COMEDK 2023 Evening Shift | Dual Nature of Radiation Question 21 | Physics

Ultraviolet light of wavelength 99 mm falls on a metal plate of work function 1.0 eV. If the mass of the electron is 9.1 $$\times$$ 10$$^{-31}$$ kg, the wavelength of the fastest photoelectron emitted is

0.63 nm

0.66 nm

0.33 nm

0.36 nm

COMEDK 2022

MCQ (Single Correct Answer)

-0

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

$${K_1} > \left( {{{{K_2}} \over 3}} \right)$$

$${K_1} < \left( {{{{K_2}} \over 3}} \right)$$

$${K_1} = 2{K_2}$$

$${K_2} = 2{K_1}$$

COMEDK 2021

MCQ (Single Correct Answer)

-0

The velocity of the proton is one-fourth the velocity of the electron. What is the ratio of the de-Broglie wavelength of an electron to that of a proton?

$$1$$

$$\frac{1}{2}$$

$$\frac{1}{3}$$

$$\frac{1}{4}$$

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