JEE Main 2024 (Online) 30th January Evening Shift | Dual Nature of Radiation Question 19 | Physics

If the total energy transferred to a surface in time $$\mathrm{t}$$ is $$6.48 \times 10^5 \mathrm{~J}$$, then the magnitude of the total momentum delivered to this surface for complete absorption will be:

$$2.16 \times 10^{-3} \mathrm{~kg} \mathrm{~m} / \mathrm{s}$$

$$2.46 \times 10^{-3} \mathrm{~kg} \mathrm{~m} / \mathrm{s}$$

$$1.58 \times 10^{-3} \mathrm{~kg} \mathrm{~m} / \mathrm{s}$$

$$4.32 \times 10^{-3} \mathrm{~kg} \mathrm{~m} / \mathrm{s}$$

JEE Main 2024 (Online) 30th January Morning Shift

MCQ (Single Correct Answer)

-1

The work function of a substance is $$3.0 \mathrm{~eV}$$. The longest wavelength of light that can cause the emission of photoelectrons from this substance is approximately;

215 nm

400 nm

414 nm

200 nm

JEE Main 2024 (Online) 29th January Evening Shift

MCQ (Single Correct Answer)

-1

Two sources of light emit with a power of $$200 \mathrm{~W}$$. The ratio of number of photons of visible light emitted by each source having wavelengths $$300 \mathrm{~nm}$$ and $$500 \mathrm{~nm}$$ respectively, will be :

$$5: 3$$

$$3: 5$$

$$1: 5$$

$$1: 3$$

JEE Main 2024 (Online) 29th January Morning Shift

MCQ (Single Correct Answer)

-1

The de-Broglie wavelength of an electron is the same as that of a photon. If velocity of electron is $$25 \%$$ of the velocity of light, then the ratio of K.E. of electron and K.E. of photon will be:

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

$$\frac{8}{1}$$

$$\frac{1}{8}$$

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

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