Group 17 is the second column from the right in the periodic table and contains six elements: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), astatine (As), and (Ts). Astatine and are radioactive elements with very short half-lives and thus do not occur naturally.
Speed of car A is given as
![v_a = 70 mph](https://tex.z-dn.net/?f=v_a%20%3D%2070%20mph)
now we need to convert it into SI units
1 miles = 1609 m
1 hour = 3600 s
now we have
![v_a = 70 *\frac{1609}{3600} = 31.3 m/s](https://tex.z-dn.net/?f=v_a%20%3D%2070%20%2A%5Cfrac%7B1609%7D%7B3600%7D%20%3D%2031.3%20m%2Fs)
now its distance from Bambi is given as
![d_a = 350 m](https://tex.z-dn.net/?f=d_a%20%3D%20350%20m)
time taken by it to hit the Bambi
![t = \frac{d}{v}](https://tex.z-dn.net/?f=t%20%3D%20%5Cfrac%7Bd%7D%7Bv%7D)
![t = \frac{350}{31.3}](https://tex.z-dn.net/?f=t%20%3D%20%5Cfrac%7B350%7D%7B31.3%7D)
![t = 11.2 s](https://tex.z-dn.net/?f=t%20%3D%2011.2%20s)
Now other car is moving at speed 50 mph
so its speed in SI unit will be
![v_b = 50* \frac{1609}{3600}](https://tex.z-dn.net/?f=v_b%20%3D%2050%2A%20%5Cfrac%7B1609%7D%7B3600%7D)
![v_b = 22.35 m/s](https://tex.z-dn.net/?f=v_b%20%3D%2022.35%20m%2Fs)
now its distance from Bambi is given as
![d_b = 590 feet](https://tex.z-dn.net/?f=d_b%20%3D%20590%20feet)
as we know that 1 feet = 0.3048 m
![d_b = 590*0.3048 = 179.83 m](https://tex.z-dn.net/?f=d_b%20%3D%20590%2A0.3048%20%3D%20179.83%20m)
now the time to hit the other car is
![t_2 = \frac{179.83}{22.35}](https://tex.z-dn.net/?f=t_2%20%3D%20%5Cfrac%7B179.83%7D%7B22.35%7D)
![t_b = 8.05 s](https://tex.z-dn.net/?f=t_b%20%3D%208.05%20s)
So Car B will hit the Bambi first
Answer:
Option D
Explanation:
Option (A) is incorrect because transmission of few wavelength will procure visibility of only few colours and not all. Option B is also incorrect as refraction index remains same as it does not changes with the change in angle. Option C is also incorrect because changing orientation of only some of the light with not make any significant difference
Option D is correct because sunlight is a unpolarised light which can be polarised using reflection. Now when sunlight gets partially linearly polarized after reflection from the lake, it can be viewed by the observer's eye through the lens.
Answer:
![q = 0.107 \mu C](https://tex.z-dn.net/?f=q%20%3D%200.107%20%5Cmu%20C)
Explanation:
As we know that net force is given by
![F = ma](https://tex.z-dn.net/?f=F%20%3D%20ma)
here we have
m = 1.00 g = 0.001 kg
also we know that acceleration is given as
![a = 256 m/s^2](https://tex.z-dn.net/?f=a%20%3D%20256%20m%2Fs%5E2)
now force is given as
![F = 0.001(256) = 0.256 N](https://tex.z-dn.net/?f=F%20%3D%200.001%28256%29%20%3D%200.256%20N)
now by the formula of force we know that
![F = \frac{kq_1q_2}{r^2}](https://tex.z-dn.net/?f=F%20%3D%20%5Cfrac%7Bkq_1q_2%7D%7Br%5E2%7D)
![0.256 = \frac{(9\times 10^9)q^2}{(0.02)^2}](https://tex.z-dn.net/?f=0.256%20%3D%20%5Cfrac%7B%289%5Ctimes%2010%5E9%29q%5E2%7D%7B%280.02%29%5E2%7D)
now for solving charge we have
![q = 0.107 \mu C](https://tex.z-dn.net/?f=q%20%3D%200.107%20%5Cmu%20C)