COMEDK 2022 | Dual Nature of Radiation Question 12 | Physics

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?

$$1$$

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

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

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

COMEDK 2021

MCQ (Single Correct Answer)

-0

From the figure describing photoelectric effect, we may infer correctly that

COMEDK 2021 Physics - Dual Nature of Radiation Question 15 English

Na and Al both have the same threshold frequency

Maximum kinetic energy for both the metals depends linearly on the frequency

the stopping potential are different for Na and Al for the same change in frequency

Al is better photosensitive material than Na

COMEDK 2020

MCQ (Single Correct Answer)

-0

Light of frequency 10¹⁵ Hz falls on a metal surface of work function 2.5 eV. The stopping potential of photoelectrons (in V) is

1.6

2.5

4.1

6.6

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