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