For a body emitting blackbody radiation, the total power emitted is proportional to the 4th power of the body's absolute temperature: (T in kelvins) and the wavelength of the emitted EM radiation that has the highest intensity is inversely proportional to the body's absolute temperature according to: ( in meters, T in kelvins) Assume an object is emitting blackbody radiation. A body in a room at
300 K is heated to 3,000 K. The wavelength of the most intense EM radiation emitted by the body at 3,000 K is the wavelength of the most intense EM radiation at 300 K.
a. 0.0001 times
b. 0.1 times
c. the same as
d. 10 times
e. 10,000 times
b
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Radioactive Decay: A sample containing 4.0 × 1018 atoms of a radioactive isotope decays with a half-life of 2.3 years. How many undecayed atoms are left after 3.7 years?
A. 2.5 × 1018 B. 1.7 × 1018 C. 1.3 × 1018 D. 1.1 × 1018
A longitudinal wave travels on a slinky or any long spring. The wave is represented by the equation z(z, t) = 1.2 cm cos(1800 rad/s t + 60
z). What is the wave vector of the wave?
A. 60 
in the + z direction
B. 60 in the - z direction
C. 60 in the + x direction
D. 60 in the - x direction
If the ground state energy level of a proton in a rigid box is 5.0 MeV, what is the width of the box?
A) 2.7 × 10-13m B) 6.4 × 10-15m C) 2.7 × 10-15m D) 6.4 × 10-14m E) 6.4 × 10-13m
The pressure of an interstellar gas cloud depends on the cloud's ____________________ and ____________________
Fill in the blank(s) with correct word