1.
Which particle-like property of light explains the photoelectric effect?
2.
Which wave property is independent of medium?
3.
Which electromagnetic radiation has smallest wavelength listed?
4.
Wave number (̄ν) is defined as reciprocal of wavelength. If λ = 500 nm, what is wave number in cm^−1?
5.
Propagation of EM waves was explained by?
6.
In photoelectric effect, which observation contradicted classical wave theory?
7.
EM waves transport energy by?
8.
Which of the following changes will increase maximum kinetic energy of photoelectrons?
9.
If photon flux doubles while photon energy stays same (ν fixed), what changes?
10.
A metal has work function φ. If incident light has frequency ν such that hν = φ, what is the kinetic energy of emitted electrons?
11.
Which of the following will increase number of emitted electrons in photoelectric experiment (assuming ν > ν0)?
12.
In the Einstein photoelectric equation K.E. = hν − φ, what is the meaning of φ?
13.
The unit of frequency is?
14.
If the energy of a photon is E, which expression gives its wavelength?
15.
A photon of wavelength 400 nm strikes a metal with work function 2.5 eV. Photon energy in eV is (use hc = 1240 eV·nm):
16.
For a photoelectron with K.E. = 1.2 eV, what is its speed (electron mass m = 9.11×10^−31 kg)? (1 eV = 1.602×10^−19 J)
17.
Which formula correctly relates photon momentum p to wavelength λ?
18.
Speed of light is maximum in?
19.
What happens to energy of EM radiation when frequency increases?
20.
If amplitude of an EM wave doubles, intensity changes by what factor?
21.
A wave with longer wavelength carries?
22.
Why are electric and magnetic fields perpendicular in EM waves?
23.
The distance between two successive crests is?
24.
If c = 3.00×10^8 m/s and ν = 5.00×10^14 s^−1, what is λ in nm?
25.
Which statement best explains why electromagnetic waves do not require a medium?
26.
Radiation with maximum penetration power is?
27.
For a photon with frequency 6 × 10^14 s^−1, what is its approximate energy in eV? (h = 6.63×10^−34 J·s, 1 eV = 1.602×10^−19 J)
28.
When EM waves travel from air to water?
29.
According to Planck, energy of oscillator is quantized as E = nhν. Which of the following is true?
30.
For a given photon, if its frequency is doubled, its momentum becomes:
31.
What determines color of visible light?
32.
If frequency is 5 × 10^14 Hz, what is wave nature?
33.
Which is NOT a result of quantized energy levels in atoms?
34.
Which quantity is independent of the medium when an electromagnetic wave passes from one medium to another?
35.
If wavelength increases while velocity remains constant, what happens to frequency?
36.
The peak wavelength of blackbody radiation shifts with temperature according to Wien’s law: λmax ∝ 1/T. If T doubles, λmax becomes:
37.
Which region of EM spectrum has highest frequency?
38.
A wave has amplitude ‘a’. What does amplitude represent?
39.
Which statement is true about Planck’s constant h?
40.
In EM waves, energy travels due to?
41.
If frequency of a wave is doubled, wavelength becomes?
42.
Wave number 20000 cm^−1 corresponds to wavelength:
43.
If amplitude doubles, intensity becomes?
44.
Threshold frequency ν0 of a metal depends on:
45.
Which region of EM spectrum corresponds to wavelengths around 10^−10 m?
