KCET 2022 | Dual Nature of Radiation Question 5 | Physics

The de-Broglie wavelength of a particle of kinetic energy $$K$$ is $$\lambda$$, the wavelength of the particle, if its kinetic energy $$\frac{K}{4}$$ is

$$2 \lambda$$

$$\frac{\lambda}{2}$$

$$4 \lambda$$

$$\lambda$$

KCET 2022

MCQ (Single Correct Answer)

-0

In a photo electric experiment, if both the intensity and frequency of the incident light are doubled, then the saturation photoelectric current

is halved

is doubled

becomes four times

remains constant

KCET 2021

MCQ (Single Correct Answer)

-0

The work-function of a metal is 1 eV. Light of wavelength $$3000 \mathop A\limits^o$$ is incident on this metal surface. The velocity of emitted photoelectrons will be

$$10 \mathrm{~ms}^{-1}$$

$$1 \times 10^3 \mathrm{~ms}^{-1}$$

$$1 \times 10^4 \mathrm{~ms}^{-1}$$

$$1 \times 10^6 \mathrm{~ms}^{-1}$$

KCET 2021

MCQ (Single Correct Answer)

-0

A proton moving with a momentum $$p_1$$ has a kinetic energy $$1 / 8$$th of its rest mass-energy. Another light photon having energy equal to the kinetic energy of the possesses a momentum $$p_2$$. Then, the ratio $$\frac{p_1-p_2}{p_1}$$ is equal to

1/4

1/2

3/4

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