Answer:
20. This is a transverse wave.
21. a is a Crest
b is the wavelength
c is the amplitude
d is the trough
e isthe amplitude
f is the wavelength
g is time
Explanation:
Answer:
Explanation:
In case of oil slick a thin layer of oil is formed on water . This thin layer creates a rainbow of colour . The phenomenon is due to interference of light waves , one reflected from the upper surface of oil and the other reflected from the lower surface of the oil.
For formation of bright colour
2 μ t = ( 2n + 1 ) λ / 2
μ is refractive index of oil , t is thickness of oil layer λ is wave length of light falling on the layer .
given μ = 1.2 , λ = 750 x 10⁻⁹ ,
2 x 1.2 t = ( 2n + 1 ) 750 x 10⁻⁹ / 2
For minimum thickness n = 0
2.4 t = 375 x 10⁻⁹
t = 156.25 n m
B ) If the refractive index of layer of medium below oil is less than that of oil , the condition of formation of colour changes
The new condition is
2 μ t = n λ
2 x 1.5 t = 750 nm , n = 1 for minimum wavelength .
t = 250 nm
C ) Light mostly transmitted means dark spot is formed at that point .
For that to be observed from water side , the condition is
2 μ t = ( 2n + 1 ) λ / 2
λ = 4μ t / ( 2n + 1 )
For maximum wavelength n = 0
λ = 4μ t
= 4 x 1.5 x 200 nm
= 1200 nm .
Bernini's sculpture "Apollo and Daphne" implies a chase scene motion. Apollo and Daphne<span> is a life-sized Baroque marble </span>sculpture<span> by Italian artist Gian Lorenzo </span>Bernini<span>, executed between 1622 and 1625. Hope this answers the question. Have a nice day.</span>
Answer:
Approximately .
Explanation:
Make use of the fact that total momentum is conserved in collisions.
The momentum of an object of mass and velocity is .
The momentum of the two trolleys before the collision would be:
- .
- .
Thus, the total momentum of the two trolleys right before the collision would be .
Since the two trolleys are stuck to one another after the collision, they could modelled as one big trolley of mass .
The momentum of the two trolleys, combined, is conserved during the collision. Thus, the total momentum of the new trolley of mass would continue to be shortly after the collision.
Rearrange the equation to find the velocity of the two trolleys combined:
.