Answer: B
G v = 60 cm/s λ = 15 cm E f = V / λ S f = 4 Hz U f = ? S f = (60 cm/s) / 15 cm 5.
Explanation:
Answer:
240 nm
Explanation:
In the interference in thin films , light reflected from upper surface and light reflected from the lower surface of oil are made to interfere each other to form fringes due to path difference of 2μt .
a ) An additional phase shift of 180 ° occurs on the upper surface because light is going from optically rarer medium to denser medium .
b ) There is no such change on reflection from lower surface as light is going from denser to rarer medium ( air ).
c ) For destructive interference the path difference which is equal to 2 μ t should be equal to n λ where n is any number
So for given condition
2 μ t = n λ
For minimum thickness
2 μ t = λ ( n =1 )
t = λ / 2μ
= 600 x 10⁻⁹ /( 2 x 1.25 )
= 240 nm
Answer:
Explanation:
A ) At constant volume :
ΔEint = n Cv x ΔT , n is no of moles , Cv is specific heat at constant volume , ΔT is increase in temperature .
For helium Cv = 3/2 R = 1.5 x 8.3 J = 12.45 J
ΔEint = .7 x 12.45 x ( 564 - 300 )
= 2300.76 J .
W₁ = 0 because volume is constant so work done by gas is zero .
Q₁ = ΔEint = 2300.76 J
B )
At constant pressure
Q₂ = n Cp Δ T , Cp is specific heat at constant pressure .
For monoatomic gas ,
Cp = 5/2 R = 2.5 x 8.3 J = 20.75 J
Q₂ = .7 x 20.75 x 264 J
= 3834.6 J
W₂ = work done by gas
= PΔV = nRΔT
= .8 x 8.3 x 264
= 1752.96 J
ΔEint = Q₂ - W₂
= 3834.6 - 1752.96
= 2081.64 J.
Depends on how steep the roof is , maybe the egg will just stay where it is but if the roof is more to the left it will fall to the left and same goes for right !
The answer is: A. The magnetic field of a bar magnet