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WorksheetsQUANTUM THEORY OF LIGHT
Total questions: 10
Worksheet time: 7mins
Which of the following electromagnetic waves has the highest frequency?
Gamma rays
UV rays
Visible light
Radio waves
Which of the following electromagnetics waves has the longest wavelength?
Gamma rays
UV rays
Microwaves
Radio waves
What is the range of wavelength for the visible light?
400 - 750 cm
400 - 750 mm
400 - 750 nm
400 - 750 km
A black body is ............................
an idealised body that is able to reflect all electromagnetic radiation that falls on it.
an idealised body that is able to absorb all electromagnetic radiation that falls on it.
an idealised body that is able to refract all electromagnetic radiation that falls on it.
an idealised body that is able to diffract all electromagnetic radiation that falls on it.
All scientists below proposed classical theory of light except...
Isaac Newton
Thomas Young
Albert Einstein
J.J. Thomson
All scientists below proposed quantum theory of light except...
Max Planck
John Dalton
Louis de Broglie
Niels Bohr
Calculate the energy of a 750 nm light photons.
Given: E = hf, c = fƛ, h = 6.63 × 10–34 Js, c = 3.00 × 108 ms–1
1.65 × 10–19 J
2.65 × 10–19 J
3.65 × 10–19 J
4.65 × 10–19 J
A 50 W lamp emits red light with a wavelength,
ƛ = 7.0 × 10–7m. What is the number of photons emitted per second?
Given:
P = nhc/ƛ , h = 6.63 × 10–34 Js, c = 3.00 × 108 m s–1
1.76 × 1020 s–1
2.76 × 1020 s–1
3.76 × 1020 s–1
4.76 × 1020 s–1
A red laser pen emits light with a wavelength of 670 nm. If the number of photons emitted is 3.37 × 1018 per second, what is the output power of the laser pen?
Given:
P = nhc/ƛ , h = 6.63 × 10–34 Js, c = 3.00 × 108 m s–1
1.00 W
2.00 W
3.00 W
4.00 W
Name a phenomenon that shows the wave properties of electrons.
Reflection
Refraction
Dispersion
Propagation
