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