Question

calculate the wavelength, frequency and wavenumber of light wave whose period is 5.0x10^-10 S

Answer 1

Answer:

Here's the step by step explanation

Explanation:

wave time period =

$5 \times {10}^{ - 10}$

so wave frequency = wave number = 1÷time period

that is equal to

$\frac{1}{5 \times {10}^{ - 10} }$

that equals to 1/5 × 10^10

=0.2 ×10^10

$= 2 \times {10}^{9} \: \: hertz$

wave length = ?

Speed = distance / time

so, speed of light = wave length/time period

(since it's covers 1 wavelength distance in 1 time period)

so,

$3 \times {10}^{8} = wave \: length \times 5 \times {10}^{ - 10}$

$wave \: length \: = (3 \times {10}^{8}) \div 5 \times {10}^{ - 10}$

$wave \: length \: = 3 \times {10}^{18} \div 5$

that is equal to 0.6 ×10^18

so, wave length =

$6 \times {10}^{17} metres$

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