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