Photon and Photoelectric Effects

Which statement about a photon is correct?

• A particle with high penetrating power

• A particle that emits light

• A discrete package of light energy

• A positively charge particle that travels at high speed

What is the energy of a photon of red light of wavelength 700 nm?

• $2.8\times10^{-19}\ J$

• $4.6\times10^{-19}\ J$

• $2.0\times10^{-25}\ J$

• $1.6\times10^{-32}\ J$

Which of the following is the experimental evidence that light energy is in discrete quantity known as photon?

• Visible light spectrum

• Line spectrum of hydrogen gas

• Production of X-rays

• Diffraction of light by a diffraction grating

The energy of a photon of light is E. Which is the correct expression for its wavelength, λ?

• $\lambda=\frac{hE}{c}$

• $\lambda=\frac{E}{hc}$

• $\lambda=\frac{hc}{E}$

• $\lambda=\frac{Ec}{h}$

Among the photons of red, blue and green light, which of the following is in the correct order of increasing energy?

• Red, blue, green

• Red, green, blue

• Green, blue, red

• Green, red, blue

Which graph correctly shows the relationship between the energy, E of a photon of light with the wavelength, λ?

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Photoelectric effect is the emission of

• light by fast electrons

• electrons when light falls on a metal surface

• light when electrons hit a metal surface

• electrons when a metal is heated by an electric current

When a copper plate is illuminated by light, no photoelectrons are emitted. Which is the correct explanation?

• The duration of the copper plate exposed to light is not sufficient

• The work function of copper is lower than the energy of a light photon

• The intensity of light is insufficient for the emission of photoelectrons

• The frequency of light is lower than the threshold frequency of copper