Which of the following devices is used in this experiment to separate the different wavelengths emitted by the light source?

a. prism
b. a transmission grating
c. a reflection grating
d. all of the above

An implanted pacemaker supplies the heart with 72 pulses per minute, each pulse providing 6.0 v for 0.65 ms. the resistance of the heart muscle between the pacemaker’s electrodes is 550 ω. find (a) the current that flows during a pulse, (b) the energy delivered in one pulse, and (c) the average power supplied by the pacemaker.

In a given chemical reaction, the energy of the products is greater than the energy of the reactants. which statement is true for this reaction?

1. how to locate the image in converging(concave) mirror and diverging (convex) mirror with salt. 2. how to locate the image in a converging (convex) lens and diverging (concave) lens with salt.