The number of cycles of a wave that passes a stationary point in one second is c

Question

The number of cycles of a wave that passes a stationary point in one second is called its: wavelength frequency. crest trough. none of the above Which color of the visible spectrum has the longest wavelength (750 nm)? red orange green violet yellow How are wavelength and frequency of light related? Wavelength is one-half of the frequency. Wavelength is double the frequency. Wavelength increases as frequency increases. Wavelength increases as the frequency decreases. Wavelength is independent of frequency. The principal quantum number (n): specifies the 3-D shape of the orbital. specifies the subshell of the orbital. specifies the maximum number of electrons. specifies the principal shell of the orbital. none of the above How many subshells are there in the n = 4 principal shell? 1 2 3 4 not enough information

Explanation / Answer

The no of waves that are passing a stationery point in one second is called frequency and its units are cycles/sec, Hertz, cm-1 etc.

Visible Light (400 nm-750 nm) corresponds to light that can be seen by the human eye. It ranges in color from violet at the lower end to red at the higher end. so 750 nm corresponds to red color.

According to deBroglie's wave equation, = h/p , = c

here is the wavelength and is the frequency, C is the velocity of light.

Principal quantum number n tells that the principal shell for example for ns orbitals, n is the principal quantum number. for 1s orbital , n=1

For n=4 shell, there will be n-1 no of sub shells. so there will be totally 3 subshells that exists for n=4.

Thank you and good luck.

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