Answer:
b = 2.22 cm
Explanation:
The laser hits a point where the origin of the coordinate system is to carry out the measurements. When the ray enters the glass the angle of refraction is given by the equation
n₁ sin θ₁ = n₂ sin θ₂
where n₁ is the index of refraction of air n₁ = 1 and n₂ is the index of refraction of glass n₂ = 1.6
sin θ₂ = n₁ /n₂ sin θ₁
sin θ₂ = 1 / 1.6 sin 36
sin θ₂ = 0.367
θ₂ = sin⁻¹ 0.367
θ₂ = 21.6º
with this angle and trigonometry we can find the distance x that the ray advances before reaching the bottom of the glass plate
tan 21.6 = x / d
where d is the thickness of the glass d = 2.8 cm
x = d tan 21.6
x = 2.8 tan 21.6
x = 1.11 cm
as in the second surface it has a process of reflection the angle of reflection is equal to the angle of incidence θ_reflected = 21.6º, therefore to return to the upper surface recreate the same distance, therefore the total distance is
b = 2x
b = 2 1.11
b = 2.22 cm
Answers:
a) 222.22 m/s
b) 800.00 km/h
Explanation:
The speed of a wave is given by the following equation:
Where:
is the speed
is the frequency, which has an inverse relation with the period 
is the wavelength
Solving with the given units:
This is the speed of the wave in km/h
Transforming this speed to m/s:
This is the speed of the wave in m/s
Answer:
1 : 2 cm/km or 
One cm represents 2 km.
Explanation:
If 3 cm represents 6 km on the earth, the ratio to consider is: 3 : 6 cm/km which is the same as:
1 : 2 cm/km or
One cm represents 2 km.
Frequency decreases whilst wavelength increases and the opposite also occurs
