Excited atoms return to their ground state in
A. 10-10s
B. 10-8s
C. 10-6s
D. 10-9s
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Physics
In hydrogen spectrum which one of the following series lies in the ultraviolet region ?
A. Balmer series
B. Pfund series
C. Bracket series
D. Lymann series
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Michelson calculated the speed of light using the instruments
A. spectrometer
B. galvanometer
C. interferometer
D. none of these
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The equation θ = 1.22 λ/D was devised by
A. Newton
B. Einstein
C. Raleigh
D. Planks
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A convex lens acts as a diverging lens if the
A. object is beyond C
B. if the object is with in C
C. if the object is within f
D. both B and C
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Michelson devised the formula to calculate the speed of light
A. C = 4fd
B. C = 8fd
C. C = 16fd
D. C = 5/2fd
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The function of collimeter in spectrometer is
A. to produce parallel beams of light
B. to filter the light rays
C. to make them
D. no function
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Errors in the transmission of power through optic fiber can be minimized by using a
A. Multimode index fiber
B. Graded index fiber
C. Single mode step index fiber
D. Copper wire
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Magnification of the astronomical telescope is
A. fo+fe
B. fo/fe
C. fe/fo
D. (1+fo/fe)L/fo
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