AP EAPCET 2024 - 18th May Morning Shift | Dual Nature of Radiation Question 9 | Physics

Energy required to remove an electron from aluminium surface is 4.2 eV . If light of wavelength $2000 \mathring{A}$ falls on the surface, the velocity of the fastest ejected electron the surface will be

$84 \times 10^5 \mathrm{~ms}^{-1}$

$7.4 \times 10^6 \mathrm{~ms}^{-1}$

$64 \times 10^5 \mathrm{~ms}^{-1}$

$84 \times 10^6 \mathrm{~ms}^{-1}$

AP EAPCET 2022 - 5th July Morning Shift

MCQ (Single Correct Answer)

-0

The following statement is correct in the case of photoelectric effect

For a given frequency of incident radiation, the stopping potential varies linearly with its intensity.

For a given frequency of incident radiation, the photocurrent is independent of its intensity.

For a given frequency of a incident radiation, the maximum kinetic energy of the photoelectrons is independent of its intensity.

For a frequency lower than cutoff frequency, photoelectric emissions can occur if intensity of incident light is increased slightly.

AP EAPCET 2022 - 4th July Evening Shift

MCQ (Single Correct Answer)

-0

In a photoelectric experiment light of wavelength 800 nm produces photoelectrons with the smallest de-Broglie wavelength of 1 nm . Light of 400 nm produces photoelectrons with smallest de-Broglie wavelength of 0.5 nm. Then the work function of the metal used in the experiment is nearly.

1.03 eV

0.53 eV

2.03 eV

4.02 eV

AP EAPCET 2022 - 4th July Morning Shift

MCQ (Single Correct Answer)

-0

The metal which has the highest work function in the following is

Cesium (Cs)

Sodium ( Na )

Aluminium (Al)

Platinum (Pt)

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