864 NC-1
150 NC-1
144 NC-1
18 NC-1
Correct answer is A
In general, electric field strength E = (F)/q
E = \(\frac{q}{4\pi\varepsilon_0d^2}\)
⇒ 360 = \(\frac{9\times10^9\times50\times10^-6}{d^2}\)
solving, we have \(d^2\) = 1250
putting \(d^2\) = 1250 into the second equation,
E = \(\frac{9\times10^9\times120\times10^-6}{1250}\)
we have E = \(864NC^-1\)
The production of pure spectrum could easily be achieved using a?
glass prism with a pin
triangular prism with two convex lens
traingular prism only
triangular prism with two concave lenses
Correct answer is B
No explanation has been provided for this answer.
Simple microscope
refecting lens
compound microscope
projector
Correct answer is A
No explanation has been provided for this answer.
4.5 x 10-11s
4.5 x 10-10s
4.5 x 10-12 s
3.0 x 10-10s
Correct answer is A
N = 1.5 = (speed of light in glass)/speed of light in air
(1.5)/1 = (3.0 x 108)/V
V = (3.0 x 108)/1.5
V = 2.0 x 108 ms-1
But x = Vt
t = (x)/Vt
t = (x)/v = \( \frac{9 x 10^{-3}}{2.0 x 10^8}\)
∴ Time = 4.5 x 10\(^{-11}\)S
The instrument used by designers to obtain different color pattern is called?
periscop
sextant
episcope
kaleidoscope
Correct answer is D
No explanation has been provided for this answer.