- A$r_n \propto n^{1 / 2}$
- ✓$r_n \propto n^2$
- C$r_n \propto n^2$
- D$r_n \propto n$
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The perpendicular distance between the original path of the incident ray and the convergent ray of light coming out of a glass slab is called:

Which one of the following planet has the longest day
|
(a) Venus |
(b) Mars |
(c) Mercury |
(d) Earth |
A straight wire carrying a current 10 A is bent into a semicircular arc of radius 5 cm. The magnitude of magnetic field at the center is
|
(a) 1.5 |
(b) 3.14 |
(c) 6.28 |
(d) 19.6 |

Sun radiates continuously and maintains its brightness because
|
(a) Helium is converted into iron in its core |
|
(b) Of fusion of hydrogen nuclei into helium |
|
(c) Fusion of helium in hydrogen |
|
(d) Burning of carbon, in its core |
According to Bohr's theory the radius of electron in an orbit described by principal quantum number n and atomic number Z is proportional to
|
(a) |
(b) |
(c) |
(d) |
The work function of a photoelectric material is 3.3 eV. The threshold frequency will be equal to
|
(a) 8 |
(b) 8 |
(c) 8 |
(d) 8 |