Category: Class 12th NCERT

Astronomical Telescope Class 12 | Astronomical Telescope

Astronomical Telescope Class 12 | Astronomical Telescope Astronomical Telescope Class 12 | Astronomical Telescope :- An optical instrument designed for astronomical observation that uses lenses to collect light from celestial objects, resulting in detailed, magnified and clear images of stars, planets, galaxies and other astronomical phenomena, is called an astronomical refracting type telescope. Astronomical…

Class 12th NCERT

Telescope

Telescope Telescope :- A telescope is an optical instrument that produces large images of distant objects by providing angular magnification to enable observation of them. It works by collecting and focusing light through a combination of lenses and/or mirrors. Many objects like stars, planets, galaxies are many times bigger than our Earth, but due…

Compound Microscope

Compound Microscope Compound Microscope :- A microscope made by combining two or more lenses to magnify extremely small objects is called a compound microscope. In this, the effect (magnification) of one lens is further increased by the other lens. Structure of Compound Microscope In this, a convex lens (O) of short focal length and…

Simple Microscope

Simple Microscope Definition of Simple Microscope A simple microscope or magnifying lens is a convex lens of short focal length. Principle of Simple Microscope When an object is placed in front of a convex lens between the optical center and focus on the principal axis, a virtual, erect and magnified image of the object…

If the momentum of an electron is changed by p

If the momentum of an electron is changed by p Question :- If the momentum of an electron is changed by P, then the de-Broglie wavelength associated with it changes by 0.5 %. The initial momentum of an electron will be : (A) 400P (B) P/200 (C) 100P (D) 200P Solution :- Let initial…

Class 12th NCERT, Questions

Monochromatic radiation emitted when electron on hydrogen atom jumps from

Monochromatic radiation emitted when electron on hydrogen atom jumps from Question :- Monochromatic radiation emitted when electron on hydrogen atom jumps from first exited to the grounds state irradiates a photosensitive material. The stopping potential is measured to be 3.57V. The threshold frequency of the material is : (A) 2.5 × 1015 Hz…

Questions, Class 12th NCERT

A proton and photon both have same energy

A proton and photon both have same energy Question :- A proton and photon both have same energy of E = 100 keV. The de-Broglie wavelength of proton and photon be λ1 and λ2 then λ1/λ2 is proportional to (A) E-1/2 (B) E1/2 (C) E-1 (D) E Solution:- de Broglie wavelength associated with a…

Class 12th NCERT, Questions

Relation between wavelength of photon and electron of same energy is

Relation between wavelength of photon and electron of same energy is Question :- Relation between wavelength of photon and electron of same energy is (A) (B) (C) (D) Solution :- As de Broglie wavelength associated with an electron is given by …..(1) And for photon …..(2) Using this value in…

Class 12th NCERT, Questions

Symmetry In Electrical Circuits

Symmetry In Electrical Circuits Symmetry In Electrical Circuits :- Symmetry in electrical circuits refers to the balanced and consistent arrangement of components and connections, simplifying circuit analysis and design. This method is based on identification of equipotential points and after connecting them to make calculations more manageable and predictable. In a given electrical circuit…

Class 12th NCERT

Electrical Energy

Electrical Energy Electrical Energy :- When an electric current is passed through a conductor by a battery, the chemical energy stored inside the battery is converted into the kinetic energy of free electrons in the conductor. Due to continuous collision of free electrons with atoms in the conductor, the kinetic energy of the electrons…