COMEDK 2024 Evening Shift | Dual Nature of Radiation Question 2 | Physics

A particle of mass $$2 \mathrm{mg}$$ has the same wavelength as a neutron moving with a velocity of $$3 \times 10^5 \mathrm{~ms}^{-1}$$. The velocity of the particle is (mass of neutron is $$1.67 \times 10^{-27} \mathrm{Kg}$$)

$$2.5 \times 10^{-16} \mathrm{~ms}^{-1}$$

$$1.5 \times 10^{-13} \mathrm{~ms}^{-1}$$

$$2.5 \times 10^{-13} \mathrm{~ms}^{-1}$$

$$1.5 \times 10^{-16} \mathrm{~ms}^{-1}$$

COMEDK 2024 Afternoon Shift

MCQ (Single Correct Answer)

-0

The velocity of an electron so that its momentum is equal to that of a photon of wavelength $$660 \mathrm{~nm}$$ is

$$ 109.88 \mathrm{~cm} \mathrm{~s}^{-1} $$

$$ 1098 \mathrm{~ms} ^{-1} $$

$$ 1098 \mathrm{~cm} \mathrm{~s}^{-1} $$

$$ 109 \mathrm{~ms} ^{-1} $$

COMEDK 2024 Afternoon Shift

MCQ (Single Correct Answer)

-0

$$\mathrm{K}_1$$ and $$\mathrm{K}_2$$ are maximum kinetic energies of photoelectrons emitted when lights of wavelength $$\lambda_1$$ and $$\lambda_2$$ respectively are incident on a metallic surface. If $$\lambda_1=3 \lambda_2$$, then

$$ \mathrm{K}_1=\left(\frac{1}{3}\right) \mathrm{K}_2 $$

$$ \mathrm{K}_1>3 \mathrm{~K}_2 $$

$$ \mathrm{K}_1>\left(\frac{1}{3}\right) \mathrm{K}_2 $$

$$ \mathrm{K}_1<\left(\frac{1}{3}\right) \mathrm{K}_2 $$

COMEDK 2024 Morning Shift

MCQ (Single Correct Answer)

-0

The threshold frequency for a metal surface is '$$n_0$$'. A photo electric current '$$I$$' is produced when it is exposed to a light of frequency $$\left(\frac{11}{6}\right) \mathrm{n}_{\mathrm{o}}$$ and intensity $$\mathrm{I}_{\mathrm{n}}$$. If both the frequency and intensity are halved, the new photoelectric current '$$\mathrm{I}^1$$' will become:

$$\mathrm{I}^1=\frac{1}{4} \mathrm{I}$$

$$\mathrm{I}^1=2 \mathrm{I}$$

$$\mathrm{I^1=0}$$

$$\mathrm{I}^1=\frac{1}{2} \mathrm{I}$$

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