Answer:
The student which is correct is Anya
Explanation:
The wavelength of a wave is the length of one complete wave cycle and it is represented by Greek letter lambda (λ)
The frequency of a wave is the number of waves (complete wave cycles) passing a given point over a given time period and the frequency is represented by the Greek letter nu (ν) and also as "f" (which is the first letter of the word "frequency")
Therefore, the speed, "v", (different from nu (ν)) of the wave is given as follows;
v = f × λ
From which we have;
λ = v/f
∴ λ ∝ 1/f
Which indicates an inversely proportional relationship between the wavelength and the frequenct
From which we have that as the wavelength decreases, the frequency increases
Therefore, Anya decrease increase is correct
Answer:
θ=π/2
Explanation:
The definition of work is W = → F ⋅ → d = q E c o s θ d W=F→⋅d→=qEcosθd. So if no work is done, the displacement must be in the direction perpendicular to the force ie c o s θ = 0 → θ = π / 2 cosθ=0→θ=π/2
We cannot say how much exactly as we don't know the efficiency of the fridge. What we can say however it's definitely less than 441 J, as no device has 100% efficiency. This is the reason why it does not make sense to use fridge to cool down the air if there's no no aircon, as it will generate more heat than it deducts, so it will actually heat up the room even more.
Answer:
89.75 J
Explanation:
The motor uses 90.00 J of electrical energy. Any of that energy that isn't used to do work is converted to heat.
The amount of work done is:
W = mgh
W = (0.2549 kg) (9.81 m/s²) (0.1000 m)
W = 0.2501 J
So the heat generated is:
Q = 90.00 J − 0.2501 J
Q = 89.75 J
Gas is the blank because its burning so it makes it