KCET 2019 | Dual Nature of Radiation Question 17 | Physics

An electron is moving with an initial velocity $$\mathbf{v}=v_0 \hat{\mathbf{i}}$$ and is in a uniform magnetic field $$\mathbf{B}=B_0 \hat{\mathbf{j}}$$. Then its de-Broglie wavelength

remains constant

increases with time

decrease with time

increase and decrease periodically

KCET 2019

MCQ (Single Correct Answer)

-0

Light of certain frequency and intensity incident on a photosensitive material causes photoelectric effect. If both the frequency and intensity are doubled, the photoelectric saturation current becomes

quadruple

doubled

halved

unchanged

KCET 2018

MCQ (Single Correct Answer)

-0

The number of photons falling per second on a completely darkened plate to produce a force of $6.62 \times 10^{-5} \mathrm{~N}$ is $n$. If the wavelength of the light falling is $5 \times 10^{-7} \mathrm{~m}$, then $n=$ $\ldots \ldots \ldots \times 10^{22}$. (Take, $h=6.62 \times 10^{-34} \mathrm{~J}-\mathrm{s}$ )

0.2

3.3

KCET 2018

MCQ (Single Correct Answer)

-0

The maximum kinetic energy of emitted photoelectrons depends on

intensity of incident radiation

frequency of incident radiation

speed of incident radiation

number of photons in the incident radiation

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