- AMicro waves
- BRadio waves
- ✓X-rays
- DInfrared rays
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The distance of the eye-lens from the retina is x. For a normal eye, the maximum focal length of the eye-lens:
A LC circuit is in the state of resonance. If C = 0.1μF and L = 0.25 henry. Neglecting ohmic resistance of circuit what is the frequency of oscillations
|
(a) 1007 Hz |
(b) 100 Hz |
(c) 109 Hz |
(d) 500 Hz |
An achromatic prism is made by combining two prisms and
; where μ represents the refractive index. If the angle of the prism
is 10°, then the angle of the prism P2 will be
|
(a) 5° |
(b) 7.8° |
(c) 10.6° |
(d) 20° |
In Fig. X represents time and Y represent activity of a radioactive sample. Then the activity of sample, varies with time according to the curve
|
(a) A |
(b) B |
(c) C |
(d) D |
The ratio of the energies of the hydrogen atom in its first to second excited state is
|
(a) 1/ 4 |
(b) 4/9 |
(c) 9/ 4 |
(d) 4 |