In photoelectric effect, the kinetic energy of photoelectrons increases linearly with the:

1. Wavelength of incident light
2. Frequency of incident light
3. Velocity of incident light
4. Atomic mass of an element

What is the work function of a metal if the threshold wavelength for the ejection of an electron is 330 nm?

1. 1.2 × 10^–18 J

2. 1.2 × 10^–20 J

3. 6 × 10^–19 J

4. 6 × 10^–12 J

A 100-watt bulb emits monochromatic light with a wavelength of 400 nm.
How many photons does it emit every second?
1. \(40.12 \times 10^{20} \ s^{-1}\)
2. \(2.012 \times 10^{21} \ s^{-1}\)
3. \(2.012 \times 10^{20} \ s^{-1}\)
4. \(20.12 \times 10^{21} \ s^{-1}\)

When electromagnetic radiation of wavelength 300 nm falls on the surface of sodium, electrons are emitted with a kinetic energy of 1.68 ×10⁵ J mol^–1. The minimum energy needed to remove an electron from sodium and the maximum wavelength that will cause a photoelectron to be emitted are, respectively:

1. 2.31 × 10⁵ J mol^–1, 517 nm

2. 23.1 × 10⁵ J mol^–1, 517 nm

3. 3.31 × 10⁵ J mol^–1, 417 nm

4. 33.1 × 10⁵ J mol^–1, 417 nm

Electrons are emitted with zero velocity from a metal surface when it is exposed to radiation of wavelength 6800 Å. The work function (W₀) of the metal is: 

1. 3.109 × 10^–20 J

2. 2.922 × 10^–19 J

3. 4.031 × 10¹⁹ J

4. 2.319 × 10^–18 J

A photon of wavelength 4 × 10^–7 m strikes a metal surface, the work function of the metal being 2.13 eV.  The kinetic energy of emission would be:

Calculate the work function of silver metal, given that a stopping voltage of 0.35 eV is applied and the radiation has a wavelength of 256.7 nm.

1. 3.40 eV

2. 5.18 eV

3. 4.48 eV

4. –4.40 eV