A laser produces a beam of 4000-nm light. A shutter allows a pulse of light, 30 ps in duration, to pass.
Which of the following is closest to the uncertainty in the energy of a photon in the pulse? ( h = 1.055 10-34 J s = 6.59 10-16 eV s)
A) 10-3 eV B) 10-6 eV C) 10-4 eV D) 10-2 eV E) 10-5 eV
Question 2
A 25-kg wooden sign 3.0-m long by 2.2-m high is supported by two nails along its left edge, one at the bottom of the sign and the other at the top. The nails are on the same vertical line.
Find the horizontal component of the force exerted by the upper nail. A)
250 N
B)
120 N
C)
360 N
D)
170 N
E)
280 N
Mixing bacterial genotypes produces rare recombinants
Pairs of heavy and light chains combine to form a Y-shaped molecule
Blue light is scattered more than other wavelengths by the gases in the atmosphere, giving the Earth
Pulsars are highly magnetized, rotating neutron stars that emit a beam of electromagnetic radiation.
Radial pulse.
Dorsalis pedis pulse.