Which of the following cannot be explained with a wave theory of light?
polarisation
interference
photoelectric effect
all the above
Light appears to travel in a straight line because
wavelength of light is vey small
frequency of light is very small
light consists of very small particles
velocity is different for different colours
What is called the method of raising a particle from lower state to higher energy state?
Pumping
Pumping source
Population inversion
None of these.
Which of the following phenomena would Newton have been unable to explain using his corpuscular theory of light?
reflection
refraction
diffraction
What principle is responsible for light spreading as it passes through a narrow slit?
polarization
When does the phenomenon Luminescence happen?
Photons emit while excited electrons drops down
Knocking out of electrons by photons
Photons stimulated by photons
All
In which unit is the Planck’s constant expressed?
Joule
Joule-hertz
Joule-second
Newton-second
In observing the diffraction pattern of a laser beam, you notice that the laser beam passes forward through a single slit with almost no spherical diffraction. What does this tell you about the wavelength of the laser with respect to the slit size?
the slit size is much smaller than the wavelength of light
this cannot be determined without knowing the distance from the slit to the screen
the slit size is almost exactly the same size as the wavelength of light
the slit size is much larger than the wavelength of light
In a Young's double slit experiment, if the separation between the slits decreases, what happens to the distance between the interference fringes?
It remains the same
It increases
It decreases.
There is not enough information to determine.
Which of the following properties is a characteristic of the light waves from a laser?
The waves all have the same frequency
The waves are all in step with one another
The waves form a narrow beam
All of the above are true
