According to the quantum theory of radiation,
a. radiation goes through only one of the two slits in the double-slit experiment with radiation.
b. an electromagnetic field can have only certain values of total energy and no other values.
c. electromagnetic fields are really made of particles.
d. electromagnetic fields must vibrate only at one particular frequency.
e. the total quantity of energy that an electromagnetic field can contain must be less than a certain maximum value

There are weak or strong attractive forces between atoms of liquids with a high viscosity

Ahot-air balloonist, rising vertically with a constant speed of 5.00 m/s releases a sandbag at the instant the balloon is 40.0 m above the ground. after it is released, the sandbag encounters no appreciable air drag. compute the velocity of the sandbag at 0.250 s after its release.

The ultracentrifuge is an important tool for separating and analyzing proteins. because of the enormous centripetal accelerations, the centrifuge must be carefully balanced, with each sample matched by a sample of identical mass on the opposite side. any difference in the masses of opposing samples creates a net force on the shaft of the rotor, potentially leading to a catastrophic failure of the apparatus. suppose a scientist makes a slight error in sample preparation and one sample has a mass 10 mg larger than the opposing sample. if the samples are 12 cm from the axis of the rotor and the ultracentrifuge spins at 70,000 rpm, what is the magnitude of the net force on the rotor due to the unbalanced samples? ( be thorough on your answer)