Pradeep's Chemistry Vol 1>Chapter 2 - Structure of Atom>PROBLEMS FOR PRACTICE>Q 5

MEDIUM

11th CBSE

IMPORTANT

Earn 100

A particular radio station broadcasts at a frequency of $1120 k H z (k i l o h e r t z) .$ Another radio station broadcasts at a frequency of $98.7 M H z (M e g a h e r t z) .$ What are the wavelengths of the radiations from each station?

Important Questions on Structure of Atom

HARD

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 2 - Structure of Atom>PROBLEMS FOR PRACTICE>Q 1

Which has a higher energy: a photon of red light with a wavelength of

7500 Å

or a photon of green light with a wavelength of

5250 Å ?

MEDIUM

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 2 - Structure of Atom>PROBLEMS FOR PRACTICE>Q 2

In the ultraviolet region of the atomic spectrum of hydrogen, a line is obtained at

1026 Å .

Calculate the energy of photon of this wavelength

(h = 6.626 \times 10^{- 34} J s e c) .

HARD

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 2 - Structure of Atom>PROBLEMS FOR PRACTICE>Q 3

In the infrared region of the atomic spectrum of hydrogen, a line is obtained at

3802 c m^{- 1} .

Calculate the energy of this photon

(h = 6.626 \times 10^{- 34} J s) .

MEDIUM

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 2 - Structure of Atom>PROBLEMS FOR PRACTICE>Q 4

Light of wavelength

4000 Å

falls on the surface of caesium. Calculate the energy of the photoelectron emitted. The critical wavelength for photoelectric effect in caesium is

6600 Å

.

HARD

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 2 - Structure of Atom>PROBLEMS FOR PRACTICE>Q 5

What is the ratio between the energies of two radiations, one with a wavelength of

6000 Å

and the other with

2000 Å [1 Å = 10^{- 10} m] ?

MEDIUM

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 2 - Structure of Atom>PROBLEMS FOR PRACTICE>Q 6

The threshold energy for photoelectric emission of electrons from a metal is

3.056 \times 10^{- 15}

joule. If light of

4000 Å

wavelength is used, will the electrons be ejected or not?

(h = 6.63 \times 10^{- 34} Js) .

MEDIUM

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 2 - Structure of Atom>PROBLEMS FOR PRACTICE>Q 7

Calculate the wavelength of a photon in Angstrom units having energy of one electron volt.

MEDIUM

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 2 - Structure of Atom>PROBLEMS FOR PRACTICE>Q 8

Sodium street lamp gives off a characteristic yellow light of wavelength

588 n m .

Calculate the energy per mole

(i n k J / m o l)

of these photons.