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3 years ago

A barcode scanner emits a red light with frequency of 4.62x1014 s –1 . What is the wavelength of this light in nm?

Physics

1 answer:

NemiM [27]3 years ago

4 0

Answer:

λ = 649 nm

Explanation:

given,

frequency,f = 4.62 x 10¹⁴ Hz

speed of light,c = 3 x 10⁸ m/s

we know,

c = f λ

$\lambda=\dfrac{c}{f}$

$\lambda=\dfrac{3\times 10^8}{4.62\times 10^{14}}$

λ = 6.4935 x 10⁻⁷ m

λ = 649 x 10⁻⁹ m

λ = 649 nm

the wavelength of this light is equal to 649 nm

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Answer:

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The radius of the circular loop is:

$\Sigma F_{r} = -90\,N -(0.3\,kg)\cdot (9.807\,\frac{m}{s^{2}} ) = -(0.3\,kg)\cdot \frac{v^{2}}{R}$

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Answer:

v = 1.98*10^8 m/s

Explanation:

Given:

- Rod at rest in S' frame

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What must be the value of v if as measured in S the rod is at a 45 degree)

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x' component = L*cos(Q)

y' component = L*sin(Q)

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x component = L*cos(Q) / γ (Length contraction)

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