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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 2 kg object moving at a speed of 1 ms-1?
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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?
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The two lines A and B, shown in the graph of Fig. 20.18, plot the de-Broglie wavelength λ as a function of 1V V is the accelerating potential for two particles, having the same charge q. 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 V (for different frequencies) is shown in figure, then

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When a point source of light is at a distance of 50 cm from a photoelectric cell, the cut-off voltage is found to be V0. If the same source is placed at a distance of 1 m from the cell, then the cut-off voltage will be