The speed of a 10-kHz sound wave in seawater is approximately 1500 m/s. What is its wavelength in sea water?
a. 5.0 cm
b. 10 cm
c. 15 cm
d. 20 cm
e. 29 cm
c
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Radioactive Decay: A test tube of an isotope having a decay constant of 0.765 × 10-6 s-1 contains 3.0 × 1017 nuclei of this isotope.(a) What is the half-life of this isotope?(b) What is the initial activity (in Bq) of the isotope?(c) What is the activity of the isotope after 12 days?
What will be an ideal response?
Light of colors 1 and 2 are sent through a prism and the rays of light of color 2 bend more. Which of the following is not true?
a. The index of refraction for color 2 is greater than that for color 1. b. The two colors of light have different frequencies associated with them. c. The speed of light for color 2 is greater than that for color 1 in this prism. d. The wavelength for color 1 is different than that for color 2 in this prism.
A 50-kg satellite circles planet Cruton every 5.6 h in an orbit with a radius of 12 × 10^6 m. What is the magnitude of the gravitational force on the satellite by planet Cruton?
a. 63 N b. 58 N c. 68 N d. 73 N e. 50 N
Electromagnets work by aligning little regions of magnetic field in iron so they mostly point in the same direction. This produces a greatly strengthened magnetic field. This is correct
Electromagnets' domains are aligned by the current in the coil. 17 . If a normal D-cell battery is used in a device, for every 1.0 C of charge that moves through the battery, 1.5 J of work is done on the charge.