The Moon's angular diameter in our sky is measured to be 0.5°. From this, we can find
a. the mass density of the Moon if we know its distance from the Earth.
b. diameter of the Moon if we know the Moon's distance.
c. diameter of the Moon with no other information about the Moon.
d. distance to the Moon with no other information about the Moon.
B
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A certain radioactive isotope placed near a Geiger counter registers 160 counts per minute. Eight hours later, the counter registers 10 counts per minute. What is the half-life of the isotope?
A) 8 hours B) 6 hours C) 4 hours D) 2 hours E) none of the above
In a single-slit diffraction experiment, the central maximum is broadened if the wavelength of light increased
Indicate whether the statement is true or false
A 20-ton truck collides with a 1500-lb car. Which of the following statements must be true?
A) During the collision, the force on the truck is smaller than the force on the car. B) The car did not slow down during the collision, but the truck did. C) During the collision, the force on the truck is equal to the force on the car. D) The truck did not slow down during the collision, but the car did. E) During the collision, the force on the truck is greater then the force on the car.
The fundamental frequency of HF is 8.72 × 10^13 Hz. The energy associated with a transition from the 10th to the 9th vibrational quantum number (in eV) is
a. 3.61 b. 0.361 c. 0.060 5 d. 0.605 e. 0.182