NEET 2016 Phase 2 | Atoms and Nuclei Question 35 | Physics

The half-life of a radioactive substance is 30 minutes. The time (in minutes) taken between 40% decay and 85% decay of the same radioactive substance is

NEET 2016 Phase 2

MCQ (Single Correct Answer)

-1

If an electron in a hydrogen atom jumps from the 3^rd orbit to the 2^nd orbit, it emits a photon of wavelength $$\lambda $$. When it jumps from the 4^th orbit to the 3^rd orbit, the corresponding wavelength of the photon will be

$${{16} \over {25}}\lambda $$

$${9 \over {16}}\lambda $$

$${{20} \over 7}\lambda $$

$${{20} \over {13}}\lambda $$

NEET 2016 Phase 1

MCQ (Single Correct Answer)

-1

When an $$\alpha $$-particle of mass m moving with velocity v bombards on a heavy nucleus of charge Ze, its distance of closest approach from the nucleus depends on m as

$${1 \over {{m^2}}}$$

$${1 \over m}$$

$${1 \over {\sqrt m }}$$

NEET 2016 Phase 1

MCQ (Single Correct Answer)

-1

Given the value of Rydberg constant is 10⁷ m^$$-$$1, the wave number of the last line of the Balmer series in hydrogen spectrum will be

0.25 $$ \times $$ 10⁷ m^$$-$$1

2.5 $$ \times $$ 10⁷ m^$$-$$1

0.025 $$ \times $$ 10⁴ m^$$-$$1

0.5 $$ \times $$ 10⁷ m^$$-$$1

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Human Health and Diseases Body Fluids and Its Circulation Locomotion and Movement Neural Control and Coordination Reproduction in Organisms Reproductive Health Structural Organisation in Animals Digestion and Absorption Excretory Products and Their Elimination Chemical Coordination and Integration Human Reproduction Animal Kingdom Breathing and Exchange of Gases Evolution