How many atoms are in the unit cell in the simple cubic structure? Express your

Question

How many atoms are in the unit cell in the simple cubic structure? Express your answer using an integer. X-ray diffractometers often use metals that have had their core electrons excited as a source of X rays. Consider the 2p rightarrow 1s transition for copper, which is called the K_alpha transition. You may want to reference Section 12.9 while completing this problem. Calculate the wavelength of X rays (in angstroms) given off by the K_alpha transition if the energy given off by a mole of copper atoms is 7.77 times 10^5 kJ. (Note that 1 A = 10^-10 m.) Express the wavelength to three significant figures.

Explanation / Answer

1. for simple cubic strcuctre , no.of unit cell = 1/8*8 = 1

2. E = hc/ lamda = 6.6* 10^-34 * 3*10^8 / lamda

lamda= 6.6* 10^-34 * 3*10^8 / 7.77* 10^8 j= 1.53 angstrom

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