Atoms of each element emit characteristics spectrum. B. According to Bohr's Postulate, an electron in a hydrogen atom, revolves in a certain stationary orbit. C. The density of nuclear matter depends on the size of the nucleus. D. A free neutron is stable but a free proton decay is possible. E. Radioactivity is an indication of the instability of nuclei. Choose the correct answer from the options given below :

    A
    A, B, C, D and E
    B
    A, B and E only
    C
    B and D only
    D
    A, C and E only

  • The characteristic X- ray spectrum is emitted due to transition of

    A
    Valence electrons of the atom
    B
    Inner electrons of the atom
    C
    Nucleus of the atom
    D
    Both, the inner electrons and the nucleus of the atom

  • The characteristic X-rays spectrum is emitted due to transition of

    A
    valence electrons of the atom
    B
    inner electron of the atom
    C
    nucleus of the atom
    D
    both, the inner electrons and the nucleus of the atom