What is the speed of an arrow that takes 1.25 seconds to hit a target 75 meters away?
2 answers:
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Answer:
The minimum thickness of the film and the wavelength of the light in air are and 371 nm.
Explanation:
Given that,
Refractive index of soap= 1.34
Refractive index of glass= 1.55
Wavelength = 642 nm
(I). We need to calculate the minimum thickness
Using formula of thickness
Where, m = 0 for constrictive
Put the value into the formula
(II). We need to calculate the wavelength
Using formula of wavelength
Where, m = 1
Put the value into the formula
Hence, The minimum thickness of the film and the wavelength of the light in air are and 371 nm.
Answer:
a). 1.28333 seconds
b). 186.66 seconds
Explanation:
a). Given :
Distance between the earth and the moon, d = m
Speed of the radio waves, c = m/s
Therefore the time required for the voice of Neil Armstrong to reach the earth via radio waves is given by :
= 1.28333 seconds
b). Distance between Mars and the earth, d = m
Speed of the radio waves, c = m/s
So, the time required for his voice to reach earth is :
= 186.66 seconds