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