KCET 2021 | Dual Nature of Radiation Question 11 | Physics

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

KCET 2021

MCQ (Single Correct Answer)

-0

According to Einstein's photoelectric equation to the graph between kinetic energy of photoelectrons ejected and the frequency of incident radiation is

KCET 2021 Physics - Dual Nature of Radiation Question 15 English Option 1

KCET 2021 Physics - Dual Nature of Radiation Question 15 English Option 2

KCET 2021 Physics - Dual Nature of Radiation Question 15 English Option 3

KCET 2021 Physics - Dual Nature of Radiation Question 15 English Option 4

KCET 2020

MCQ (Single Correct Answer)

-0

A hot filament liberates an electron with zero initial velocity. The anode potential is $$1200 \mathrm{~V}$$. The speed of the electron when it strikes the anode is

$$1.5 \times 10^5 \mathrm{~ms}^{-1}$$

$$2.5 \times 10^6 \mathrm{~ms}^{-1}$$

$$2.1 \times 10^7 \mathrm{~ms}^{-1}$$

$$2.5 \times 10^8 \mathrm{~ms}^{-1}$$

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