1

AIPMT 2000

MCQ (Single Correct Answer)
Maximum frequency of emission is obtained for the transition
A
n = 2 to n = 1
B
n = 6 to n = 2
C
n = 1 to n = 2
D
n = 2 to n = 6.

Explanation

$$\nu $$ $$ \propto $$ $$\left[ {{1 \over {n_1^2}} - {1 \over {n_2^2}}} \right]$$

Maximum frequency of emission happens when n1 = 1 and n2 = 2
2

AIPMT 2000

MCQ (Single Correct Answer)
The life span of atomic hydrogen is
A
fraction of one second
B
one year
C
one hour
D
one day

Explanation

Atomic hydrogen is unstable and it has life period of a fraction of a second.
3

AIPMT 2000

MCQ (Single Correct Answer)
The relation between $$\lambda $$ and T1/2 as (T1/2 $$ \to $$ half life)
A
T1/2 = $${{\ln 2} \over \lambda }$$
B
T1/2 ln2 = $$\lambda $$
C
T1/2 = $${1 \over \lambda }$$
D
($$\lambda $$ + T1/2) = ln2

Explanation

The relation is :

T1/2 = $${{\ln 2} \over \lambda }$$
4

AIPMT 2000

MCQ (Single Correct Answer)
When an electron does transition from n = 4 to n = 2, then emitted line spectrum will be
A
first line of Lyman series
B
second line of Balmer series
C
first line of Balmer series
D
second line of Paschen series.

Explanation

Jump to second orbit leads to Balmer series. The jump from 4th orbit shall give rise to second line of Balmer series.

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