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a. Somebody tells you that a single ultraviolet photon carries an energy equivalent of ten electronvolts (eV, see Appendix B). You suspect that the damage mechanism is that a photon delivers that energy into a volume the size of the cell nucleus and heats it up; then the increased thermal motion knocks the chromosomes apart in some way. Is this a reasonable proposal? Why or why not? [Hint: Use Equation 1.2, and the definition of calorie found just below it, to calculate the temperature change.]
Equation: (heat produced) = (mechanical energy input) × (0.24 cal/J). b. Turning the result around, suppose that that photon's energy is delivered to a small volume L3 and heats it up. We might suspect that if it heats up the region to boiling, that would disrupt any message contained in that volume. How small must L be in order for this amount of energy to heat that volume up to boiling (from 30?C to 100?C)? What could we conclude about the size of a gene if this proposal were correct
an electric dipole consists of charges e and -e separated by 0.90 nm. it is in an electric field of strength 3.00 106
a point source of light is 3.5m below the surface of a large pool of water. what is the diameter of the largest circle on the pool's surface through which light can escape
A electron is accelerated from rest by the potential difference of 350 V. It then enters a uniform magnetic field of magnitude 200 mT with its velocity perpendicular to the field.
Light with a wavelength of 634 nm passes through a slit 7.68 µm wide and falls on a screen 1.85 m away. Find the linear distance on the screen from the central bright fringe to the second dark fringe on either side. cm
a particle is projected up a plane that makes a 25deg angle with the horizontal. if initial velocity is 15 ms and
A person having skin of surface area 1.85m2 and temperature 30.0oC is resting in an insulated room where the ambient air temperature is 20.0oC. By how much does the person change the entropy
A boy flies a kite with the string at a 30 degree angle to the horizontal. The tension in the string is 4.5N. How much work does the string do on the boy
If the torque required to loosen a nut that is holding a flat tire in place on a car has a magnitude of 40.0 N•m, determine what minimum force must be exerted by the mechanic
An air core solenoid is used as an inductor in an oscillating LC circuit with a 1.50 \muF capacitor. The solenoid had a diameter of 6.40 cm, Find the number of turns in the solenoid
A uniform upward directed electric field of magnitude 1.4*10^-6 N/C has been setup between tow horizontal plates by charging the lower plate positively abnd the lower plate negatively, what is the vertical deflectio of the mass when it exits the pl..
q1. an electron moves with a horizontal velocity of 3106 ms as it enters a deflector inside a tv tube. the electron
A horizontal tube with length L has two positive charges +Q1 and +Q2 on the edges. A small ball can move without friction inside the tube (see figure). This small ball has a charge +Q and the same diameter as the tube. Find the static equilibrium ..
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