What is the most appropriate procedure to evaluate this patient?
A CT scan
The work function for platinum is 6.35 eV. Ultraviolet light of wavelength 150 nm is incident on the clean surface of a platinum sample. We wish to predict the stopping voltage we will need for electrons ejected from the surface. What stopping voltage would be required to arrest the current of photoelectrons?
A refrigerator with a coefficient of performance of 4 transfers heat from a cold region at -20∘C to a hot region at 30∘C. Calculate the total entropy change of the regions when 1 kJ of heat is transferred from the cold region. Is the second law satisfied? Will this refrigerator still satisfy the second law if its coefficient of performance i 6?
When playing fortissimo (very loudly), a trumpet emits sound energy at a rate of 0.800 W out of a hell (opening) of diameter 12.7 cm. (a) What is the sound intensity level right in front of the trumpet? (b) If the trumpet radiates sound waves uniform! y in all directions, what is the sound intensity level at a distance of 10.0 m?