Given: Wavelength λ = 686 nm convert to meter λ = 6.86 x 10⁻⁷ m
Velocity of light c = 3.00 x 10⁸ m/s
Required: Frequency f = ?
Formula: f = c/λ
f = (3.00 x 10⁸ m/s)/(6.86 x 10⁻⁷ m)
f = 4.37 x 10¹⁴ Hz or
f = 437 Terahertz
When a ray of light strikes a plane mirror the light of the ray it reflects off from the mirror. reflection is a change in direction from the light ray.
Answer:
a) ΔФ = 5.54 rad
, b) f = 140 Hz
Explanation:
a) This is a sound interference exercise, which is described by
Δr /λ = ΔФ / 2π
ΔФ = Δr 2π /λ
Let's find the path difference
Δr = r₂ -r₁
r₁ = 4m
r₂ = √ (x² + y²) = √(3² + 4²) = 5 m
Δr = 1 m
To find the wavelength we use the relation of the speed of sound
v = λ f
λ = v / f
λ = 340/300
λ = 1,133 m
We substitute
ΔФ = 2π 1 /1.133
ΔФ = 5.54 rad
b) to have a minimum intensity the phase difference must be π radians
λ = Δr 2π /Ф
λ = 1 2π /π
λ = 2m
We look for the frequency
v = λ f
f = v /λ
f = 340/2
f = 140 Hz
Answer:
24mph
Explanation:
it really depends how high but the average speed for that quick will be atleast 24mph if not try 42mph if it is wrong