MCQ
The wavelength of light used in an optical instrument is $\lambda_1=4000 Å$ and $\lambda_2=5000 Å$. The ratio of their corresponding resolution powers will be :
- A$16: 25$
- B$9: 1$
- C$4: 5$
- ✓$5: 4$
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When the length of a microscope tube increases, its magnifying power:
Order of magnitude of density of uranium nucleus is (![]()
|
(a) |
(b) |
(c) |
(d) |
The kinetic energy of an electron is 5 eV. Calculate the de-Broglie wavelength associated with it (h = 6.6 × 10–34 Js, me = 9.1 × 10–31 kg)
|
(a) 5.47 Å |
(b) 10.9 Å |
(c) 2.7 Å |
(d) None of these |
When hydrogen atom is in its first excited level, its radius is .... its ground state radius
|
(a) Half |
(b) Same |
(c) Twice |
(d) Four times |
If the work function of a photometal is 6.825 eV. Its threshold wavelength will be (c = 3 ![]()
|
(a) 1200 Å |
(b) 1800 Å |
(c) 2400 Å |
(d) 3600 Å |