11Ans 1) (b) , (c), (d) ???
Ans 2) (a) , (c),(d) ???
more than one correct
Q1 photoelectric effect supports quantum nature of light
a)there is min frequency below which photoelectrons are emmited
b)max KE of photoelectons depends only on frequency of light and not on intensity
c)even when metal surface is faintly illuminated hte photoelectrons leave surface immediately
d)electric charge of photo electrons is quantised
Q2 in which of the following situations is heavier particle having small de broglie wavelength.the two particles
a)move with same speed
b)move with smae linear momentum
c)move with same KE
d)have fallen same height
i think a,d...but ans is a,c,d
Single choice
Q3The energy reqd for
He+→He2++e
[IE for H atom in ground state=2.8*10-19 J/atom]
a)4.34*10-19 J/atom
b)8.68*10-19 J/atom
c)13.02*10-19 J/atom
d)16.36*10-19 J/atom
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6 Answers
11Ans 3) (I.E)z = (I.E) H Z2n2
= 2.18 * 10 - 19 * (4/1)
= 8.72 * 10 - 19 J / atom
Therefore, (b)
11. b,c.
is quantisation of charge realted to photoelectric effect?dont think so.
2. a,d.
contradiction. if a is correct(they move with same speed) and have diff masses,they must have diff KE.
1I think there needs to be a rectification in question 1 option A.
There will be a "not" before "emitted".