Answer:
The correct answer is:
(a)
(b)
Explanation:
The given values are:
Power of Laser beam,
= 10 mW
on converting it, we get
=
=
Spot's diameter,
= 0.62 μm
=
Now,
(a)
The intensity of light will be:
⇒
or,
⇒
On substituting the values, we get
⇒
⇒
(b)
The amplitude of electric field will be:
⇒
or,
⇒
On substituting the values, we get
⇒
⇒
Answer: 1.58Ω
Explanation:
R1 = 5Ω
R2 = 15Ω
R3 = 3Ω
R4 = 30Ω
The equivalent resistance of the resistor connection (Rtotal) of the four resistors connected in parallel is obtained by adding the reciprocal of each resistance.
i.e 1/Rtotal = (1/R1 + 1/R2 + 1/R3 +1/R4)
1/Rtotal = (1/5Ω + 1/15Ω + 1/3Ω + 1/30Ω)
Make 30Ω the lowest common multiple
1/Rtotal = (6 + 2 + 10 + 1)/30Ω
1/Rtotal = 19/30Ω
To get the value of Rtotal, cross multiply
1 x 30Ω = Rtotal x 19
30Ω = Rtotal x 19
Rtotal = 30Ω/19
Rtotal = 1.58Ω
Thus, the equivalent resistance of this resistor connection is 1.58Ω
Answer: the focal length of the CCl4-glass combination is 102.31 cm
Explanation:
Given that;
Index of refraction n1 = 1.55
carbon tetrachloride (CCl4), which has n2 = 1.46
radii of curvature for its surfaces R1 = 4.6cm and R2 = 9.20 cm
the focal length of the CCl4-glass combination = ?
we can determine the focal length using the Formula;
1/f = ( n1 - n2) ( 1/R1 - 1/R)
so we substitute in our values
1/f = ( 1.55 - 1.46 ( 1/4.6 - 1/9.20)
1/f = 0.09 × 0.1086
1/f = 0.009774
f = 1 / 0.009774
f = 102.31 cm
Therefore the focal length of the CCl4-glass combination is 102.31 cm
E=energy=5.09x10^5J = 509KJ
<span>M=mass=2250g=2.25Kg </span>
<span>C=specific heat capacity of water= 4.18KJ/Kg </span>
<span>ΔT= change in temp= ? </span>
<span>E=mcΔT </span>
<span>509=(2.25)x(4.18)xΔT </span>
<span>509=9.405ΔT </span>
<span>ΔT=509/9.405=54.1degrees </span>
<span>Initial temp = 100-54 = 46 degrees </span>
<span>Hope this helps :)</span>
v = u + at
25 = 0 + a(14)
a(14) = 25
a = 25/14
a = 1.71 (3sf)
explanation:
u use the equation of motions
v = u + at
v is final velocity, aka 25
u is initial velocity, which is 0 as it was initially at rest
t is time, which is 14s
then u sub in the values and calculate a