The frequency 1057 MHz of radiation aris...

The frequency `1057 MHz` of radiation arising from two close energy levels in hydrogen belong to:

radio waves

infrared waves

microwaves

`gamma`-rays

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Given below are some famous numbers associated with electromagnetic radiations in different contexts in physics. State the part of the electromagnetic spectrum to which each belongs. (a) 21 cm (wavelength emitted by atomic hydrogen in interstellar space). (b) 1057 MHz (frequency of radiation arising from two close energy levels in hydrogen, known as Lamb shift). (c) 2.7 K [temperature associated with the isotropic radiation filling all space-thought to be a relic of the ‘big-bang’ origin of the universe]. (d) 5890 hatA-5896hatA (double lines of sodium] (e) 14.4keV energy of a particular transition in .^(57)Fe nucleus associated with a famour high resolution spectroscopic method (mossbauer spectroscopy).

The stopping potential for the photoelectrons emitted from a metal surface of work function 1.7 eV is 10.4 V. Find the wavelength of the radiation used. Also, identify the energy levels in hydrogen atom, which will emit this wavelength.

Calculate the ratio of the frequencies of the radiation emitted due to transition of the electron in a hydrogen atom from its (i) second permitted energy level to the first level and (ii) highest permitted energy level to the second permitted level .

A difference of 2.3 eV separates two energy levels in an atom. What is the frequency of radiation emitted when the atom transits form the upper level to the lower level.

Using Bohr's postulates, derive the expression for the frequency of radiation emitted when electron in hydrogen atom undergoes transition from higher energy state (quantum number n_(i) ) to the lower state, ( n_(f)) . When electron in hydrogen atom jumps from energy state n_(i) = 4 to n_(f) = 3, 2, 1 , identify the spectral series to which the emission lines belong.

Obtain an expression for the frequency of radiations emitted when a hydrogen atom de-excites from level n to level (n-1). for larger n, show that the frequency equals the classical frequency of revolution of the electron in the orbit.

Assertion(A) Black body is an ideal body that emits and absorbs radiations of all frequencies. Reason(R) The frequency of radiation emitted by a body goes from a lower frequency to higher frequency with an increase in temperature.

Calculate the energy and frequency of the radiation emitted when an electron jumps from n=3 to n=2 in a hydrogen atom.

What is the wavelength of light emitted when the electron in a hydrogen atom undergoes transition from the energy level with n=4 to the energy level with n=1 ?

DC PANDEY ENGLISH-ELECTROMAGNETIC WAVES-Sec A

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