Answer:
It is the angle of refraction in glass for which the angle of incidence in air is 90°.
Explanation:
When light is refracted, the sine of the angle changes in proportion to the refractive index. When the light is 90 degrees, the sine is zero, and zero is still zero on the other side. So nothing changes.
Answer:
4.71m/s
Explanation:
Given parameters:
Distance covered = 40.5m
Time taken = 8.6s
Unknown:
Speed = ?
Solution:
The speed of Samantha is the distance divided by the time taken.
Speed =
Now insert the parameters;
Speed = = 4.71m/s
E = hf
E = 6.63* 10 ⁻³⁴ * 7.24* 10¹⁴
<span>E = 4.80012 × 10⁻¹⁹ J</span>
I think the first question is talking about the ionic compound Sodium sulfide and it’s formula is Na2S.
And for the second question, i’m pretty sure it’d be a positive charge
The correct answer should be 2.6 billion years (if i am correct)