49.1 Thermal RadiationsThe radiations emitted by a body due to its temperature are called
thermal radiations.
All bodies not only emit the thermal radiations, but also absorb these
radiations from surroundings. If the rate of emission of radiation is
equal to the rate of absorption for a body, then the body is said to be
in thermal equilibrium.
The...
Exercise Short Questions of Electromagnetic Induction, Chapter 15 of 2nd Year Physics
May 03, 2023
2nd Year Physics, Electromagnetic Induction, Exercise Short Questions
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EXERCISE SHORT QUESTIONS
CHAPTER # 15: ELECTROMAGNETIC INDUCTION
Q # 1. Does the inducted emf in circuit depend on the resistance
of the circuit? Does the induced current depend on the resistance of the circuit?
Ans. The
expression for induced emf is given by
\[\mathbf{\varepsilon = -
N}\frac{\mathbf{\mathrm{\Delta}\phi}}{\mathbf{\mathrm{\Delta}t}}\]
The...
Exercise Short Questions of Physics of Solids, Chapter 17 of 2nd Year Physics
May 03, 2023
2nd Year Physics, Exercise Short Questions, Physics of Solids
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EXERCISE SHORT QUESTIONS
CHAPTER # 17: PHYSICS OF SOLIDS
Q # 1. Distinguish between crystalline, amorphous and
polymeric solids.
Ans.
Crystalline Solids: The
solids in which the atoms, ions and molecules are arranged periodically are
called crystalline solids. Metals such as copper, zinc, iron etc., Ionic
compounds such as sodium chloride and...
Exercise Short Questions of Electronics, Chapter 18 of 2nd Year Physics
May 03, 2023
2nd Year Physics, Electronics, Exercise Short Questions
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EXERCISE SHORT QUESTIONS
CHAPTER # 18: ELECTRONICS
Q # 1: How does the motion of an electron in n-type
substance differ from the motion in a p-type substance?
Ans. In n-type
material, the electrons are the majority carriers. They move from lower
potential to higher potential.
In p-type materials, the holes are the majority carriers.
They...
Exercise Short Questions of Dawn of Modern Physics, Chapter 19 of 2nd Year Physics
May 03, 2023
2nd Year Physics, Exercise Short Questions, Modern Physics
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EXERCISE SHORT QUESTIONS
CHAPTER # 19: DAWN OF MODERN PHYSICS
Q # 1. What are the measurements on which two observers in relative
motion will always agree upon?
Ans. The measurement on which two observers in
relative motion will always agree upon is speed of light.
Q # 2. Does the dilation means that time really passes more slowing
in moving...
Exercise Short Questions of Nuclear Physics, Chapter 21 of 2nd Year Physics
May 02, 2023
2nd Year Physics, Exercise Short Questions, Nuclear Physics
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EXERCISE SHORT QUESTIONS
CHAPTER # 21: NUCLEAR PHYSICS
Q # 1: What are
isotopes? What do they have in common and what are their differences?
Ans. Isotopes are those nuclei, which have same
atomic number but have different mass number. The isotopes have the same number
of protons and have different number of neutrons.
Q # 2: Why are
heavy...
Exercise Short Questions of Atomic Spectra, Chapter 20 of 2nd Year Physics
May 02, 2023
2nd Year Physics, Atomic Spectra, Exercise Short Questions
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EXERCISE SHORT
QUESTIONS
CHAPTER # 20: ATOMIC
SPECTRA
Q # 1. Bohr's theory of hydrogen atom is based upon several assumptions.
Do any of these assumptions contradict classical physics?
Ans. Bohr's first postulate disagrees with the
classical physics. According to this postulate:
An electron in an orbit revolving around the nucleus...
Exercise Short Questions of Alternating Current, Chapter 16 of 2nd Year Physics
May 02, 2023
2nd Year Physics, Alternating Current, Exercise Short Questions
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EXERCISE SHORT QUESTIONSCHAPTER # 16: ALTERNATING CURRENT
Q # 1. A
sinusoidal current has rms value of 10 A. What is the maximum or peak value?
Ans.
GivenThe RMS value of current is 10 A.
\[Peak\ Value\ (maximum\ value) = I_{0} = \ ?\]
Using formula:
\[I_{rms} = \frac{I_{0}}{\sqrt{2}}\]
\[\Longrightarrow {I_{0} = \sqrt{2\ }\ \ I}_{rms}\]
\[\Longrightarrow...