Im not 100% sure you have to tell me if im wrong or not.
D
B
C
Answer:
Sound waves are reflected back
Answer:
cm
Explanation:
= separation between the slits = 2783 x 10⁻⁹ m
= wavelength of coherent light = 644 nm = 644 x 10⁻⁹ m
= Distance of the screen = 6 cm = 0.06 m
= Position of nth bright fringe
Position of nth bright fringe is given as
for n = 2
![y_{2} = \frac{(2)(0.06)(644\times10^{-9}))}{2783\times10^{-9}}](https://tex.z-dn.net/?f=y_%7B2%7D%20%3D%20%5Cfrac%7B%282%29%280.06%29%28644%5Ctimes10%5E%7B-9%7D%29%29%7D%7B2783%5Ctimes10%5E%7B-9%7D%7D)
m
for n = 4
![y_{4} = \frac{(4)(0.06)(644\times10^{-9}))}{2783\times10^{-9}}](https://tex.z-dn.net/?f=y_%7B4%7D%20%3D%20%5Cfrac%7B%284%29%280.06%29%28644%5Ctimes10%5E%7B-9%7D%29%29%7D%7B2783%5Ctimes10%5E%7B-9%7D%7D)
m
Distance between 4th and 2nd bright fringes is given as
![w = y_{4} - y_{2} = 0.0555 - 0.0278 = 0.0277 m](https://tex.z-dn.net/?f=w%20%3D%20y_%7B4%7D%20-%20y_%7B2%7D%20%3D%200.0555%20-%200.0278%20%3D%200.0277%20m)
cm
1) According to the law of conservation of momentum ..
<span>Horiz recoil mom of gun (M x v) = horiz. mon acquired by shell (m x Vh) </span>
<span>1.22^6kg x 5.0 m/s = 7502kg x Vh </span>
<span>Vh = 1.22^6 x 5 / 7502 .. .. Vh = 813 m/s </span>
<span>Barrel velocity V .. .. cos20 = Vh / V .. ..V = 813 /cos20 .. .. ►V = 865 m/s </span>
<span>2) Using the standard range equation .. R = u² sin2θ /g </span>
<span>R = 865² x sin40 / 9.80 .. .. ►R = 49077 m .. (49 km)</span>