KCET 2024 | Dual Nature of Radiation Question 2 | Physics

The photoelectric work function for photo metal is 2.4 eV . Among the four wavelengths, the wavelength of light for which photoemission does not take place is

200 nm

300 nm

700 nm

400 nm

KCET 2023

MCQ (Single Correct Answer)

-0

A 60 W source emits monochromatic light of wavelength 662.5 nm. The number of photons emitted per second is

$$5\times10^{17}$$

$$2\times10^{20}$$

$$5\times10^{26}$$

$$2\times10^{29}$$

KCET 2023

MCQ (Single Correct Answer)

-0

In an experiment to study photoelectric effect the observed variation of stopping potential with frequency of incident radiation is as shown in the figure. The slope and $$y$$-intercept are respectively

KCET 2023 Physics - Dual Nature of Radiation Question 16 English

$$\frac{h}{e},-\frac{h v_0}{e}$$

$$\frac{h v}{e}, v_0$$

$$\frac{h v}{e},-\frac{h}{e}$$

$$h v_1-h v_0$$

KCET 2023

MCQ (Single Correct Answer)

-0

The energy gap of an LED is $$2.4 \mathrm{~eV}$$. When the LED is switched ON, the momentum of the emitted photons is

$$1.28 \times 10^{-27} \mathrm{~kg} \mathrm{~ms}^{-1}$$

$$2.56 \times 10^{-27} \mathrm{~kg} \mathrm{~ms}^{-1}$$

$$1.28 \times 10^{-11} \mathrm{~kg} \mathrm{~ms}^{-1}$$

$$0.64 \times 10^{-27} \mathrm{~kg} \mathrm{~ms}^{-1}$$

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