1. Tardigrade
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  3. Chemistry
  4. The frequency of the radiation emitted by alkali metals in the flame test follows the order :

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Q. The frequency of the radiation emitted by alkali metals in the flame test follows the order :

TS EAMCET 2019

Solution:

Alkali metals have very low ionisation energy. So, it will be very easy to eject an electron. Electrons are ejected from the surface of the metal when a radiation of suitable frequency is used in photoelectric effect.

Therefore, correct order of absorb frequency is

$K > Cs > Na > Li$