Dual Nature of Radiation and Matter  MCQs

MCQs of Dual Nature of Radiation and Matter

Showing 1 to 10 out of 186 Questions
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1.
Cathode rays _____
(a) are the atoms moving towards the cathode.
(b) are electromagnetic waves.
(c) are negative ions travelling from cathode to anode.
(d) are electrons emitted by cathode and travelling towards anode.
Answer:

Option (d)

2.
The velocity of photon emitted in photo-electric effect depends on the properties of photosensitive surface and _____
(a) frequency of incident light
(b) state of polarization of incident light
(c) time for which the light is incident
(d) intensity of incident light
Answer:

Option (a)

3.
Photoelectric effect represents that
(a) electron has a wave nature
(b) light has a particle nature
(c) (1) and (2) both
(d) none of the above
Answer:

Option (b)

4.
Cathode rays travelling in the direction from east to west enter in an electric field directed from north to south. They will deflect in _____
(a) east
(b) west
(c) south
(d) north
Answer:

Option (d)

5.
If photoelectric effect is not seen with the ultraviolet radiations in a given metal, photo electrons may be emitted with the _____
(a) infrared waves
(b) radio waves
(c) X-rays
(d) visible light
Answer:

Option (c)

6.
Photons of energy 1 eV and 2.5 eV successively illuminate a metal whose work function is 0.5 eV, The ratio of maximum speed of emitted electron is _____
(a) 1 : 2
(b) 2 : 1
(c) 3 : 1
(d) 1 : 3
Answer:

Option (a)

7.
In quantum mechanics, a particle _____
(a) can be regarded as a group of harmonic waves.
(b) can be regarded as a single wave of definite wave-length only
(c) can be regarded as only a pair of two harmonic waves
(d) is a point-like object with mass
Answer:

Option (b)

8.
Which of the following physical quantity has the dimension of plank constant (h) ?
(a) Force
(b) Angular momentum
(c) Energy
(d) Power
Answer:

Option (b)

9.
Which of the following statement is not true for a photon ?
(a) Photon produces pressure
(b) Photon has energy hf.
(c) Photon has momentum hfc
(d) Rest mass of photon is zero
Answer:

Option (a)

10.
De Broglie wavelentgh of a particle moving with velocity 2.25 × 108 m s-1 is same as the wavelength of photon. The ratio of kinetic energy of the particle to the energy of photon is _____ Velocity of light = 3 × 108 m s-1
(a) 18
(b) 38
(c) 58
(d) 78
Answer:

Option (b)

Showing 1 to 10 out of 186 Questions
1 2 3 4 5 6