Dual Nature, Atoms & Nuclei · JEE Main previous year questions

2022 28 questions

1. Q492022 · 25 Jun 2022 · Shift 2
   
   1. A.
   2. B.
   3. C.
   4. D.
   Show answer

   Answer: B

2. Q472022 · 24 Jun 2022 · Shift 2

   The light of two different frequencies whose photons have energies 3.8 eV and 1.4 eV respectively, illuminate a metallic surface whose work function is 0.6 eV successively. The ratio of maximum speeds of emitted electrons for the two frequencies respectively will be :

   1. A.1 : 1
   2. B.2 : 1
   3. C.4 : 1
   4. D.1 : 4
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   Answer: B

3. Q492022 · 24 Jun 2022 · Shift 2

   In Bohr's atomic model of hydrogen, let K, P and E are the kinetic energy, potential energy and total energy of the electron respectively. Choose the correct option when the electron undergoes transitions to a higher level :

   1. A.All K, P and E increase.
   2. B.K decreases, P and E increase.
   3. C.P decreases, K and E increase.
   4. D.K increases, P and E decrease.
   Show answer

   Answer: B