Why is this fact (two photon absorption) not taken into consideration in our discussion of the stopping potential?

Paragraph based questions : Read the following paragraph and answer, the questions based on it. The presence or absence of organs is the first criterion for classification of plants. The presence or absence of separate conducting tissues for conduction of water and food is the next consideration for classification. Do the plants bear seeds? If they do then, whether the seeds are enclosed in a fruit or not is also an important criterion for classification. Finally, plants are grouped depending upon the number of cotyledons in the seeds. In 1883, Eichler, a botanist, classified the Kingdom Plantae into two sub-kingdoms. As a result, two sub-kingdoms, cryptogams and phanerogams were considered for plant classification. Which criteria are taken into account while classifying the lower groups of the plants?

Photon having wavelength lambda = 3.5xx10^(-7)m and lambda = 5.4xx10^(-7)m incident on a metal surface successively, let in both cases the ration of their stopping potential is 2 : 1, find work function :

Photons with energy 5 eV are incident on a cathode C in a photoelectric cell . The maximum energy of emitted photoelectrons is 2 eV . When photons of energy 6 eV are incident on C , no photoelectrons will reach the anode A , if the stopping potential of A relative to C is

The maximum kinetic energy of photoelectrons emitted from a surface when photons of energy 6 eV fall on it is 4 eV . The stopping potential , in volt is

Students were taken on a field trip to a national park. They were curious to observe the threatened wild species. They noted down their spotting and discussed the same observations with their teacher. A group of students observed lion tailed macaque and musk deer, but the other group could only spot Lesser florican. Mention any two categories of threatened species.

Students were taken on a field trip to a national park. They were curious to observe the threatened wild species. They noted down their spotting and discussed the same observations with their teacher. A group of students observed lion tailed macaque and musk deer, but the other group could only spot Lesser florican. Mention any two other examples of threatened species.

Questions based on Paragraph : Seemas and shobha's mother asked both of them to take out 3 packs of 0.5 L of milk ( all at same temperature ) kept in refigerator and boil it . Seema took 1 l of milk in vessel A and shobha took rest of the milk in vessel B of same size as that of A . both the vessels are made up of same material and kept on the flame of equal intensity : Why is there a difference in the time taken to boil the milk in two vessels ?