A radio station emits radiations of $400 kHz$ . The metre band of the station is:

400 m

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750 m

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1333.33 m

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7.5 m

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Solution

The correct option is D $7.5 m$
Given: $Frequency = 400 kHz = 400 \times 10^{3} Hz$
We know that, $Frequency (ν) = \frac{Speed of light (c)}{Wavelength (λ)}$

$400 \times 10^{3} = \frac{3 \times 10^{8}}{λ}$

$\Rightarrow λ = 750 m$

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A radio station emits radiations of 400 kHz. The metre band of the station is:

The correct option is D 7.5 mGiven: Frequency=400 kHz=400×103 Hz We know that, Frequency(ν)=Speed of light (c)Wavelength (λ) 400×103=3×108λ ⇒λ=750 m

A radio station emits radiations of $400 kHz$ . The metre band of the station is:

The correct option is D $7.5 m$
Given: $Frequency = 400 kHz = 400 \times 10^{3} Hz$
We know that, $Frequency (ν) = \frac{Speed of light (c)}{Wavelength (λ)}$

$400 \times 10^{3} = \frac{3 \times 10^{8}}{λ}$

$\Rightarrow λ = 750 m$