DUAL NATURE OF MATTER (09.10.
2024)
1.A proton, a neutron, an electron and alpha particle have same kinetic energy, then their De- Broglie
wavelengths compare as (1)
(a) λe = λp= λn = λa (b) λe>λp>λn>λa (c) λa<λp<λn<λe (d) λp = λn & λe>λa
2. When radiation of given frequency is incident upon different metals, the maximum kinetic energy of
electrons emitted – (1)
(a) decrease with increase of work function (b) increase with increase of work function
(c) remains same with the increase of work function (d) does not depend upon work function
3. Two metals A and B have work functions 2eV and 4eV,respectively. Which metal has a lower
threshold wavelength for photoelectric effect? (1)
4. Work function of Na is 2.3 eV. Does sodium show photoelectric emission for light of wavelength
6800 Å? (2)
5. An α particle and a proton are accelerated from rest by the same potential .Find the ratio of their
De-Broglie wavelengths. (2)
DUAL NATURE OF MATTER (09.10.2024)
1.A proton, a neutron, an electron and alpha particle have same kinetic energy, then their De- Broglie
wavelengths compare as (1)
(a) λe = λp= λn = λa (b) λe>λp>λn>λa (c) λa<λp<λn<λe (d) λp = λn & λe>λa
2. When radiation of given frequency is incident upon different metals, the maximum kinetic energy of
electrons emitted – (1)
(a) decrease with increase of work function (b) increase with increase of work function
(c) remains same with the increase of work function (d) does not depend upon work function
3. Two metals A and B have work functions 2eV and 4eV,respectively. Which metal has a lower
threshold wavelength for photoelectric effect? (1)
5. Work function of Na is 2.3 eV. Does sodium show photoelectric emission for light of wavelength
6800 Å? (2)
5. An α particle and a proton are accelerated from rest by the same potential .Find the ratio of their
De-Broglie wavelengths. (2)
DUAL NATURE OF MATTER (09.10.2024)
1.A proton, a neutron, an electron and alpha particle have same kinetic energy, then their De- Broglie
wavelengths compare as (1)
(a) λe = λp= λn = λa (b) λe>λp>λn>λa (c) λa<λp<λn<λe (d) λp = λn & λe>λa
2. When radiation of given frequency is incident upon different metals, the maximum kinetic energy of
electrons emitted – (1)
(a) decrease with increase of work function (b) increase with increase of work function
(c) remains same with the increase of work function (d) does not depend upon work function
3. Two metals A and B have work functions 2eV and 4eV,respectively. Which metal has a lower
threshold wavelength for photoelectric effect? (1)
6. Work function of Na is 2.3 eV. Does sodium show photoelectric emission for light of wavelength
6800 Å? (2)
5. An α particle and a proton are accelerated from rest by the same potential .Find the ratio of their
De-Broglie wavelengths. (2)
6. Draw a plot showing the variation of photoelectric current with collector plate potential for two different
frequencies, υ1 > υ2, incident radiation having the same intensity. In which case will the stopping be
higher ? Justify your answer. (2)
7. Write Einstein’s photo electric equation in terms of Stopping potential V0 and frequency of the incident
radiation (υ) for a given photo sensitive surface.Draw a suitable graph to show how one can get the
information about (i) the work function of the material and
(ii) value of Planck’s constant from this graph. (3)
8.Light of wavelength 2000A° falls on a metal surface of work function 4.2 eV. What is the kinetic energy
(in eV) of the electron emitted from the surface.
(i) What will be the change in the energy of the emitted electrons if the intensity of light with same
wavelength is doubled.
(ii) If the same light falls on on another surface of work function 6.5 eV, what will be the energy of
emitted electrons. (3)
6. Draw a plot showing the variation of photoelectric current with collector plate potential for two different
frequencies, υ1 > υ2, incident radiation having the same intensity. In which case will the stopping be
higher ? Justify your answer. (2)
7. Write Einstein’s photo electric equation in terms of Stopping potential V0 and frequency of the incident
radiation (υ) for a given photo sensitive surface.Draw a suitable graph to show how one can get the
information about (i) the work function of the material and
(ii) value of Planck’s constant from this graph. (3)
8.Light of wavelength 2000A° falls on a metal surface of work function 4.2 eV. What is the kinetic energy
(in eV) of the electron emitted from the surface.
(iii) What will be the change in the energy of the emitted electrons if the intensity of light with same
wavelength is doubled.
(iv) If the same light falls on on another surface of work function 6.5 eV, what will be the energy of
emitted electrons. (3)
6. Draw a plot showing the variation of photoelectric current with collector plate potential for two different
frequencies, υ1 > υ2, incident radiation having the same intensity. In which case will the stopping be
higher ? Justify your answer. (2)
7. Write Einstein’s photo electric equation in terms of Stopping potential V0 and frequency of the incident
radiation (υ) for a given photo sensitive surface.Draw a suitable graph to show how one can get the
information about (i) the work function of the material and
(ii) value of Planck’s constant from this graph. (3)
8.Light of wavelength 2000A° falls on a metal surface of work function 4.2 eV. What is the kinetic energy
(in eV) of the electron emitted from the surface.
(v) What will be the change in the energy of the emitted electrons if the intensity of light with same
wavelength is doubled.
(vi) If the same light falls on on another surface of work function 6.5 eV, what will be the energy of
emitted electrons. (3)
