12 Questions
What is one property of X-rays?
X-rays have high penetrating power.
Define Compton effect.
Compton effect is the increase in wavelength of X-rays when they collide with electrons.
State Wien’s displacement law.
Wien’s displacement law states that the wavelength of the peak intensity of blackbody radiation is inversely proportional to its temperature.
Which material is used in Ferry’s black body?
Platinum.
State de Broglie hypothesis.
de Broglie hypothesis states that particles, such as electrons, exhibit wave-like properties.
Define r.m.s. value of current.
The root mean square (r.m.s.) value of current is the effective value of an alternating current.
What is Rayleigh-Jean's law?
Rayleigh-Jean's law describes the spectral radiance of electromagnetic radiation emitted by a black body as a function of wavelength at different temperatures.
What is series resonance and derive an expression for resonant frequency?
Series resonance occurs when the inductive reactance and capacitive reactance in an AC circuit cancel each other out, leading to maximum current flow. The resonant frequency in series resonance is given by $f = \frac{1}{2\pi\sqrt{LC}}$.
Explain how current lags behind the applied voltage in a series LR circuit and draw a relevant phasor diagram.
In a series LR circuit, the current lags behind the applied voltage due to the inductive nature of the circuit. The phasor diagram shows the current phasor lagging behind the voltage phasor by 90 degrees.
Why is the average value of Alternating current over one complete cycle zero?
The average value of Alternating current over one complete cycle is zero because the current alternates in direction and spends an equal amount of time above and below the zero line.
How is the bandwidth related to the sharpness of a resonance curve?
The bandwidth is inversely related to the sharpness of a resonance curve. A narrower bandwidth corresponds to a sharper resonance peak.
Calculate the peak current and the r.m.s current for an AC source V = 5 sin (100πt) connected across a capacitor of capacitance 0.25 µF.
The peak current is 5 A and the r.m.s current is approximately 3.54 A.
Test your knowledge on X-rays properties, Compton effect, Wien’s displacement law, Ferry’s black body, de Broglie hypothesis, r.m.s. value of current, Daune-Hunt law, admittance, impedance, and formulas for LR and CR circuits.
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