Dual Nature of Matter and Radiation
Physics ⇒ Modern Physics
Dual Nature of Matter and Radiation starts at 11 and continues till grade 12.
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See sample questions for grade 11
A beam of electrons is accelerated through a potential difference of 100 V. Calculate the de Broglie wavelength of the electrons. (e = 1.6 × 10-19 C, m = 9.1 × 10-31 kg, h = 6.63 × 10-34 Js)
A metal surface is illuminated with light of frequency 2 × 1015 Hz. If the work function is 3.2 × 10-19 J, calculate the maximum kinetic energy of the emitted photoelectrons. (h = 6.63 × 10-34 Js)
A photon has a wavelength of 400 nm. Calculate its energy. (h = 6.63 × 10-34 Js, c = 3 × 108 m/s)
Calculate the de Broglie wavelength of an electron moving with a velocity of 2.2 × 106 m/s. (Mass of electron = 9.1 × 10-31 kg, h = 6.63 × 10-34 Js)
Describe the dual nature of matter.
Explain why electrons do not escape from a metal surface when illuminated with light of frequency below the threshold frequency, regardless of intensity.
Explain why the de Broglie wavelength of a macroscopic object is not observable.
Explain why the photoelectric effect supports the particle nature of light.
If the work function of a metal is 2.0 eV, what is the threshold wavelength for photoemission from this metal? (h = 6.63 × 10-34 Js, c = 3 × 108 m/s, 1 eV = 1.6 × 10-19 J)
Name the scientist who first explained the photoelectric effect using the quantum theory of light.
State Planck's quantum hypothesis.
The energy of a photon is given by E = hν. What does 'h' represent in this equation?
What is meant by the term 'photon'?
What is the significance of the Compton effect in understanding the nature of light?
What is the threshold frequency in the context of the photoelectric effect?
What is the value of Planck's constant (h) in SI units?
Who proposed the concept of wave-particle duality for matter?
A beam of electrons is diffracted by a crystal. If the accelerating voltage is increased, what happens to the angle of diffraction? Explain your answer.
A metal surface is illuminated with two different monochromatic lights, one with frequency just above the threshold frequency and the other with much higher frequency. Explain the difference in the kinetic energy of the emitted photoelectrons.
A neutron and a proton are accelerated through the same potential difference. Which will have a shorter de Broglie wavelength? Explain your reasoning.
