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The correct representation of wavelength intensity relationship of an ideal black body radiation at two different temperatures T1 and T2 is

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Important Questions on Structure of Atom

EASY
A carrot looks orange in colour because of the β carotene molecule in it. This means that the β carotene molecule absorbs light of wavelengths,
EASY
Which of the following is correct?
EASY
The energy of the em waves is of the order of 15 keV. To which part of the spectrum does it belong?
EASY

Consider the following
(i) Submarine communications
(ii) A.M. radio
(iii) Shortwave ratio
(iv) Radar

Arrange the above in increasing frequency of the waves associated with them

MEDIUM
The spectrum of Helium is expected to be similar to that of____
EASY
The E.M. wave with shortest wavelength among the following is
EASY

The number of following statement/s which is/are incorrect is ______

A) Line emission spectra are used to study the electronic structure

B) The emission spectra of atoms in the gas phase show a continuous spread of wavelength from red to violet.

C) An absorption spectrum is like the photographic negative of an emission spectrum

D) The element helium was discovered in the sun by spectroscopic method

EASY
Name the electromagnetic radiations used for eye surgery.
MEDIUM
The product obtained after positron emission from Ga3168 is
EASY

Which one of the following has the highest wavelength?

EASY
The speed of X-rays is the same as that of visible light. Hence its wavelength is
EASY
78) There are two statements, one labelled as Assertion (A) and the other as Reason (R). Examine both the statements carefully and mark the correct choice.
(A) Hydrogen has one electron in its orbit but it produces several spectral lines.
(R) There are many excited energy levels available.
EASY
Name the electromagnetic radiations used for (a) water purification, and (b) eye surgery.
MEDIUM
An electromagnetic radiation is used for photography in fog.
(i) Identify the radiation.
(ii) Why is this radiation mentioned by you, ideal for this purpose?                                                       
MEDIUM
Which mode of propagation is used by short wave broadcast services ?
EASY
The order of wavelength of visible rays is
EASY
Why are infra-red waves often called heat waves ? Explain.
MEDIUM
The Lyman series corresponds to the emission lines of hydrogen atom due to the transitions of the type n1(21,31,41, etc ) where n is the principal quantum number of the excited state. The ionization energy of the hydrogen atom can be determined by plotting:
MEDIUM
The ratio of the highest to the lowest wavelength of Lyman series is
MEDIUM
Which of the following statements is false?