When an electron beam strikes a block of copper, x-rays of frequency 6 x 10^18 Hz are emitted. What is the wavelength of these x-rays? Answer in units of pm.

0.5×10² pm

Explanation:

Given data:

Frequency of x-ray = 6×10¹⁸ Hz

Wavelength of x-ray = ?

Solution:

Wavelength is designated as "λ" and it is the measured in meter. It is the distance between the two crust of two trough.

Formula:

speed of wave = wavelength × frequency

speed = 3×10⁸ m/s

now we will put the values in formula.

3×10⁸ m/s = λ  × 6×10¹⁸ Hz

Hz = s⁻¹

λ  = 3×10⁸ m/s / 6×10¹⁸ s⁻¹

λ  = 0.5×10⁻¹⁰ m

m to pm

0.5×10⁻¹⁰ m × 10¹² pm/1m

0.5×10² pm

your answer is c) plasma

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