The change in the internal energy of the gas during the process is 25 J.
Explanation:
In an adiabatic process, no heat is gained or lost by the system. According to the first law of thermodynamics,
Q= dU + dW
Here, Q is heat gained or lost by the system,
dU is the change in the internal energy of the system,
dW is the work done,
As the process is adiabatic, Q=0 we get,
dU= ₋ dW = ₋ 25 J
The negative sign shows that there is a decrease in the temperature of the system.
The energy of a single photon is given by
where
is the Planck constant
f is the frequency of the wave (of the photon)
In our problem, the radio wave has a frequency of
, so if we put this value into the previous formula, we can find the energy of a single photon of this electromagnetic wave:
C. Is the correct answer for this question
Answer:
The correct option is b) By the time they get to be theories, they cannot be disproven. It's not necessary that the theories are always right. They can be proven wrong.
Explanation:
Answer:
c) All choices listed are definitely true.
Explanation:
a)
- As they are connected in parallel, the voltage drop is equal in all the resistors, by definition of a parallel connection, and equal to the terminal voltage of the battery (assuming that the internal resistance of the battery is negligible).
b)
- Applying Ohm's law to the circuit, we arrive to the following expression:
- Simplifying common terms, we have:
- It can be seen that the equivalent resistance, is less than any of the resistances.
d)
- Due to the charge conservation principle, as the current is made from moving charges, the sum of the currents passing through these resistors is equal to the current passing through the battery (KCL).