Friction pushes her hands!!
Answer:
8.33 minutes
Explanation:
First let us find out how much time it takes for the light for the sun to reach the earth
Distance between Earth and Sun is 1.5×10¹¹ m
Speed of light = 3×10⁸ m/s

Converting to minutes

So, it takes 8.33 minutes for the light from the sun to reach Earth.
This means that we would be receiving light for 8.33 minutes after the Sun turned off.
The distance between two consecutive points in a wave is called the wavelength.
Answer:
phase difference = π / 2
constructive interference
Explanation:
Given data
wavelength = 420 nm
1st beam = 105 nm
path difference = 105 nm
to find out
phase difference and interference pattern of the two beams
solution
we use here equation of phase difference that is
phase difference = 2π / wavelength × Δx
put here value
phase difference = 2π / 420 × 105
phase difference = π / 2
and
we know that here path difference Δx is the integral multiple of the wavelength so it will be constructive interference
Δx is wavelength / 4