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Q1. How much energy is needed to relocate an electron from first excited state to fourth excited state in an Hydrogen atom? Also, find the type of light needed in this process. Q2. Find the wavelength of light released when an electron jumped from 4th excited state to ground state in an Hydrogen atom. Also, name the series. Q3. Find the wavenumber of light released when an electron jumped from 5th excited state in bracket series (in H - atom). www.advguruji.blogspot.com Q4. An electron absorbed 2.55 eV energy and jumped from first excited state to nth excited state. Find n . Q5. when an electron jumped from second excited state to some different state, UV ray was released. Name the state and find the frequency of the UV ray. --------------------------------------------------------------------------------------------------- ANSWERS Ans1. 2.86 eV Ans2. 99 nm Ans3. 0.375 × 10⁶ m-¹ Ans4. n = 3 Ans5. 2.90 × 10¹⁵ Hz by    www.advguruji.blogspot.com

Q1. An electron beam has an aperture of 2 mm². A total of 7 × 10¹⁵ electrons flow through any perpendicular cross-section per second. Calculate the current density of the electron beam. Q2. The charge in a given wire varies with time, given by -     q = 3t³ - t² Where, q in 'C' and t in 'secs'. Find the current flowing in the wire at 4th second. Q3. The current flowing in a conductor is the function of time, given by -    I = 8t - 3 Where, I in 'Ampere' and t in'secs'. Find the total charge flowed in first 5 seconds in the conductor. Also, find the charge which flowed from 6th to 8th second. ----------------------------------------------------------------------             ANSWERS A1. 560 Am-² A2. 136 A A3. 85 C, 106 C Introduction to CURRENT ELECTRICITY (Basic Concepts) CLICK HERE by  www.advguruji.blogspot.com

Extra information on capacitors Q:1 Why there is low potential difference between the two conductors of a capacitor? Ans. As we know,              C = q/V So, for large capacitance of a capacitor and large amount of charge storing in a capacitor, V must be low. Also, in practicality if 'V' is large it will be result to a strong electric field between the conductors which can ionize the medium between the conductors resulting to acceleration in the charges towards the opposite charges and the charges inside the capacitor can fully or partially leaks away. Q:2 What is a capacitor? Ans. A capacitor is an energy storing device which stores energy in the form of charge hold inside the capacitor. Q:3 What is dielectric strength? Ans. It is the maximum amount of electric field of a dielectric medium so that the medium will not ionize. For example, dielectric strength of air = 3 × 10⁶ N/C. Pyaare bacchon, tumhari help   k liye mene video daali hai Q:4 List some uses of

Applications of Electrostatic shielding - 1. In a lightning thunderstorm, it is safe to sit inside a car rather than near a tree or in open ground. The metallic body of the car act as electrostatic shielding from the lightning to inside the car.  (Important point for boards) 2. In coaxial cable, the outer conductor connected to the ground provides an electrical shield to the signals carried by the central conductor. For electric potential due to an electric dipole CLICK HERE by    www.advguruji.blogspot.com