What is continuous spectrum?


When white light from the sun or candle or electrical bulb is passed through a prism and is analysed with a spectroscope, it is found that it gets split up or analysed into a continuous band of seven colours from red to violet (VIBGYOR). This phenomenon is known as dispersion and the pattern of colours obtained is known as continuous spectrum.
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The threshold frequency v0 for a metal is 7.0 X 1014s-1. Calculate the kinetic energy of an electron emitted when radiation of frequency v = 1.0 X 1015 s-1 hits the metal. 


According to Einstein equation.

Substituting the values, we have
    
            
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The wavelength range of the visible spectrum extends from violet (400 nm) to red (750 nm). Express these wavelengths in frequencies (Hz). [1 nm = 10-9 m]


Frequency of violet light, 

   

Frequency of red light,

     

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What do you mean by absorption spectra?


If a white light from a white hot object is passed through a particular material (say sodium vapours), it is found that wavelengths of certain energies are absorbed by this material giving rise to a spectrum having black lines corresponding to these absorbed wavelengths. Such a spectrum is called absorption spectrum. Absorption spectrum may be continuous, line or band spectrum depending upon the nature of the absorbing material.

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Calculate the wavelength, frequency and wave number of light wave whose period is 2.0 x 10-10 s


Here,   





                   

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