Dual Nature of Radiation and Matter Test

Result

Dual Nature of Radiation and Matter Test - 30

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Weekly Quiz Competition

Question 1
4 / -1

de - Broglic wavelength of electron in nth Bohr orbit is............

A

B

C

D
Question 2
4 / -1

If work function of potassium is 3 eV. its threshold wavelength = ..................
(h = 6.625 × 10^–34 J.s, c = 3 × 10⁸ ms^–1. 1 eV = 1.6 × 10^–19 J.s)

A
4125 Å

B
1860 Å

C
1860 nm

D
4125 nm

Solution
Question 3
4 / -1

In photo electric effect, if threshold wave length of a metal is 5000 Å work function of this metal is....................eV.
(h = 6.625 × 10^–34 J.s, c = 3 × 10⁸ ms^–1. 1 eV = 1.6 × 10^–19 J.s)

A
1.24

B
2.48

C
4.96

D
3.72

Solution
Question 4
4 / -1

Work functions for tungsten and sodium are 4.5 eV and 2.3 eV respectively. If threshold wavelength of sodium is 5460 Å , threshold wavelength for tungsten will be......................Å 

A
528

B
10683

C
2791

D
5893

Solution
Question 5
4 / -1

Photo sensitive surface is incident by light having frequency 3 times its threshold frequency. In this condition, if frequency of light is made half and intensity of light is made double, magnitude of photo electric current becomes........................

A
Fourth

B
double

C
half

D
zero
Question 6
4 / -1

If ratio of threshold frequencies of two metals is 1 : 3, ratio of their work functions is.............

A
1 : 3

B
3 : 1

C
4 : 16

D
16 : 4

Solution
Question 7
4 / -1

It work function of Na and Fe are 2.5 eV and 5 eV respectively ratio of their threshold frequencies.........................

A
2 : 1

B
1 : 2

C
125 : 1

D
1 : 1

Solution
Question 8
4 / -1

If electron is accelerated under the effect of 200 V p.d., its kinetic energy = ...................

A
1.6 × 10^–17 J

B
3.2 × 10^–17 J

C
4.8 × 10^–17 J

D
6.4 × 10^–17 J

Solution
Question 9
4 / -1

In quantum mechanics, a particle.......................

A
can be regarded as group of harmonic waves.

B
can be regarded as a single wave of definite wavelength only

C
Can be regarded as only a pair of two harmonic waves

D
is a point-like object with mass.
Question 10
4 / -1

The de-Broglie wavelength of a proton and α - particle is same. The ratio of their velocities will be.............. (α - particle is the He-nucleus, having two protons and two neutrons. Thus, its mass M_α = 4m_p where m_p is the mass of the proton.)

A
1 : 4

B
1 : 2

C
2 : 1

D
4 : 1

Solution