is the wavelength of photon of energy $35\mathrm{keV}$ .
 

Important Questions on Dual Nature of Matter and Radiation

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Physics Crash Course NEET>Chapter 19 - Dual Nature of Matter and Radiation>Level 3>Q 14

A $200\mathrm{ }\mathrm{W}$ sodium street lamp emits yellow light of wavelength $0.6\mu m.$ Assuming it to be $25\%$ efficient in converting electrical energy to light, the number of photons of yellow light emitted per second is

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Physics Crash Course NEET>Chapter 19 - Dual Nature of Matter and Radiation>Level 3>Q 15

The correct curve between intensity of scattered electrons ($\mathrm{I}$) and the angle of diffraction ($\mathrm{\varphi }$) in Davisson-Germer experiment is:

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Physics Crash Course NEET>Chapter 19 - Dual Nature of Matter and Radiation>Level 3>Q 16

The de Broglie wavlength associated with an electron having kinetic energy of $10 \mathrm{eV}$ is:

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Physics Crash Course NEET>Chapter 19 - Dual Nature of Matter and Radiation>Level 3>Q 17

The energy that should be added to an electron to reduce its de Broglie wavelength from $1$ $\mathrm{nm}$ to $0.5 \mathrm{nm}$ is:

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Physics Crash Course NEET>Chapter 19 - Dual Nature of Matter and Radiation>Level 3>Q 18

If the average kinetic energy of matter waves is $kT$, then the wavelength of de Broglie waves associated with neutrons at room temperature $\mathrm{T}$ is:

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Physics Crash Course NEET>Chapter 19 - Dual Nature of Matter and Radiation>Level 3>Q 19

The curves $\left(a\right),\left(b\right),\left(c\right)$ and $\left(d\right)$ show the variation between the applied potential difference $\left(V\right)$ and the photoelectric current $I$, at two different intensities of light $\left(I_1>I_2\right)$. In which figure is the correct variation shown?

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Physics Crash Course NEET>Chapter 19 - Dual Nature of Matter and Radiation>Level 3>Q 20

The work functions of tungsten and sodium are $5.06 \mathrm{eV}$ and $2.53 \mathrm{eV}$, respectively. If the threshold wavelength for sodium is $5896 \stackrel{\circ }{\mathrm{A}}$, then the threshold wavelength for tungsten will be

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Physics Crash Course NEET>Chapter 19 - Dual Nature of Matter and Radiation>Level 3>Q 21

For a photoelectric cell, the graph showing the variation of cut off voltage $\left(V_0\right)$ with frequency $\left(\nu \right)$ of the incident light is best represented by: