MEDIUM
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How Heinrich Hertz discovered the existence of electromagnetic waves?

Important Questions on Development

EASY
Physics>System>Development>Dual Nature of Light
Name an instrument based upon the wave like behaviour of electrons. Explain.
EASY
Physics>System>Development>Dual Nature of Light
Calculate the de Broglie wavelength of an electron of kinetic energy 100 eV. Given m=9.1×10-31 kg, e=1.6×10-19 C, and h=6.62×10-34 Js.
EASY
Physics>System>Development>Dual Nature of Light
Give the example of a particle which has zero rest mass and zero charge. 
EASY
Physics>System>Development>Dual Nature of Light
The number of photons of frequency v present in energy E is:
EASY
Physics>System>Development>Dual Nature of Light

What is the speed of a photon with respect to another photon if,

(a) the two photons are going in the same direction and

(b) they are going in the opposite direction.

MEDIUM
Physics>System>Development>Dual Nature of Light
Write a note on the nature of light and its role in photosynthesis.
MEDIUM
Physics>System>Development>Dual Nature of Light
The energy associated with light of which of the following colours is minimum:
HARD
Physics>System>Development>Dual Nature of Light
A particle of mass M at rest decays into two particles of masses m1 and m2, having non-zero velocities. The ratio of the de Broglie wavelengths of the particles, λ1λ2 is
HARD
Physics>System>Development>Dual Nature of Light
Can a photon be deflected by an electric field? By a magnetic field?
EASY
Physics>System>Development>Dual Nature of Light
What is the name given to quanta of electromagnetic energy?
EASY
Physics>System>Development>Dual Nature of Light
The idea of the quantum nature of light has emerged in an attempt to explain
HARD
Physics>System>Development>Dual Nature of Light
In an old-fashioned television set, electrons are accelerated through a potential difference of 25.0 kV. What is the de-Broglie wavelength of such electrons? (Relativity is not needed.)
EASY
Physics>System>Development>Dual Nature of Light
As per recent understanding light consists of:
EASY
Physics>System>Development>Dual Nature of Light
Are matter waves electromagnetic? Why?
MEDIUM
Physics>System>Development>Dual Nature of Light

A particle moves in a closed orbit around the origin, due to a force which is directed towards the origin. The de Broglie wavelength of the particle varies cyclically between two values λ1 and λ2 with λ1>λ2. Which of the following statements are true?

EASY
Physics>System>Development>Dual Nature of Light
What potential difference must be applied to an electron microscope to produce an electron beam of wavelength 0.41 A0?
HARD
Physics>System>Development>Dual Nature of Light
A silver ball of radius 4.8 cm is suspended by a thread in the vacuum chamber. UV light of wavelength 200 nm is incident on the ball for some time during which a total energy of 1×10-7 J falls on the surface. Assuming on an average one out of 103 photons incident is able to eject an electron, the potential on the sphere will be
MEDIUM
Physics>System>Development>Dual Nature of Light
Two particles A1 and A2 of masses m1 and m2 m1>m2 have the same de Broglie wavelength. Then,
HARD
Physics>System>Development>Dual Nature of Light
Explaining the concept of photon describe its various properties.
HARD
Physics>System>Development>Dual Nature of Light
Discuss briefly the experiment conducted by Hertz to produce and detect electromagnetic wave.