Home
Class 12
PHYSICS
Given below are some famous numbers asso...

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.
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].

Text Solution

Verified by Experts

Given `T=2.7^(@) K` As `lambda_(m) T=0.29cm ""^(@)k`
`therefore lambda_(m)=(0.29)/(T)=(0.29)/(2.7)~~0.11` cm
This wavelength corresponds to microwave region of the electromagnetic spectrum .
Promotional Banner

Topper's Solved these Questions

  • ELECTROMAGNETIC WAVE

    VIKRAM PUBLICATION ( ANDHRA PUBLICATION)|Exercise TEXTUAL EXERCISES|17 Videos

  • ELECTROMAGNETIC INDUCTION

    VIKRAM PUBLICATION ( ANDHRA PUBLICATION)|Exercise Additional EXERCISES|15 Videos

  • ELECTROSTATIC POTENTIAL AND CAPACITANCE

    VIKRAM PUBLICATION ( ANDHRA PUBLICATION)|Exercise SAQs|4 Videos

Similar Questions

Explore conceptually related problems

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. 5890 Å -5896 Å [double lines of sodium].

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. 21 cm (wavelength emitted by atomic hydrogen in interstellar space).

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. 1057 MHz (frequency of radiation arising from two close energy levels in hydrogen, known as Lamb shift).

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. 14.4 keV [energy of a particular transition in ""^(57)Fe nucleus associated with a famous high resolution spectroscopic method (Mossbauer spectroscopy).

The only electron in the hydrogen atom resides under ordinary conditions on the first orbit. When energy is supplied, the electron moves to higher energy orbit depending on the amount of energy absorbed. When this electron returns to any of the lower orbits, it emits energy. Lyman series is formed when the electron returns to the lowest orbit while Balmer series is formed when the electron returns to second orbit. Similarly, Paschen, Brackett and Pfund series are formed when electron returns to the third, fourth orbits from higher energy orbits respectively (as shown in figure) Maximum number of lines produced when an electron jumps from nth level to ground level is equal to (n(n-1))/(2) . For example, in the case of n = 4, number of lines produced is 6. (4 rarr 3, 4 rarr 2, 4 rarr 1, 3 rarr 2, 3 rarr 1, 2 rarr 1) . When an electron returns from n_(2) to n_(1) state, the number of lines in the spectrum will be equal to ((n_(2) - n_(1))(n_(2)-n_(1) +1))/(2) If the electron comes back from energy level having energy E_(2) to energy level having energy E_(2) then the difference may be expressed in terms of energy of photon as E_(2) - E_(1) = Delta E, lambda = (h c)/(Delta E) . Since h and c are constant, Delta E corresponds to definite energy, thus each transition from one energy level to another will prouce a higher of definite wavelength. THis is actually observed as a line in the spectrum of hydrogen atom. Wave number of the line is given by the formula bar(v) = RZ^(2)((1)/(n_(1)^(2)) - (1)/(n_(2)^(2))) Where R is a Rydberg constant (R = 1.1 xx 10^(7)) (i) First line of a series : it is called .line of logest wavelength. or .line of shortest energy.. (ii) Series limit of last of a series : It is the line of shortest wavelength or line of highest energy. The wave number of electromagnetic radiation emitted during the transition of electron in between two levels of Li^(2+) ion whose principal quantum numbers sum if 4 and difference is 2 is

An orbital is designated by certain values of first three quantum numbers (n, l and m) and according to Pauli.s exclusion principle, no two electrons in a atom can have all the for quantum numbers equal. N, l and m denote size, shape and orientation of the orbital. The permissible values of n are 1,2,3.... prop while that of 1 are all possible integral values from 0 to n-n. Orbitals with same values of n and 1 but different values of m (where m can have any integral values from 1 to +1 including zero) are of equal energy and are called degenerate orbitals. However degeneracy is destroyed in homogeneous external magnetic field due to different extent of interaction between the applied field and internal electronic magnet of different orbitals differing in orientations. In octahedral magnetic field external magnetic field as oriented along axes while in tetrahedral field the applied field actas more in between the axes than that on the axes themselves. For 1=0, 1,2,3,...., the states (called sub-shells) are denoted by the symbol s,p,d,f.....respectively. After f, the subshells are denoted by letters alphabetically 1 determines orbital angular motion (L) of electron as L = sqrt(l(l+1))(h)/(2pi) ON the other hand, m determines Z-component of orbital angular momentum as L_(Z) = m((h)/(2pi)) Hund.s rule states that in degenerate orbitals electrons do not pair up unless and until each each orbitals has got an electron with parallesl spins Besides orbital motion,an electron also posses spin-motion. Spin may be clockwise and anticloskwise. Both these spin motions are called two spins states of electrons characterized by spin Q.N (s) : s = +(1)/(2) and = -(1)/(2) respectively The sum of spin Q.N. of all the electrons is called total spin(s) and 2s+1 is called spin multiplicity of the configuration as a whole. The spin angular momentum of an electron is written as L_(s) = sqrt(s(s+1))(h)/(2pi) According to Hund.s rule, the distribution of electron within the various orbitals of a given sub-shell is one which is associated with

VIKRAM PUBLICATION ( ANDHRA PUBLICATION)-ELECTROMAGNETIC WAVE-ADDITIONAL EXERCISES
  1. Suppose that the electric field part of an electromagnetic wave in vac...

    Text Solution

    |

  2. Suppose that the electric field part of an electromagnetic wave in vac...

    Text Solution

    |

  3. Suppose that the electric field part of an electromagnetic wave in vac...

    Text Solution

    |

  4. Suppose that the electric field part of an electromagnetic wave in vac...

    Text Solution

    |

  5. Suppose that the electric field part of an electromagnetic wave in vac...

    Text Solution

    |

  6. About 5% of the power of a 100 W light bulb is converted to visible ra...

    Text Solution

    |

  7. About 5% of the power of a 100 W light bulb is converted to visible ra...

    Text Solution

    |

  8. Use the formula lambda(m)T=0.29 cm K to obtain the characteristic temp...

    Text Solution

    |

  9. Given below are some famous numbers associated with electromagnetic ra...

    Text Solution

    |

  10. Given below are some famous numbers associated with electromagnetic ra...

    Text Solution

    |

  11. Given below are some famous numbers associated with electromagnetic ra...

    Text Solution

    |

  12. Given below are some famous numbers associated with electromagnetic ra...

    Text Solution

    |

  13. Given below are some famous numbers associated with electromagnetic ra...

    Text Solution

    |

  14. Long distance radio broadcasts use short-wave bands . Why ?

    Text Solution

    |

  15. It is neccessary to use satellites for long distance TV transmission. ...

    Text Solution

    |

  16. Optical and radio telescopes are built on the ground but X-ray astrono...

    Text Solution

    |

  17. The small ozone layer on top of the stratosphere is crucial for human ...

    Text Solution

    |

  18. If the earth did not have an atmosphere, would its average surface tem...

    Text Solution

    |

  19. Some scientists have predicited that a global nuclear war on the earth...

    Text Solution

    |