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How many electron volts make up one joule?

Important Questions on Dual Nature of Radiation and Matter
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What is de-Broglie wavelength of a object moving at a speed of ?

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What is a photon? State its properties.

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An electron and an alpha particle have same kinetic energy. How are the de Broglie wavelengths associated with them related?

HARD
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The two lines A and B, shown in the graph of Fig. , plot the de-Broglie wavelength as a function of for two particles, having the same charge . Which of the two represents particle of the heavier mass?

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In photoelectric effect, the slope of stopping potential versus frequency of incident light for a given surface will be

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Wave nature of light cannot explain photoelectric effect because in photoelectric effect, it is seen that

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In photoelectric effect, the curve between photoelectric current and anode potential (for different frequencies) is shown in figure, then

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When a point source of light is at a distance of from a photoelectric cell, the cut-off voltage is found to be If the same source is placed at a distance of from the cell, then the cut-off voltage will be
