Answer:
Conservation of momentum.
Momentum is zero after collision, no direction or speed.
Explanation:
A bees wings move so rapidly that studying them, even seeing them, has proved difficult.
The honeybees have a rapid wing beat honeybee flaps its wings 230 times every second.
Therefore, a bee flaps its wings over 200 times in about 1ms
Force=mass*acceleration. So 88kg*10 m/s^2=880 newtons
Answer:
option A
Explanation:
When white light is incident on prism it bends and dispersed into different colors.
According to Cauchy equation, refractive index is inversely proportional to the wavelength of the light.
wavelength of the light in decreasing order
orange > yellow > green > blue
wavelength of the orange light is the highest.
Hence, the refractive index of orange will be lowest.
The correct answer is option A
Answer:
Explanation:
The problem is based on interference in thin films
refractive index of water is more than given oil so there will be phase change of π at upper and lower layer of the film .
a )
for constructive interference , the condition is
2μt = nλ where t is thickness of layer , μ is refractive index , λ is wavelength and n is order of the fringe
Putting the values
2 x 1.27 t = n x 640
2 x 1.27 t = 640 ( for minimum thickness n = 1 )
t = 252 nm .
b )
2 x 1.27 t = m₁ λ₁
for destructive interference
2μt = (2m₂+1)λ₂/2
2 x 1.27 t =(2m₂+1)λ₂/2
m₁ λ₁ = (2m₂+1)λ₂/2
2m₁λ₁ = (2m₂+1)λ₂
2m₁ / (2m₂+1) = λ₂ / λ₁
2m₁ / (2m₂+1) = 548/ 640
2m₁ / (2m₂+1) = .85625
2m₁ = .85625 (2m₂+1)
This is the required relation between m₁ and m₂
