Dual Nature of Radiation and Matter Test

Result

Dual Nature of Radiation and Matter Test - 25

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
4 / -1

Wavelength of incident radiation on photo sensitive surface is 4000 Å If wavelength of this light is 3600 Å , what will be change in kinetic energy of emitted photo electron ? (h = 6.625 × 10^–34 J.s, c = 3 × 10⁸ ms^–1, 1eV = 1.6 × 10^–19 J)

A
0.52 eV

B
1.04 eV

C
2.08 eV

D
4.16 eV

Solution
Question 2
4 / -1

A hollow metallic custodial has mass 10 kg and length 10 cm. At what speed this custodial is moved in X-direction so that its de-Broglie wavelength exactly trapped in the custodial ?

A

B

C

D

Solution
Question 3
4 / -1

If we take accelerating voltage V = 50 V, electric charge of electron e = 1.6 × 10^–19 C and mass of electron m = 9.1 × 10^–31 kg find the wavelength of concerned electron.

A
0.1735 Å

B
1.735 Å

C
17.35 Å

D
1735 Å

Solution
Question 4
4 / -1

What will be energy in eV of photons of λ- rays having length 0.1 Å coming out of excited nucleus of radium?

A
42.12

B
12.42

C
22.41

D
24.21

Solution
Question 5
4 / -1

How many photons of red coloured light having wavelength 8000 Å will have same energy as one photon of violet coloured light of wavelength 4000 Å ?

A
2

B
4

C
6

D
8

Solution
Question 6
4 / -1

When a radiation of wavelength 3000 Å is incident on metal, 1.85 V stopping potential is obtained . What will be threshold wave length of metal ?

A
4539 Å

B
3954 Å

C
5439 Å

D
4395 Å

Solution
Question 7
4 / -1

Output power of He-Ne LASER of low energy is 1.00 mW. Wavelength of the light is 632.8 nm. What will be the number of photons emitted per second from this LASER ?

A
8.31 × 10¹⁵ s^–1

B
5.38 × 10¹⁵ s^–1

C
1.83 × 10¹⁵ s^–1

D
3.18 × 10¹⁵ s^–1

Solution
Question 8
4 / -1

A star which can be seen with naked eye from Earth has intensity 1.6 × 10^–9 Wm^–2 on Earth. If the corresponding wavelength is 560 nm, and the diameter of the human eye is 2.5 × 10^–3 m , the number of photons entering in our in 1 s is..............

A
7.8 × 10⁴ s^–1

B
8.85 × 10⁴ s^–1

C
7.85 × 10⁵ s^–1

D
8.85 × 10⁵ s^–1

Solution
Question 9
4 / -1

Find the velocity at which mass of a proton becomes 1.1 times its rest mass, m_g = 1.6 × 10^–27 kg Also, calculate corresponding temperature. For simplicity, consider a proton as non-interacting ideal-gas particle at 1 atm pressure

A

B

C

D
Question 10
4 / -1

Power produced by a star is 4 × 1028 W . If the average wavelength of the emitted radiations is considered to be 4500 Å the number of photons emitted in 1 s is...............

A
1 × 10⁴⁵

B
9 × 10⁴⁵

C
8 × 10⁴⁵

D
12 × 10⁴⁶

Solution