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