Question

Identify the incorrectly matched set from
the following
(A) Set-A - Wavelength (a), Set-
B – Nanometre
(B) Set-A
Set-A - Frequency (u) Set-B
Hertz
(C) Set-A
Set-A – Wave number (T),
Set-B - Metre-1
(D) Set-A - Velocity (c), Set-B –
ergs​

Answer 1

Answer:

D

Explanation:

ergs is a unit of energy

Answer 2

The answer is (D) Set-A - Velocity, Set-B – ergs

(A) Set-A - Wavelength, Set- B – Nanometre

Wavelengths are measured in nanometers (nm). One billionth of a meter is the length measurement known as a nanometer.

λ = c/f

(B) Set-A Set-A - Frequency Set-B Hertz

The number of cycles per second is equivalent to the number of hertz, or Hz. Hertz units are used to express frequency for any phenomenon having regular periodic variations.

(C) Set-A – Wave number, Set-B - Metre-1

The word "wave number" describes how many complete electromagnetic (EM) wave cycles are contained within a linear area of one meter (1 m). Reciprocal meters are used to express wave number (m-1).

(D) Set-A - Velocity, Set-B – ergs​

In terms of distance traveled in a unit of time and a direction, velocity is a vector quantity. The unit of velocity is meters per second (m/s).

Therefore option (D) Set-A - Velocity, Set-B – ergs​ is the incorrectly matched set.

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