Question

The wavelength of red light is 7 x 10^-7 meter. Express this value in nanometers

Answer 1

• The wavelength of the red light in "nanometer" is 7× $10^{2}$

• Wavelength is given as : 7×$10^{-7}$ meter

• 1 nanometer = ($10^{-9}$ meter)

• Let X= value of the wavelength in nanometer.

1 nanometer  = $10^{-9}$ meter

X nanometer = 7× $10^{-7}$  meter

• If we Cross multiply

X nanometer = ($\frac{ 7* 10^{-7} }{ 10^{-9} }$)

X= 7×$10^{2}$ nanometer

Therefore, the wavelength in "nanometer" is 7×$10^{2}$

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