Ratio of the weight of H-atom to that of an electron is approximately______________?
(A) 18.336
(B) 1836
(C) 18360
(D) 183.6
Michelson calculated the speed of light using the instruments______________?
(A) spectrometer
(B) galvanometer
(C) interferometer
(D) none of these
The equation θ = 1.22 λ/D was devised by_______________?
(A) Newton
(B) Einstein
(C) Raleigh
(D) Planks
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
Michelson devised the formula to calculate the speed of light_______________?
(A) C = 4fd
(B) C = 8fd
(C) C = 16fd
(D) C = 5/2fd
In optic fiber transmission the repeater are separated through a distance of __________ km in newer system?
(A) 300km
(B) 200km
(C) 100km
(D) 20km
The penetrating power of X-rays depends on their______________?
(A) applied voltage
(B) frequency
(C) source
(D) all of the above
Bracket series is obtained when all transition of electron terminate on_______________?
(A) 4th orbit
(B) 5th orbit
(C) 3rd orbit
(D) 2nd orbit
The electric P.E of an electron in an orbit at a distance rn from the positive charge_____________?
(A) Ke2/rn
(B) Ke2/rn2
(C) ÀKe2/rn
(D) ÀKe2/rn2
Ground state energy of the 4th orbit in a H-atom is_____________?
(A) 13.60 eV
(B) 3.40 eV
(C) 0.85 eV
(D) 1.51 eV