The work function (F) of some metals is listed below. The number of metals which will show photoelectric effect when light of 300nm wavelength falls on the metal is :

li=2.4

Na=2.3

K=2.2

Mg=3.7

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Explaination on the strength of bonds in the figure

Mam today in neet ug 2021 due to my nervousness I bubbled one wrong figure of my roll number but I have filled the roll number correctly in the blocks the invigilator adviced me to leave it as it is and to bubble the same correct figure so I did that .am very much worried what will happen

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in the stomatal apparatus why are subsidiary celss absent in cucurbits?