Answer:
123.18 nm
Explanation:
Given:
- Refractive index of the glass=1.5
- Index of magnesium fluoride=1.38
- Wavelength of the light =680 nm
Let t be the thickness of the film. The relation between the wavelength of light in film and thickness of the film in order to have no reflection is given by
Now According to question we have
where n is the refractive index of the film.
Now thickness t is given by
Hence the thickness of the film is calculated in order to have no reflection.
Answer: The answer is D. KNO3
Explanation:
The graph shows that the KN03 going straight up from the temperature sign so you reversed that so that it will make it to 90°C to 30°C
Multiplied by; speed = distance x time
Answer:
clockwise from the south.
Explanation:
Given:
- velocity of the plane southwards,
- velocity of the wind in south-west,
- ∴Angle between the plane and wind velocities,
<u>According to the vector addition rule, magnitude of the resultant velocity is given as:</u>
is the plane's speed with respect to ground.
Direction of this resultant with respect to south:
clockwise from the south.
Answer: B
R = 2 ohms
Explanation:
When resistors are connected in parallel, the equivalent resistance R will be less than the least resistance.
1/R = 1/R1 + 1/R2 + 1/R3 + 1/R4 + 1/R5
Since the 5 resistors are 10 ohms each, substitute them in to the formula
1/R = 1/10 + 1/10 +1/10 + 1/10 + 1/10
The LCM = 10
1/R = 5/10
Reciprocate both sides
R = 10/5 = 2 ohms
The correct option is B