Answer:
the radio can tune wavelengths between 1.88 and 5.97 m
Explanation:
The signal that can be received is the one that is in resonance as the impedance of the LC circuit.
X = X_c - X_L
X = 1 / wC - w L
at the point of resonance the two impedance are equal so their sum is zero
X_c = X_L
1 / wC = w L
w² = 1 / CL
w = 
let's look for the extreme values
C = 1 10⁻¹² F
w = 
w = 
w = 10⁹ rad / s
C = 10 10⁻¹² F
w = 
Ra 1/10 10-12 1 10-6
w = 
Ra 0.1 1018
w = 0.316 10⁹ rad / s
Now the angular velocity and the frequency are related
w = 2π f
f = w / 2π
the light velocity is
c = λ f
λ = c / f
we substitute
λ = c 2π/w
we calculate the two values
C = 1 pF
λ₁ = 3 10⁸ 2π / 10⁹
λ₁= 18.849 10⁻¹ m
λ₁ = 1.88 m
C = 10 pF
λ₂ = 3 10⁸ 2π / 0.316 10⁹
λ₂ = 59.65 10⁻¹ m
λ₂ = 5.97 m
so the radio can tune wavelengths between 1.88 and 5.97 m
Atoms consist of protons, neutrons and electrons
Explanation:
There are three particles in an atom:
- Proton: it is located in the nucleus. Its mass is
, and it is positively charged (its electric charge is 
, also called fundamental charge) - Neutron: it is also located in the nucleus. Its mass is slightly larger than the proton (
), and it has no electric charge. Protons and neutrons are held together inside the nucleus by the strong nuclear interaction - Electron: it is located outside the nucleus, in a region called "electron cloud". According to quantum mechanics, its exact position cannot be determined, but it can only be described by a "wave function" which gives the probability of finding the electron at a certain position. Its mass is much smaller than the proton (
) and it is negatively charged (its charge is the opposite of that of the proton: 
).
Learn more about atoms:
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Conduction and convection both require some material substance
to move heat from one place to another, and there's none of that
between the sun and Earth.
The only way for thermal energy to move from place to place with
nothing in between is by the process of radiation, and that's how
it gets here from the sun.
<h2>
Answer: in full phase</h2>
Explanation:
Galileo observed that Venus presented phases (such as those of the moon) together with a variation in size; observations that are only compatible with the fact that <u>Venus rotates around the Sun and not around Earth. </u>
This is because Venus presented <u>its smaller size when it was in full phase and the largest size when it was in the new one</u>, when it is between the Sun and the Earth.
In other words: When Venus is in its full phase it is not possible to observe it from the Earth because always in this phase, Venus, the Sun and the Earth are in conjunction (or aligned). This means <u>the Sun is between Venus and Earth</u>, in the orbit that both planets describe around this star.
Therefore, from the Earth, the Sun covers Venus.
This fact along with other discoveries were presented by Galileo to the Catholic Church (which supported the geocentric theory at that time) as a proof that completely refuted Ptolemy's geocentric system and affirmed Copernicus' heliocentric theory.
