Photo EE

A photon of wavelength 550 nm and energy 3.6 × 10-19 J, falls on a metal surface, If the ejected electron has a velocity of 2.96 × 10⁵ m/s,   

A) Calculate the kinetic energy of the electron? (me = 9.11 × 10^-31 kg)

• 4 x 10^-20 J

• 5 x 10^-20 J

• 6 x 10^-20 J

• 7 x 10^-20 J

A photon of wavelength 550 nm and energy 3.6 × 10^-19 J, falls on a metal surface, If the ejected electron has a velocity of 2.96 × 10⁵ m/s,   and kinetic energy of 4 x 10^-20 J, Calculate the work function of the metal being used, in eV?

• 2.0 eV

• 3.0 eV

• 4.0 eV

• 5.0 eV

A photon of wavelength 550 nm , falls on a metal surface, If the ejected electron has a velocity of

2.96 × 10⁵ m/s, Calculate the work function of the metal being used, in eV? (h = 6.63 x 10^-34 J.s)

• 2.0 eV

• 4.0 eV

• 6.0 eV

• 10.0 eV

Calculate the energy of a photon of a Blue light having wavelength 450 nm. (h = 6.63 x 10^-34 Js)

• 4.42 x 10^-19 J

• 5.42 x 10^-19 J

• 6.42 x 10^-19 J

• 7.42 x 10^-19 J

Who refused to accept the wave theory of light and why ?

• Newton, because if light is a wave then it should bend around the corners.

• Newton, because if light is a wave then it should not bend around the corners.

• Newton, because if light is a wave then it should not diffract around the corners.

• Newton, because if light is a wave then it should not refract.

What was the conclusion of Albert Einstein about the nature of light?

  Light possessed the characteristics of both particle and wave.

• Light possessed the characteristics of particle only.

• Light possessed the characteristics of wave only.

• Light possessed the characteristics of both wave and particle.

• None.

What is Photoelectric Effect?

• A phenomena in which electrons are emitted from a metal surface when visible and UV light are directed onto it.

• A phenomena in which the light bends when enters into a denser medium.

• A phenomena in which the light diffracts around the corners.

• A phenomena in which the light totally internally reflected.

Which of the following set up is showing Photoelectric Effect?

• 
• 
• 
• 

What is a Work Function ?

• The minimum amount of energy required to start the emission of electrons from a metal's surface.

• The amount of work required to move an object a distance of 1 m.

• The minimum amount of energy required to run the function of a circuit.

• The minimum amount of energy required to start the emission of light from a metal's surface.

What is Threshold Frequency ?

• The minimum amount of frequency required to

  start the emission of electrons from the

  metal surface.

• The frequency of light required to

  start the refraction phenomena.

• The frequency of a wave that is required to produce standing waves.