NEET 2016 Phase 1 | Atoms and Nuclei Question 36 | Physics

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.

AIPMT 2015

MCQ (Single Correct Answer)

-1

In the spectrum of hydrogen, the ratio of the longest wavelength in the Lyman series to the longest wavelength in the Balmer series is

$${{27} \over 5}$$

$${5 \over {27}}$$

$${4 \over 9}$$

$${9 \over 4}$$

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