In a hydrogen atom, the distance between the electron and proton is 2.5 
. The electrical force of attraction between them will be
|
(a) 2.8 |
(b) 3.7 |
(c) 6.2 |
(d) 9.1 |
(b) 3.7 
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A spectrum is formed by a prism of dispersive power ‘ω’. If the angle of deviation is ‘δ’, then the angular dispersion is
|
(a) ω/δ |
(b) δ / ω |
(c) 1/ ωδ |
(d) ω δ |
Assertion : The colour of the green flower seen through red glass appears to be dark.
Reason : Red glass transmits only red light.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
The intensity of X-rays from a Coolidge tube is plotted against wavelength as shown in the figure. The minimum wavelength found is 
and the wavelength of the 
line is 
. As the accelerating voltage is increased
|
(a) ( |
(b) ( |
(c) |
(d) |
Which rays are not the portion of electromagnetic spectrum
|
(a) X-rays |
(b) Microwaves |
(c) a-rays |
(d) Radio waves |
