Explanation:
It is given that,
The wavelength of red helium–neon laser light in air is,
(a) Frequency,
(b) Let shows its wavelength in glass that has an index of refraction of 1.51,
(c) Let is its speed in the glass.
Hence, this is the required solution.
Answer:
Wave interference is the phenomenon that occurs when two waves meet while traveling along the same medium.
Explanation:
A radioactive isotope will release alpha particles and become more stable, and becomes a different element.
I am crossed between A and D but i think A is the correct one.
Answer:
θ = 26.6°
Explanation:
Formula for maximum height is;
h = u²sin²θ/2g
We are told maximum height is 25 m, thus;
u²sin²θ/2g = 25 - - - - (eq 1)
Formula for horizontal range is;
R = u²sin2θ/g
In Mathematics, sin2θ = 2sinθcosθ
So; R = 2u²sinθcosθ/g
R = 2u²sinθcosθ/g
We are given Horizontal range = 200 m.
Thus;
2u²sinθcosθ/g = 200 - - - - (eq 2)
Divide eq 1 by eq 2 to get;
200/25 = 4cosθ/sinθ
8 = 4cosθ/sinθ
4/8 = sinθ/cosθ
0.5 = tan θ
θ = tan^(-1) 0.5
θ = 26.6°