Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 9 - Modern Physics>Objective Problems [Level 2]>Q 10

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IMPORTANT

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The ionisation energy of hydrogen is $13.6 eV$ . The energy of the photon released when an electron jumps from the first excited state $(n = 2)$ to the ground state of a hydrogen atom is

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Important Questions on Modern Physics

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JEE Advanced

IMPORTANT

Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 9 - Modern Physics>Objective Problems [Level 2]>Q 11

Find the incorrect statement(s) about the photoelectric effect.

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Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 9 - Modern Physics>Objective Problems [Level 2]>Q 12

For the radioactive nuclei that undergo either

α

or

β

decay, which one of the following cannot occur?

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Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 9 - Modern Physics>Objective Problems [Level 2]>Q 13

Which of the following device is the application of the photoelectric effect?

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Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 9 - Modern Physics>Objective Problems [Level 2]>Q 14

The monochromatic light of frequency

3 \times 10^{14} Hz

, which is produced by a laser, emits the power of

3 \times 10^{- 3} W

. Find, how many photons are emitted per second?

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Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 9 - Modern Physics>Objective Problems [Level 2]>Q 15

The ratio of radii of nuclei of two atoms of element of atomic mass numbers

27

and

64

is

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Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 9 - Modern Physics>Objective Problems [Level 2]>Q 16

The value of Rydberg constant is

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Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 9 - Modern Physics>Objective Problems [Level 2]>Q 17

The total energy of an electron in

4^{th}

orbit of the hydrogen atom is

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Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 9 - Modern Physics>Objective Problems [Level 2]>Q 18

The work functions of silver and sodium are

4.6

and

2.3 eV

, respectively. The ratio of the slope of the stopping potential versus frequency plot for silver to that of sodium is