Dual Nature of ...

Although we can know with great precision the pattern formed by huge numbers of photons passing through the lines on a diffraction grating, we cannot know at all where one single photon will go when it passes through the diffraction grating.
This statement describes the truth revealed by what theory?

A photo cell is a device which

Which of the following statement is correct? 

The de-Broglie wavelength associated with a particle with rest mass $$m_0$$ and moving with speed of light in vacuum is ___________.

If the wavelength is brought down from $$6000 \mathring{A}$$ to $$4000 \mathring{A}$$ in a photoelectric experiment, then what will happen ?

The de-Broglie wavelength associated with thermal neutron ( t=51C say) is of the order of the 

A proton is accelerated to $$225V$$. Its de-Broglie wavelength is:

De-Broglie wavelength of an atom at absolute temperature $$T\ K$$ will be

If the mass of a microscopic particle a well as its speed are halved, the de-broglie wavelength associated with the particle will

If a proton and electron have the same de-Broglie wavelength, then