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

2004 5 questions

1. Q1352004 · 24 Apr 2004 · Shift 1

   According to Einstein's photoelectric equation, the plot of the kinetic energy of the emitted photo electrons from a metal $Vs$ the frequency of the incident radiation gives a straight line whose slope

   1. A.depends both on the intensity of the radiation and the metal used
   2. B.depends on the intensity of the radiation
   3. C.depends on the nature of the metal used
   4. D.is the same for all metals and independent of the intensity of the radiation
   Show answer

   Answer: D

2. Q1362004 · 24 Apr 2004 · Shift 1

   The work function of a substance is $4.0\mathrm{eV}$. The longest wavelength of light that can cause photo-electron emission from this substance is approximately.

   1. A.$310\mathrm{nm}$
   2. B.$400\mathrm{nm}$
   3. C.$540\mathrm{nm}$
   4. D.$220\mathrm{nm}$
   Show answer

   Answer: A

3. Q1372004 · 24 Apr 2004 · Shift 1

   The binding energy per nucleon of deuteron $\left({}_1^{2}H\right)$ and helium nucleus $\left({}_2^{4}He\right)$ is $1.1\mathrm{MeV}$ and $7\mathrm{MeV}$ respectively. If two deuteron nuclei react to form a single helium nucleus, then the energy released is

   1. A.$23.6\mathrm{MeV}$
   2. B.$26.9\mathrm{MeV}$
   3. C.$13.9\mathrm{MeV}$
   4. D.$19.2\mathrm{MeV}$
   Show answer

   Answer: A

4. Q1382004 · 24 Apr 2004 · Shift 1

   An $\alpha$-particle of energy $5\mathrm{MeV}$ is scattered through $180^{\circ }$ by a fixed uranium nucleus. The distance of closest approach is of the order of

   1. A.$10^{-12}\mathrm{cm}$
   2. B.$10^{-10}\mathrm{cm}$
   3. C.$1\mathrm{A}$
   4. D.$10^{-15a}\mathrm{cm}$
   Show answer

   Answer: A

5. Q1442004 · 24 Apr 2004 · Shift 1

   A nucleus disintegrated into two nuclear parts which have their velocities in the ratio of $2:1$. The ratio of their nuclear sizes will be

   1. A.$3^{1/2}:1$
   2. B.$1:2^{1/3}$
   3. C.$2^{1/3}:1$
   4. D.$1:3^{1/2}$
   Show answer

   Answer: B