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