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In a hydrogen spectrum if electron moves from 7 to 1 orbit by transition in multi steps then find out the total number of lines in the spectrum.

Solution: Lyman = (n7 – 1) = 7 – 1 = 6 Balmer = (n7 – 2) = 7 –... View Article

Find out the longest wavelength of absorption line for hydrogen gas containing atoms in ground state.

For longest wavelength ΔE should be smallest i.e. transition occurs from n = 1 to n = 2 i.e. 1/λ... View Article

Name some spectrum lines named after the scientists who discovered them

Like the Balmer series is the part of the hydrogen emission spectrum which is generated by the excitation of an... View Article

Explain the balmer and rydberg equations

It was in 1885 when Balmer first of all came up with a simple formula for predicting the wavelength of... View Article

Explain hydrogen spectrum wavelength in details

When a hydrogen atom absorbs a photon, it causes the electron to experience a transition to a higher energy level,... View Article

Explain what is hydrogen spectrum?

When Hydrogen gas is passed through a discharge tube (A hydrogen discharge tube is a slim tube containing hydrogen gas... View Article

Explain hund’s rule and spectroscopic term of the ground state of an atom

Hund’s rule predicts the stable state of an atom to have large number of unpaired electrons (High spin configuration). The... View Article

Explain hund’s rule and electronic configuration

While all the three Hund’s rule is need for the understanding of the fine spectra of atoms, the first rule... View Article

What is hund’s rule of multiplicity?

Introduction Atoms, contains protons and neutrons in the nucleus at the center and electrons revolving around nucleus. The attractive force... View Article

Two bulbs are marked (a) 100 w and 220 v (b) 40 w and 220 v. which has higher resistance?

Solutions: Here E1 = 220 V P1 = 100 W E2 = 220 V P2 = 40 W (a) P1... View Article

1000 w heater is used 6 hours daily and the cost of 1 unit of electricity is 40 p. how much will it cost in the month of november?

Solution: Here P = 1000 t = 6 × 30 = 180 hours Energy consumed \(\begin{array}{l}=frac{Ptimes t}{1000}\end{array} \) \(\begin{array}{l}=frac{1000times 180}{1000}\end{array}... View Article

What voltage drop will be there across a 1 kw electric heater element whose resistance when hot is 40 ohms?

Solutions: Here P = 1 k W = 1000 W R = 40 ohms P = VI Or \(\begin{array}{l}P=frac{Vtimes V}{R}=frac{{{V}^{2}}}{R}\end{array}... View Article

Two electric lamps are rated for 220 volts 60 watts, and 220 volts 40 watts. find the heat generated in each lamp per second when they are connected in series across 220 volts.

Solution: P1 = 60 watts E1 = 220 volts \(\begin{array}{l}{{P}_{1}}=text{ }{{E}_{1}}{{I}_{1}}=frac{E_{1}^{2}}{{{R}_{1}}}\end{array} \) \(\begin{array}{l}{{R}_{1}}=frac{E_{1}^{2}}{{{P}_{1}}}\end{array} \) \(\begin{array}{l}{{R}_{1}}=frac{{{left( 220 right)}^{2}}}{60}=frac{2420}{60}ohms\end{array} \) Power of... View Article

An electric kettle takes 4 amperes when put on a circuit of 250 volts. calculate the time required to prepare two cups calculate the cost at the rate of 20 p per unit

Solution: Mass of water = 450 g Rise in temp = 100 – 20 = 800C Heat produced = 450... View Article

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