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Recent questions tagged particle-nature-of-light-photon

The energy of a photon is equal to the KE of a proton. The energy of the photon is E. Let $ \lambda_1$ be the de- Broglie wavelength of the proton and $ \lambda_2$ be the wavelength of the photon. So, $\large\frac{\lambda_1}{\lambda_2}$ is

asked Dec 31, 2013 by thanvigandhi_1

1 answer

A radiation of energy $E$ falls normally on a perfectly reflecting surface. The momentum transferred to the surface

asked Dec 30, 2013 by thanvigandhi_1

1 answer

A monoenergetic electron beam with speed of $ 5.2 \times 10^6\: m/s$ is subjected to a magnetic field of $1.3 \times 10^{-4}T$ normal to the beam velocity. What is the radius of the circle traced by the beam, given $ \large\frac{e}{m}$ for electron equals $1.76 \times 10^{11}C /kg$?

asked Dec 30, 2013 by thanvigandhi_1

1 answer

Mark the correct one

asked Dec 27, 2013 by thanvigandhi_1

1 answer

Crystal diffraction experiments can be performed using X – rays, or electrons accelerated through appropriate voltage. Which probe has greater energy? (Take wavelength of probe = $1 A^{\circ}$ )

asked Dec 27, 2013 by thanvigandhi_1

1 answer

Find the number of photons entering the pupil of our eye per second corresponding to the minimum intensity of white light that humans can perceive $(10^{-10}W/m^2$ ).( Assume area of pupil to be $0.4 cm^2$ , and average frequency of white light to be $6 \times 10^{14}Hz)$

asked Dec 25, 2013 by thanvigandhi_1

1 answer

The energy $E$ and the momentum $p$ of photon are given by $E=hn\: and\: p=h/\lambda$ respectively. The velocity of photon will be

asked Dec 24, 2013 by thanvigandhi_1

1 answer

The momentum of a photon of energy $1MeV$ in kgm/s, will be

asked Dec 23, 2013 by thanvigandhi_1

1 answer

A 100 W sodium lamp radiates energy uniformly in all directions. The lamp is located at the centre of a large sphere that absorbs all the sodium light which is incident on him. The $ \lambda$ of sodium light is 589 nm. At what rate are the photons delivered to the sphere ?

asked Dec 23, 2013 by thanvigandhi_1

1 answer

The energy flux of sunlight reaching the surface of the earth is $ 1.388 \times 10^3 \: W/m^2$. How many photons per square meter are incident on earth per second ? Assume that the photons in the sunlight have an average wavelength of 550 nm.

asked Dec 23, 2013 by thanvigandhi_1

1 answer

Monochromatic light of wavelength 632.8 nm is produced by a helium-neon laser. The power emitted is 9.42 mW. How many photons per second, on the average, arrive at a target irradiated by this beam ? (Assume the beam to have uniform cross - section which is less than the target area )

asked Dec 23, 2013 by thanvigandhi_1

1 answer

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