- AUltraviolet
- BVisible
- CInfrared
- DPartially Visible
Explanation:
Balmer series lies in the visible spectrum.
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When the P end of P-N junction is connected to the negative terminal of the battery and the N end to the positive terminal of the battery, then the P-N junction behaves like
|
(a) A conductor |
(b) An insulator |
(c) A super-conductor |
(d) A semi-conductor |
Three capacitors of capacity
are connected in series. Their total capacity will be
|
(a) |
(b) 1/ |
|
(c) ( |
(d) None of these |
The electric potential V is given as a function of distance x (metre) by
)volt. Value of electric field at x = 1 is
|
(a) 20 V/m |
(b) 6 V/m |
(c) 11 V/m |
(d) -23 V/m |
The third line of Balmer series of an ion equivalent to hydrogen atom has wavelength of 108.5 nm. The ground state energy of an electron of this ion will be
|
(a) 3.4 eV |
(b) 13.6 eV |
(c) 54.4 eV |
(d) 122.4 eV |
Consider a radioactive material of half-life 1.0 minute. If one of the nuclei decays now, the next one will decay
|
(a) After 1 minute |
|
(b) After |
|
(c) After |
|
(d) After any time |
Every series of hydrogen spectrum has an upper and lower limit in wavelength. The spectral series which has an upper limit of wavelength equal to 18752 Å is (Rydberg constant
per metre)
|
(a) Balmer series |
(b) Lyman series |
(c) Paschen series |
(d) Pfund series |
A circular disc of which 2/3 part is coated with yellow and 1/3 part is with blue. It is rotated about its central axis with high velocity, then it will be seen as
|
(a) Green |
(b) Brown |
(c) White |
(d) Violet |