CUET (UG) entrance exam Question Bank Solutions for Physics

The radius of electron's second stationary orbit in Bohr's atom is R. The radius of 3^rd orbit will be:-

The ratio of the frequencies of the long wave length its of Lyman Balmer series of hydrogen spectrum is

Which of the following transition in a hydrogen atom emit photon of the highest frequency:

The ratio active Nude 7N¹³ decays 6C¹³ through the emission of

An alpha particle has

In 88 Ra²²⁶ nucleus, there are

Nucleolus of an atom of mass No. 24 and charge no. 11 consists of

The ratio of minimum to max^m wavelength in ballmer series is:-

A parallel beam of light ray parallel to the x-axis is incident on a parabolic reflecting surface x = 2by² as shown in the figure. After reflecting it passes through focal point F. What is the focal length of the reflecting surface?

On the basis of Bohr's model, the approximate radius of Li⁺⁺ ion in its ground state ifthe Bohr radius is a₀ = 53 pm : 

A TV tower has a height of 100 meter. If the coverage range is to be made three times then the height of the tower should be increased by.

Of the diodes shown in the following diagrams, which one is reverse biased?

The current through an ideal PN-junction shown in the following circuit diagram will be:

According to the Bohr theory of H-atom, the speed of the electron, its energy and the radius of its orbit varies with the principal quantum number n, respectively, as:

The area of the region covered by the TV broadcast by a TV tower of 100 m height is (Radius of the earth = 6.4 × 10⁶ m):

The drift current in a p-n junction is from the ______.

The intensity of a point source of light, S, placed at a distance d in front of a screen A, is I₀ at the center of the screen. Find the light intensity at the center of the screen if a completely reflecting plane mirror M is placed at a distance d behind the source, as shown in the figure.

If the resistivity of an alloy is P and that of constitute metal is P₁ then

In form of Rydberg's constant R, the wave no of this first Ballmer line is

The wavelength of the first time line of Ballmer series is 6563 A°. The Rydberg constant for hydrogen is about:-