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# Thomson's e/m apparatus, diffraction grating Compton Effect

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1. An electron entering Thomson's e/m apparatus (Figure 3.2 and 3.3) has an initial velocity (in horizontal direction only) of 0.7 107 m/s. Lying around the lab is a permanent horseshoe magnet of strength 1.3 10-2 T, which you would like to use.

Figure 3.2

Figure 3.3

(b) When the magnetic field is turned off, but the same electric field remains, how large a deflection will occur if the region of nonzero E and B fields is 2 cm long?
cm

2. Light from a slit passes through a transmission diffraction grating of 330 lines/mm, which is located 2.2 m from a screen. What are the distances on the screen (from the unscattered slit image) of the three brightest visible (first-order) hydrogen lines?
Red cm

Blue-green cm

Violet cm

I need help in only last violet answer..rest all are correct...

3. (a) Estimate the power radiated by a 25 cm diameter basketball at 18Â°C.
wrong check mark

W
(b) Estimate the power radiated by a human body (assume a tempertare of 37Â°C). (Approximate this as a rectangular solid of dimensions 1.9 m by 0.3 m by 0.2 m.)
wrong check mark

W

4. A photon having 27 keV scatters from a free electron at rest. What is the maximum energy that the electron can obtain?
keV

https://brainmass.com/physics/power/thomson-s-e-m-apparatus-diffraction-grating-compton-effect-96154

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1. An electron entering Thomson's e/m apparatus (Figure 3.2 and 3.3) has an initial velocity (in horizontal direction only) of 0.7 107 m/s. Lying around the lab is a permanent horseshoe magnet of strength 1.3 10-2 T, which you would like to use.

Figure 3.2

Figure 3.3

(b) When the magnetic field is turned off, but the same electric field remains, how large a deflection will occur if the region of nonzero E and B fields is 2 ...

#### Solution Summary

Several questions on deflation of electron in a Thomson's e/m apparatus, diffraction grating, radiation and Compton effect have been solved. This 3-page word document explains in detail the solution to all the problems.

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