E-PolyLearning

576. The first orbit of hydrogen has a radius of
a. 0.429A°C
b. 0.529A°C
c. 0.339A°C
d. 0.22A°C
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Answer: (b).0.529A°C

577. Fast-moving electrons have energy
a. 1.5MeV
b. 1.3MeV
c. 1.6MeV
d. 1.2MeV
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Answer: (d).1.2MeV

578. Neutron was discovered by
a. Bohr
b. Dalton
c. Einstein
d. Chadwick
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Answer: (d).Chadwick

579. Balmer series lies in the region of
a. Uv region
b. Visible region
c. IR region
d. Radiofrequency region
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Answer: (b).Visible region

580. Uncertainty principle can be best understood by
a. Planck's theory
b. Stark effect
c. Compton effect
d. Zeeman effect
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Answer: (c).Compton effect