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A radioactive nucleus (initial mass number $A$ and atomic number $Z$ ) emits $3 α$ -particles and $2$ positrons. The ratio of the number of neutrons to that of protons in the final nucleus will be

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Important Questions on Modern Physics

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Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 9 - Modern Physics>Objective Problems [Level 2]>Q 71

The binding energy per nucleon for the parent nucleus is

E_{1}

and that for the daughter nuclei is

E_{2}

. Then,

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Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 9 - Modern Physics>Objective Problems [Level 2]>Q 72

A nucleus of mass

M + Δ m

is at rest and, decays into two daughter nuclei of equal mass

\frac{M}{2}

each. Speed of light is

c

. The speed of daughter nuclei is

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Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 9 - Modern Physics>Objective Problems [Level 2]>Q 73

The de-Broglie wavelength of the electron in the ground state of the hydrogen atom is (radius of the first orbit of the hydrogen atom

= 0 .53 \overset{\circ}{A}

)

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Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 9 - Modern Physics>Objective Problems [Level 2]>Q 74

According to Einstein's photoelectric equation, the graph of

K . E .

of the photoelectron emitted from the metal versus the frequency of the incident radiation gives a straight line graph, whose slope

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Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 9 - Modern Physics>Objective Problems [Level 2]>Q 75

An electron is moving in an orbit of a hydrogen atom from which there can be a maximum of six transitions. An electron is moving in an orbit of another hydrogen atom from which there can be a maximum of three transitions. The ratio of the velocities of the electron in these two orbits is

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Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 9 - Modern Physics>Objective Problems [Level 2]>Q 76

ν_{1}

is the frequency of the series limit of the Lyman series,

ν_{2}

is the frequency of the first line of the Lyman series and

ν_{3}

is the frequency of the series limit of the Balmer series. Then,

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Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 9 - Modern Physics>Objective Problems [Level 2]>Q 77

The spectrum of an oil flame is an example for

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JEE Advanced

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Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 9 - Modern Physics>Objective Problems [Level 2]>Q 78

A radioactive sample

S_{1}

having the activity

A_{1}

has twice the number of nuclei as another sample

S_{2}

of activity

A_{2}

. If

A_{2} = 2 A_{1}

, then the ratio of the half-life of

S_{1}

to the half-life of

S_{2}

A radioactive nucleus (initial mass number A and atomic number Z) emits 3α-particles and 2 positrons. The ratio of the number of neutrons to that of protons in the final nucleus will be

Important Questions on Modern Physics

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A radioactive nucleus (initial mass number $A$ and atomic number $Z$ ) emits $3 α$ -particles and $2$ positrons. The ratio of the number of neutrons to that of protons in the final nucleus will be