Alpha Question Bank for Engineering: Chemistry>Chapter 2 - Structure of Atom>Exercise-1>Q 7

MEDIUM

JEE Main/Advance

IMPORTANT

Earn 100

How many photons are emitted per second by a $5 mW$ laser operating at $620 nm$ ?

Important Questions on Structure of Atom

MEDIUM

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 2 - Structure of Atom>Exercise-1>Q 8

The Vividh Bharati Station of All India Radio, Delhi broadcasts on a frequency of

1368 kHz

(kiloHertz). Calculate the wavelength and wave number of the electromagnetic radiation emitted by the transmitter.

MEDIUM

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 2 - Structure of Atom>Exercise-1>Q 9

One quantum is absorbed per gaseous molecule of

{Br}_{2}

for converting into

Br

atoms. If light absorbed has wavelength

5000 Å

, calculate energy required in

kJ {mol}^{- 1}

.

MEDIUM

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 2 - Structure of Atom>Exercise-1>Q 10

The eyes of a reptile pass a visual signal to the brain when the visual receptors are struck by photons of wavelength

850 nm

If an energy of

3.15 \times 10^{- 14} J

is required to trip the signal, what is the minimum number of photons that must strike the receptor

(h = 6.6 \times 10^{- 34}) ?

EASY

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 2 - Structure of Atom>Exercise-1>Q 12

If a light with frequency of

4.0 \times 10^{16}

Hz

emitted photoelectrons with double the kinetic energy as are emitted by the light of frequency

2.5 \times 10^{16} Hz

from the same metal surface then what is the threshold frequency of the metal?

MEDIUM

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 2 - Structure of Atom>Exercise-1>Q 13

Which state of the triply ionised beryllium,

{Be}^{3 +}

, has the same radius as that of the ground state of hydrogen atom?

MEDIUM

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 2 - Structure of Atom>Exercise-1>Q 14

If the velocity of the electron in first orbit of

H

atom is

2.18 \times 10^{6} {ms}^{- 1},

what is its value in third orbit?

MEDIUM

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 2 - Structure of Atom>Exercise-1>Q 15

Consider Bohr's theory for hydrogen atom. The magnitude of angular momentum, orbit radius and velocity of the electron in

n^{th}

energy state in a hydrogen atom are

l, r

and

v

respectively. Find out the value of

{}^{'}x^{'},

if product of

v, r

and

l (vrl)

is directly proportional to

n^{x} .

MEDIUM

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 2 - Structure of Atom>Exercise-1>Q 16

Find the ratio of the time period of

2^{nd}

Bohr orbit of

{He}^{+}

and

4^{th}

Bohr orbit of

{Li}^{2 +} .