Atoms and Nuclei Test

Result

Atoms and Nuclei Test - 99

Score
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Weekly Quiz Competition

Question 1
4 / -1

An electron has a mass of 9.1 × 10^–31 kg. It revolvesaround the nucleus in a circular orbit of radius 0.529 × 10^–10 metre at a speed of 2.2 × 10⁶ m/s. The magnitude of its linear momentum in this motion is

A
1.1 × 10^–34kg - m/s

B
2.0 × 10^–24 kg - m/s

C
4.0 × 10^–24 kg - m/s

D
4.0 × 10^–31 kg - m/s

Solution
Question 2
4 / -1

In a beryllium atom, if a₀ be the radius of the first orbit, then the radius of the second orbit will be in general

A
na₀

B
a₀

C
n²a₀

D

Solution
Question 3
4 / -1

In a Rutherford scattering experiment when a projectile of charge z₁ and mass M₁ approaches a target nucleus of charge z₂ and mass M₂, the distance of closest approach is r₀. The energy of the projectile is

A
Directly proportional to M₁× M₂

B
Directly proportional to z₁z₂

C
Inversely proportional to z₁

D
Directly proportional to mass M₁
Question 4
4 / -1

Ionization potential of hydrogen atom is 13.6 V. Hydrogen atoms in the ground state are excited by monochromatic radiation of photon energy 12.1 eV. The spectral lines emitted by hydrogen atoms according to Bohr\'s theory will be

A
One

B
Two

C
Three

D
four

Solution
Question 5
4 / -1

Energy levels A, B, C of a certain atom corresponding to increasing values of energy. i.e., E_AB< E_C. If λ₁, λ₂, λ₃ are the wavelengths of radiations corresponding to the transitions C to B, B to A and C to A respectively, which of the following statements is correct

A

B

C

D

Solution
Question 6
4 / -1

The angular momentum of electron in n^th orbit is given by

A
nh

B

C

D
Question 7
4 / -1

The ratio of the energies of the hydrogen atom in its first to second excited state is

A
1/4

B
4/9

C
9/4

D
4

Solution
Question 8
4 / -1

The ionization energy of the electron in the hydrogen atom in its ground state is 13.6 eV. The atoms are excited to higher energy levels to emit radiations of 6 wavelengths. Maximum wavelength of emitted radiation corresponds to the transition between

A
n = 3 to n = 2 states

B
n = 3 to n = 1 states

C
n = 2 to n = 1 states

D
n = 4 to n = 3 states

Solution
Question 9
4 / -1

The ionization energy of 10 times ionized sodium atom is

A
13.6 eV

B
13.6 × 11 eV

C

D
13.6 × (11)² eV

Solution
Question 10
4 / -1

If the wavelength of the first line of the Balmer series of hydrogen is 6561 Å, the wavelength of the second lineof the series should be

A
13122 Å

B
3280 Å

C
4860 Å

D
2187 Å

Solution