Two tuning forks with frequencies 264 and 262 Hz produce "beats". What is the beat frequency (in Hz)?
A. 4
B. 2
C. 1
D. 3
E. 0 (no beats are produced)
Answer: B
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_______ has the most tightly bound nucleus
a. Uranium b. Iron c. Helium d. Hydrogen
The distance between the object and the eyepiece of a compound microscope is 25.0 cm. The focal length of its objective lens is 0.200 cm and the eyepiece has a focal length of 2.60 cm
A person with a near point of 25.0 cm and a far point at infinity is using the microscope. (a) What is the angular magnification obtainable using the eyepiece alone as a magnifying lens if the final image is at the person's far point? (b) What is the total magnification of the microscope when used by the person of normal eyesight?
The activity of a radioactive source is often
measured in a unit called? a) the joule b) the u c) the microgram d) the cpm