What wavelength (in ?m) is associated with the Paschen series for n = 4? (RH = 1.097 × 10^7 m?1)
a. 320
b. 530
c. 2.7
d. 1.9
e. 0.5
d
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The number 52,600,000,000 would be written in scientific notation as ____________________
Fill in the blank(s) with correct word
Total Internal Reflection: A ray of light traveling in air makes a 63.0° angle with respect to the normal of the surface of a liquid. It travels in the liquid at a 39.2° angle with respect to the normal. Find the critical angle for total internal reflection for this interface.
Fill in the blank(s) with the appropriate word(s).
Given that the charge on an up quark is +2/3 and the charge on a down quark is ?1/3, which combination represents a proton?
A. uud B. udd C. uuu D. ddd
A Geiger counter registers a count rate of 8,000 counts per minute from a sample of a radioisotope. The count rate 24 minutes later is 1,000 counts per minute. What is the half-life of the radioisotope?