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

NEET 2016 Phase 2

MCQ (Single Correct Answer)

-1

Out of Syllabus

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 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

AIPMT 2015

MCQ (Single Correct Answer)

-1

A nucleus of uranium decays at rest into nuclei of thorium and helium. Then

The helium nucleus has more momentum than the thorium nucleus.

The helium nucleus has less kinetic energy than the thorium nucleus.

The helium nucleus has more kinetic energy than the thorium nucleus.

The helium nucleus has less momentum than the thorium nucleus.

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