Question

The value of Planck’s constant is $$6.63 \times {10^{ - 34}}Js.$$   The velocity of light is $$3.0 \times {10^8}m{s^{ - 1}}.$$   Which value is closest to the wavelength in nanometers of a quantum of light with frequency of $$8 \times {10^{15}}{s^{ - 1}}?$$

A. $$4 \times {10^1}$$  
B. $$3 \times {10^7}$$
C. $$2 \times {10^{ - 25}}$$
D. $$5 \times {10^{ - 18}}$$
Answer :   $$4 \times {10^1}$$
Solution :
$$\eqalign{ & {\text{Frequency}}\left( \nu \right) \cr & = \frac{c}{\lambda } = \frac{{3 \times {{10}^8}m\,{s^{ - 1}}}}{{8 \times {{10}^{15}}{s^{ - 1}}}} \cr & = 0.375 \times {10^{ - 7}}m \cr & = 3.75 \times {10^1}nm \approx 4 \times {10^1}nm \cr} $$

Releted MCQ Question on
Physical Chemistry >> Atomic Structure

Releted Question 1

The number of neutrons in dipositive zinc ion with mass number 70 is

A. 34
B. 36
C. 38
D. 40
View Answer
Releted Question 2

Rutherford’s experiment on scattering of $$a$$ -particles showed for the first time that the atom has

A. electrons
B. protons
C. nucleus
D. neutrons
View Answer
Releted Question 3

Any $$p-$$orbital can accommodate upto

A. four electrons
B. six electrons
C. two electrons with parallel spins
D. two electrons with opposite spins
View Answer
Releted Question 4

The principal quantum number of an atom is related to the

A. size of the orbital
B. spin angular momentum
C. orbital angular momentum
D. orientation of the orbital in space
View Answer

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Atomic Structure

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