Name: PHY 1020/1090 General Physics Fall 2017 Take Home Quiz 9 DUE IN CLASS WEDN

Question

Name: PHY 1020/1090 General Physics Fall 2017 Take Home Quiz 9 DUE IN CLASS WEDNESDAY November 29 (Note the different day A helium-neon laser emits red light having a wavelength of 6.4 × 10-7 m and a power of 0.5 mW. How many photons are emitted each second? 1. A photon whose energy is 8.00 × 10-1*) is scattered off an electron at a 90° angle, what is the wavelength of the scattered wave? 2. A photon whose wavelength is = 5.0 × 10-11 m is scattered straight backward. What is the wavelength of the scattered wave? 3, A neutron has a mass of 1.67 × 10-27 kg. Its de Broglie wavelength is 1.4 × 10-10 m, what is its kinetic energy (in ev)? 4.

Explanation / Answer

1. energy of a photon = h c / lambda

= (6.626 x 10^-34) (3 x 10^8) / (6.4 x 10^-7)

= 3.106 x 10^-19 J

P = n E t

0.5 x 10^-3 = n x 3.106 x 10^-19 x 1

n = 1.61 x 10^15 photons

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