Identify the INCORRECT statements from the following: D. Number of photons of light of wavelength 2000 pm that provides 1 J of energ

Question

Identify the INCORRECT statements from the following:

A. Notation ${}_{12}^{24}{Mg}$ represents 24 protons and 12 neutrons.

B. Wavelength of a radiation of frequency $4.5 \times 10^{15} s^{- 1}$ is $6.7 \times 10^{- 8} m$

C. One radiation has wavelength $= λ_{1} (900 nm)$ and energy $= E_{1}$

Other radiation has wavelength $= λ_{2} (300 nm)$ and energy $= E_{2} . E_{1} : E_{2} = 3 : 1$

D. Number of photons of light of wavelength $2000 pm$ that provides $1 J$ of energy is $1.006 \times 10^{16} .$

Choose the correct answer from the options given below: [2026]

Smart Achievers · Accepted Answer

(4)

$(A) {}_{12}{Mg}^{24} represents 12 protons and 12 neutrons.$

$(B) λ = \frac{c}{ν} = \frac{3 \times 10^{8}}{4.5 \times 10^{15}} = 6.67 \times 10^{- 8} m$

$(C) \frac{E_{1}}{E_{2}} = \frac{h c / λ_{1}}{h c / λ_{2}} = \frac{λ_{2}}{λ_{1}}$

$\frac{E_{1}}{E_{2}} = \frac{300}{900} = \frac{1}{3} (false)$

$(D) No. of photons = \frac{Energy}{h c / λ} = 10^{16} (True)$

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