A photon has wavelength $400\,nm$. Its frequency is approximately
A$7.5 \times 10^{14}\,Hz$
B$7.5 \times 10^{12}\,Hz$
C$4.0 \times 10^{16}\,Hz$
D$1.3 \times 10^{6}\,Hz$
Answer & Solution
Correct answer: A. $7.5 \times 10^{14}\,Hz$
$\nu = c/\lambda = (3 \times 10^{8})/(400 \times 10^{-9}) = 7.5 \times 10^{14}\,Hz$.
Related questions
Calcium-40 (Z=20, A=40) and Argon-40 (Z=18, A=40) are best described as:Atoms of the SAME element with DIFFERENT mass numbers are called:An atom of chlorine has atomic number Z = 17 and mass number A = 37. The number of neutronThe atomic number (Z) of an element is equal to the:The neutron was discovered by:Bohr's model of the atom fixed Rutherford's instability problem by proposing that electronRutherford's gold foil experiment concluded that most of the atom is:The Rydberg constant for hydrogen, in SI units, is