Atomic Physics – 1 – 5

21. Radio carbon dating is done by estimating in the specimen :

(a) The amount of ordinarily carbon still present
(b) The radio of the amounts of  6C14 6C12
(c) The amount of radio carbon still present
(d) None of these

ANSWER

EXPLANATION

22. The specific charge (e/m) of the electron is approximately :

(a) 20 × 102 C/kg
(b) 40 × 1012 C/kg
(c) 1.8 × 1011 C/kg
(d) 0.9 × 1011 C/kg

ANSWER

EXPLANATION

23. The constituent particles of a nucleus are :

(a) electrons, protons and neutrons
(b) α-particles and β-particles
(c) protons and neutrons
(d) electrons and protons

ANSWER

EXPLANATION

24. The value of 1 electron volt =  …………… J.

(a) 1.6 x 1019 J
(b) 1.6 x 10–19 J
(c) 1.6 x 1020 J
(d) 1.6 x 10–20 J

ANSWER

EXPLANATION

25. which of the following transition in hydrogen atoms emits Photon of highest frequency ?

(a) n=2 to n=6
(b) n=1 to n=2
(c) n=2 to n=1
(d) n=6 to n=2

ANSWER

EXPLANATION

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