The amount of heat required is B) 150 J
Explanation:
The amount of heat energy required to increase the temperature of a substance is given by the equation:
where:
m is the mass of the substance
C is the specific heat capacity of the substance
is the change in temperature of the substance
For the sample of copper in this problem, we have:
m = 25 g (mass)
C = 0.39 J/gºC (specific heat capacity of copper)
(change in temperature)
Substituting, we find:
So, the closest answer is B) 150 J.
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Answer:
Explanation:
From the attached file diagram, the total force acting on the charged box is the downward weight and the repulsive force acting in opposite to the weight force . Hence we can write the total force as
When fixed,F=o
Hence
The value of the acceleration is 16.2m/s^2
Answer:
The potential difference through which an electron accelerates to produce x rays is .
Explanation:
It is given that,
Wavelength of the x -rays,
The energy of the x- rays is given by :
The energy of an electron in terms of potential difference is given by :
So,
V is the potential difference
e is the charge on electron
V = 12431.25 volts
or
So, the potential difference through which an electron accelerates to produce x rays is . hence, this is the required solution.
Answer Part A: radiation
Part B: conduction
Part C: conduction
Part D: conduction
Part E: conduction
Part F: radiation
Part G::radiation
Part H : convection
Explanation:conduction is heat transfer through direct contact
Convection is through molecules or particles of water or air current
Radiation is heat transfer through empty space .
Answer:
The answer is explained below.
Explanation:
The energy emitted during the de-excitation of an electron from a higher energy level to a lower energy level is directly proportional to the frequency of the emitted light.
Here, the total sum of the energies of 2 frequencies of light emitted in different stages is equal to the energy of a single frequency of light during the de-excitation of fourth level to ground level directly.
Hence the total sum of of the frequencies of 2 lights emitted in different stages is equal to the frequency of single frequency of light emitted during the de-excitation from fourth level to ground level directly.
The some of the energies of 2 frequencies emitted by one electron is equal to the energy of a single frequency when electron jumps directly.