Science (English Medium) Class 12 - CBSE Question Bank Solutions

Which of the following statement is true?

Which of the following statements is false for a perfect conductor?

Two a-particles have the ratio of their velocities as 3 : 2 on entering the field. If they move in different circular paths, then the ratio of the radii of their paths is ______.

Let the magnetic field on earth be modelled by that of a point magnetic dipole at the centre of earth. The angle of dip at a point on the geographical equator is ______.

Identify the wrong statement.

Three Charges 2q, -q and -q lie at vertices of a triangle. The value of E and V at centroid of triangle will be ______.

A solid spherical conductor has charge +Q and radius R. It is surrounded by a solid spherical shell with charge -Q, inner radius 2R, and outer radius 3R. Which of the following statements is true?

Hydrogen spectrum consists of discrete bright lines in a dark background and it is specifically known as hydrogen emission spectrum. There is one more type of hydrogen spectrum that exists where we get dark lines on the bright background, it is known as absorption spectrum. Balmer found an empirical formula by the observation of a small part of this spectrum and it is represented by

`1/lambda = "R"(1/2^2 - 1/"n"^2)`, where n = 3, 4, 5,....

For Lyman series, the emission is from first state to n^th state, for Paschen series, it is from third state to n^th state, for Brackett series, it is from fourth state to n^th state and for P fund series, it is from fifth state to n^th state.

Number of spectral lines in hydrogen atom is ______.

Hydrogen spectrum consists of discrete bright lines in a dark background and it is specifically known as hydrogen emission spectrum. There is one more type of hydrogen spectrum that exists where we get dark lines on the bright background, it is known as the absorption spectrum. Balmer found an empirical formula by the observation of a small part of this spectrum and it is represented by

`1/lambda = "R"(1/2^2 - 1/"n"^2)`, where n = 3, 4, 5,....

For Lyman series, the emission is from first state to n^th state, for Paschen series, it is from third state to n^th state, for Brackett series, it is from fourth state to n^th state and for P fund series, it is from fifth state to n^th state.

Which series of hydrogen spectrum corresponds to ultraviolet region?

Hydrogen spectrum consists of discrete bright lines in a dark background and it is specifically known as hydrogen emission spectrum. There is one more type of hydrogen spectrum that exists where we get dark lines on the bright background, it is known as absorption spectrum. Balmer found an empirical formula by the observation of a small part of this spectrum and it is represented by

`1/lambda = "R"(1/2^2 - 1/"n"^2)`, where n = 3, 4, 5,....

For Lyman series, the emission is from first state to n^th state, for Paschen series, it is from third state to n^th state, for Brackett series, it is from fourth state to n^th state and for P fund series, it is from fifth state to n^th state.

Which of the following lines of the H-atom spectrum belongs to the Balmer series?

Hydrogen spectrum consists of discrete bright lines in a dark background and it is specifically known as hydrogen emission spectrum. There is one more type of hydrogen spectrum that exists where we get dark lines on the bright background, it is known as absorption spectrum. Balmer found an empirical formula by the observation of a small part of this spectrum and it is represented by

`1/lambda = "R"(1/2^2 - 1/"n"^2)`, where n = 3, 4, 5,....

For Lyman series, the emission is from first state to n^th state, for Paschen series, it is from third state to n^th state, for Brackett series, it is from fourth state to n^th state and for P fund series, it is from fifth state to n^th state.

Rydberg constant is ______.

What are eddy currents?