1.
In the photoelectric effect, why does increasing light intensity NOT increase kinetic energy of emitted electrons?
2.
In photoelectric experiment, electrons are emitted even if light intensity is extremely low provided ν > ν0. This proves that:
3.
Which of these phenomena require considering both wave and particle nature of light?
4.
Which of the following decreases when light enters a denser medium from vacuum?
5.
For a given metal with φ = 2.0 eV, what is threshold frequency ν0? (h = 6.626×10^−34 J·s)
6.
For light of wavelength λ, photon momentum magnitude is p = h/λ. The de Broglie wavelength of electron and photon relation is:
7.
The wavelength of a radiation is decreased from 600 nm to 300 nm. What happens to its frequency?
8.
A photon of wavelength 1240 nm has energy:
9.
Which of following is correct dimensionally for Planck constant h?
10.
An electron is struck by a photon and ejected. If photon energy exactly equals φ + K.E., and φ is doubled for same metal, to eject same K.E. you must:
11.
A monochromatic light gives stopping potential 0.5 V on a certain metal. If wavelength is decreased, stopping potential will:
12.
The Compton effect shows that:
13.
If threshold wavelength λ0 for a metal is 400 nm, what is its work function φ (in eV)? (Use 1240 eV·nm)
14.
If electron binding energy in an atom increases, threshold frequency for photoionization will:
15.
If an electron is ejected with maximum kinetic energy 2.0 eV when light of ν = 6×10^14 s^−1 is incident, what is work function φ in eV? (h = 4.136×10^−15 eV·s)
16.
Which measurement in a photoelectric experiment yields Planck’s constant h?
17.
Which radiation has the highest penetrating power?
18.
The Poynting vector represents:
19.
If an electron is ejected with kinetic energy K from a metal when light frequency ν is used, the stopping potential V0 is:
20.
Which is true about ultraviolet catastrophe and Planck’s solution?
21.
Which of these is NOT explained by quantum theory?
22.
For X-ray with λ = 0.1 nm, what is photon energy in keV? (hc = 1240 eV·nm)
23.
Which of following gives correct units for wave number?
24.
A photon has energy 4.0 × 10^-19 J. What is its corresponding wavelength?
25.
Which is true for light with very large wave number (in spectroscopy)?
26.
For blackbody, Stefan–Boltzmann law states total emitted power per unit area ∝ T^4. If temperature doubles, emitted power per unit area becomes:
27.
Which is true for blackbody radiation?
28.
A beam of light contains photons of two wavelengths 400 nm and 800 nm. Which photons carry four times the energy of the other?
29.
Which of these pairs correctly relates wavelength and energy?
30.
A metal emits electrons when illuminated with 300 nm light; with 600 nm light it does not. What can be inferred about work function?
31.
A photon exerts radiation pressure on a surface. Radiation pressure is related to photon momentum p by:
32.
Which of the following correctly compares X-rays and microwaves?
33.
Which of the following expresses relation between energy, frequency and wavelength?
34.
A metal surface has threshold frequency ν0. If incident frequency ν = 1.5 ν0 and stopping potential is V0, what happens to V0 if frequency doubled?
35.
A metal has a threshold frequency of 6 × 10^14 Hz. Light of frequency 9 × 10^14 Hz is incident. What is the kinetic energy of the emitted electrons?
36.
In spectroscopy, high wave number corresponds to:
37.
Which formula gives energy of photon in J when wavelength λ in meters is known?
38.
The energy density of an electromagnetic wave is proportional to:
39.
In Einstein’s photoelectric equation, which term represents threshold condition?
40.
A monochromatic light of intensity I hits a metal surface. Doubling intensity will:
41.
If the intensity of monochromatic light is raised, which of the following increases linearly?
42.
Which of these values corresponds to visible spectrum wavelength range?
43.
The work function for sodium is 2.3 eV. What is threshold wavelength λ0?
44.
Photoelectric effect demonstrates which property of light?
45.
Which experimental observation allowed Einstein to propose photon concept?
