A topaz crystal has an interplanar spacing of 1.36 Å. Calculate the wavelength of an X-ray that should be used if θ = 15.0°. You may assume first-order diffraction. (1 Å = 10⁻¹⁰ m)

Miner's coal distributors does not mine coal itself, nor does it even store or handle the coal. instead, miner's solicits orders for low sulfur coal from other firms, then purchases the required amount from suppliers and directs them to ship the coal to its customers. what is miner's