When X-rays of wavelength λ = 0.2 nm are reected o the face of a crystal, a Bragg maximum is observed at a glancing angle of θ = 17.5 o , with sucient intensity that it is judged to be rst order. (a) What is the spacing d between the crystal planes that are parallel to the face in question? (b) What are the glancing angles of all higher order maxima?

Which of the following represents a virtual image?

In which situation has the independent variable for the experiment been changed? check all that apply. changed from counting the number of duckweed at day 0 and day 14 to counting them every day changed from testing duckweed growth in beakers to testing duckweed growth in large outdoor tanks changed from testing the effect of ph on duckweed growth to testing the effect of light levels on duckweed growth changed from testing the effect of acid ph on duckweed growth to testing the effect of basic ph on duckweed growth

Which configuration would produce an electric current? a) rotate a coil of copper wire between two magnets. b) connect a wire between a copper and zinc strip sitting in a beaker of water. c) connect a wire to the (+) positive end of a battery and the other end to a light bulb. d) connect a wire to the negative end of a battery and the other end to a light bulb.