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Vachasya

Asked: April 27, 2021In: Class 10 Science

In the Arabari forest range of Midnapore district involvement of villagers helped to recover trees of

NCERT Important Questions Class 10 Science Biology Chapter 16 Important NCERT Extra Questions Chapter 16 Management of Natural Resources NCERT Book Extra Questions for Session 2022-2023 CBSE Board and UP Board Others state Board

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Vachasya

Asked: April 27, 2021In: Class 10 Science

The movement originated to end alienation of people from their forests is

NCERT Important Questions Class 10 Science Biology Chapter 16 Important NCERT Extra Questions Chapter 16 Management of Natural Resources NCERT Book Extra Questions for Session 2022-2023 CBSE Board and UP Board Others state Board

Ashok0210

Asked: April 27, 2021In: Class 12 Physics

The gravitational attraction between electron and proton in a hydrogen atom is weaker than the coulomb attraction by a factor of about 10⁻⁴⁰ .An alternative way of looking at this fact is to estimate the radius of the first Bohr orbit of a hydrogen atom if the electron and proton were bound by gravitational attraction. You will find the answer interesting.

Class 12 Physics CBSE and UP Board Atoms Chapter-12 Exercise 12.12 NCERT Solutions for Class 12 Physics Chapter 12 Question-12

Ashok0210

Asked: April 27, 2021In: Class 12 Physics

Answer the following questions, which help you understand the difference between Thomson’s model and Rutherford’s model better. (a) Is the average angle of deflection of α-particles by a thin gold foil predicted by Thomson’s model much less, about the same, or much greater than that predicted by Rutherford’s model? (b) Is the probability of backward scattering (i.e., scattering of α-particles at angles greater than 90°) predicted by Thomson’s model much less, about the same, or much greater than that predicted by Rutherford’s model? (c) Keeping other factors fixed, it is found experimentally that for small thickness t, the number of α-particles scattered at moderate angles is proportional to t. What clue does this linear dependence on t provide? (d) In which model is it completely wrong to ignore multiple scattering for the calculation of average angle of scattering of α-particles by a thin foil?

Class 12 Physics CBSE and UP Board Atoms Chapter-12 Exercise 12.11 NCERT Solutions for Class 12 Physics Chapter 12 Question-11

Ashok0210

Asked: April 27, 2021In: Class 12 Physics

In accordance with the Bohr’s model, find the quantum number that characterises the earth’s revolution around the sun in an orbit of radius 1.5 × 10¹¹ m with orbital speed 3 × 10⁴ m/s. (Mass of earth = 6.0 × 10²⁴ kg.)

Class 12 Physics CBSE and UP Board Atoms Chapter-12 Exercise 12.10 NCERT Solutions for Class 12 Physics Chapter 12 Question-10

Ashok0210

Asked: April 27, 2021In: Class 12 Physics

A 12.5 eV electron beam is used to bombard gaseous hydrogen at room temperature. What series of wavelengths will be emitted?

Class 12 Physics CBSE and UP Board Atoms Chapter-12 Exercise 12.9 NCERT Solutions for Class 12 Physics Chapter 12 Question-9

Ashok0210

Asked: April 27, 2021In: Class 12 Physics

The radius of the innermost electron orbit of a hydrogen atom is 5.3×10⁻⁻¹¹ m. What are the radii of the n = 2 and n =3 orbits?

Class 12 Physics CBSE and UP Board Atoms Chapter-12 Exercise 12.8 NCERT Solutions for Class 12 Physics Chapter 12 Question-8

Ashok0210

Asked: April 27, 2021In: Class 12 Physics

(a) Using the Bohr’s model calculate the speed of the electron in a hydrogen atom in the n = 1, 2, and 3 levels. (b) Calculate the orbital period in each of these levels.

Class 12 Physics CBSE and UP Board Atoms Chapter-12 Exercise 12.7 NCERT Solutions for Class 12 Physics Chapter 12 Question-7

Ashok0210

Asked: April 27, 2021In: Class 12 Physics

A hydrogen atom initially in the ground level absorbs a photon, which excites it to the n = 4 level. Determine the wavelength and frequency of photon.

Class 12 Physics CBSE and UP Board Atoms Chapter-12 Exercise 12.6 NCERT Solutions for Class 12 Physics Chapter 12 Question-6

Ashok0210

Asked: April 27, 2021In: Class 12 Physics

The ground state energy of hydrogen atom is –13.6 eV. What are the kinetic and potential energies of the electron in this state?

Class 12 Physics CBSE and UP Board Atoms Chapter-12 Exercise 12.5 NCERT Solutions for Class 12 Physics Chapter 12 Question-5

In the Arabari forest range of Midnapore district involvement of villagers helped to recover trees of

The movement originated to end alienation of people from their forests is

In accordance with the Bohr’s model, find the quantum number that characterises the earth’s revolution around the sun in an orbit of radius 1.5 × 10¹¹ m with orbital speed 3 × 10⁴ m/s. (Mass of earth = 6.0 × 10²⁴ kg.)

A 12.5 eV electron beam is used to bombard gaseous hydrogen at room temperature. What series of wavelengths will be emitted?

The radius of the innermost electron orbit of a hydrogen atom is 5.3×10⁻⁻¹¹ m. What are the radii of the n = 2 and n =3 orbits?

(a) Using the Bohr’s model calculate the speed of the electron in a hydrogen atom in the n = 1, 2, and 3 levels. (b) Calculate the orbital period in each of these levels.

A hydrogen atom initially in the ground level absorbs a photon, which excites it to the n = 4 level. Determine the wavelength and frequency of photon.

The ground state energy of hydrogen atom is –13.6 eV. What are the kinetic and potential energies of the electron in this state?

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