Answer:
Melting tin and then cooling it into a mold
Explanation:
When you melt something, and when it cools it returns to its physical state, therefore the physical changes are reversible. For example, take chocolate. When chocolate melts its liquid, then when it's in a colder situation it becomes solid again and so on, the changes are reversible.
Snapping a leaf shut around an insect, I think.
<span>The majority of the asteroids in our solar system are found
in the space between the orbits of Mars and Jupiter. (B)</span>
Answer
given,
number of crest (N)= 5
time(t) = 50 s
distance between to successive crest = 32 m
a) Period
b) frequency
c) wavelength
distance between to consecutive crest is wavelength
wavelength = 32 m
d) speed
v = f λ
v = 0.1 x 32
v = 3.2 m/s
e) Amplitude
We cannot determine amplitude because data is not given.
Answer:
a) The width of the central bright fringe is 1.41492×10^-2 m
b) The width of the first bright field on either side of the bright fringe is 7.075×10^-3 m
Explanation:
Let d be the width of the slit, s be the screen distance, m the order of diffraction. And x be the distance from the center to the edge of the central bright fringe and W be the width of the central bright fringe . And let y be the distance from the center of the central bright fringe to the edge of the first bright fringe on either side of the central bright fringe and w be the width of the first bright fringe. Let θ1 and θ2 respectively be the scattering angles of the central bright fringe and the first bright fringe.
a) According to Bragg's law
d×sinθ1 = m×λ
(0.340×10^-3)×sinθ1 = 1×(633×10^-9)
θ1 = 10.667×10^-2°
x = s×tanθ1
x = 3.80×tan(10.667×10^-2°)
x = 7.0741×10^-3 m
Now to get the width of the fringe you need to add x and x together
W = 2×x
W = 2×7.0741×10^-3
W= 1.41492×10^-2 m
b) For the second bright fringe
d×sinθ2 = m×λ
3.8×sinθ2 = 2×(633×10^-9)
θ2 = 21.33×10^-2°
y = s×tanθ2
y = 3.80×tan( 21.33×10^-2°)
y = 1.4149×10^-2 m
The width of the first bright fringe on either side of the central bright fringe is given by:
w = y - x
w = 7.075×10^-3 m
