AP EAPCET 2024 - 22th May Evening Shift | Dual Nature of Radiation Question 13 | Physics

Light of wavelength $4000\mathop {\rm{A}}\limits^{\rm{o}}$ is incident on a sodium surface for which the threshold wavelength of photoelectrons is $5420 \mathop {\rm{A}}\limits^{\rm{o}}$. The work function of sodium is

4.58 eV

2.29 eV

1.14 eV

0.57 eV

AP EAPCET 2024 - 22th May Morning Shift

MCQ (Single Correct Answer)

-0

The surface of a metal is first illuminated with a light of wavelength 300 nm and later illuminated by another light of wavelength 500 nm . It is observed that the ratio of maximum velocities of photoelectrons in two cases is 3 . The work function of metal value is close to

6.48 eV

1.23 eV

4.17 eV

2.28 eV

AP EAPCET 2024 - 21th May Evening Shift

MCQ (Single Correct Answer)

-0

The maximum wavelength of light which causes photoelectric emission from photosensitive metal surface is $\lambda_0$. Two light beams of wavelengths $\frac{\lambda_0}{3}$ and $\frac{\lambda_0}{9}$ incident on the metal surface. The ratio of the maximum velocities of the emitted photoelectrons is

$3: 4$

$1: 3$

$1: 2$

$2: 3$

AP EAPCET 2024 - 21th May Morning Shift

MCQ (Single Correct Answer)

-0

A blue lamp emits light of mean wavelength $4500$ Å. The lamp is rated at 150 W and $8 \%$ efficiency. Then, the number of photons are emitted by the lamp per second

$27.17 \times 10^{18}$

$17.17 \times 10^{18}$

$27.17 \times 10^{15}$

$54 \times 10^{16}$

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