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Yogita Ingle 6 years, 2 months ago
The intensity of an electromagnetic wave refers to the power per area a wave would impart should it be incident on a surface. The intensity is determined by the strength of the magnetic and electric fields remember:
The amount of radiation emitted from a body increases exponentially with a linear rise in temperature
The average wavelength of electromagnetic emissions becomes shorter with increasing temperature
But the amount of radiation passing through a specific area i.e intensity is inversely proportional to the square of the distance of that area from the energy source
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Yogita Ingle 6 years, 2 months ago
Electric charges can exists as monopole or positive or negative charges exists independently thus the lines originate from the charges and eventually fades at infinity.
Electric field lines flow from positive to negative charge thus never come back to the positive charge. Therefore they do not form a closed loop. This can be considered as a straight one way road.Whereas magnetic lines form closed loops because they come back at the same pole from which they originate.
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Yogita Ingle 6 years, 2 months ago
LCR circuit consists of inductor having inductance = L, a capacitor having capacitance = C and a resistor having resistance = R.
As resistor, capacitor and inductor all are connected in series therefore same amount of current will flow through each of them.
Considering source voltage V = Vm sinωt
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Yogita Ingle 6 years, 2 months ago
Radioactive decay constant (λ) is the reciprocal of time during which the number of atoms in the radioactive substance reduced to 36.8% of the original number of atoms in it.
(i) Y-rays are similar to X-rays
(ii) Penetration power of α-ray is less then that of β and Y -rays so Y-rays are easily absorbed by matter.
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