Ans:
a = 9i + 12j
b = 3i + 4j
Explanation:
We have two equations:
<span>a - b = 2c --- (A)
</span><span>a + b = 4c --- (B)
and two unknowns:
a = ?
b = ?
Whereas,
c = 3i + 4j
Add equations (A) and (B):
=> a - b = 2c
a + b = 4c
----------------------
2a = 6c
=> a = 3c --- (C)
Put the value of vector c in equation (C):
(C) => a = 3(3i + 4j)
=> a = 9i + 12j
Now that we have vector a, put that vector and vector c in equation (A):
(A)=> (9i + 12j) - b = 2(3i + 4j)
=> b = (9i + 12) - (6i + 8j)
=> b = 3i + 4j
Ans:
a = </span>9i + 12j
b = 3i + 4j<span>
</span>
Answer:
The reason we can't feel it is that the air within our bodies (in our lungs and stomachs, for example) is exerting the same pressure outwards, so there's no pressure difference and no need for us to exert any effort.
Answer:
a) 298.5 nm
, 522.4 nm and b) radiation frequency does not change
Explanation:
When electromagnetic radiation reaches a medium with a different index of refraction, the medium vibrates the molecules, as if it were a resonance process, whereby the medium vibrates at the same frequency as the incident light.
On the other hand, when the light reaches another medium its average speed within the medium changes, it is now less than the speed of light in a vacuum (c) for this to happen as we saw that the frequency is constant there must be a change in the wavelength of the radiation that is characterized by the ratio
λₙ = λ₀ / n
λₙ = 400 nm in the void
λₙ = 400 / 1.34
λₙ= 298.5 nm
λ₀ = 700 nm
λₙ = 700 / 1.34
λₙ = 522.4 nm
The radiation frequency does not change
