MDCAT Physics Chapter 12 Atomic spectra Induction Online Test With Answers

image
image
image

MDCAT Physics Chapter 12 Atomic spectra Induction Online Test

Sr. # Questions Answers Choice
1
Ultraviolet radiation of 6.2 eV falls on an aluminium surface having work function βˆ… = πŸ’. 𝟐 𝒆𝑽.
The kinetic energy of the fastest electron emitted is:
 4 eV 2 eV 2.2 eV 1.2 eV
2 The threshold frequency depends on the nature on: Natural frequency Photosensitive anode Photosensitive cathode Photon
3 The frequency and work function of an incident photon are n andπ‹πŸŽ. If f0 is the threshold frequency, then necessary condition for the emission of photo electron is: < 𝑓0 𝑓 ≥ 𝑓0 f = 𝑓0/2 None of these
4 The momentum of the moving photon is: Zero ℎ 𝜆 ℎ𝜆
5 An electron and a proton are accelerated through the same potential. If their masses are me and mp respectively, then the ratio of their de-Broglie wavelength is: 1 mp/me me/mp
6 Light elements do not emit X-rays because Electrons in it have high binding energy These materials are non- material There is a small difference in their energy shells Electrons in it require very large energy to remove from these materials
7 Of electron of 50 keV strike a heavy target. Then radiation emitted by target will be Visible light Radio waves Ultraviolet None of these
8 Continuous spectrum of X-rays id due to an effect known as Photoelectric effect Compton effect Heisenberg effect Bremsstrahlung
9 Which of the following statement is true about soft X-rays? They have large wavelength They have high energy They have low energy Both A and C
10 Light of frequency 1.5 times the threshold frequency is incident on a photo sensitive material. If the frequency is halved and intensity is doubled the photo electric current becomes Four times Half Double Zero
11 The maximum energy of the electrons released in a photo cell is independent of: Frequency of incident light Intensity of incident light Nature of cathode rays None of these
12 The minimum energy required to remove an electron is called: Stopping potential Work function Kinetic energy None of these
13 electrons from the surface of a metal when: It is heated to a high temperature Radiation of suitable wavelength falls on it Electrons of suitable velocity strike it It is placed in a strong electric field
14 Which of the following is not true? The Lyman series is a continuous spectrum The Ballmer series is a line spectrum in the visible region The Paschen series is a line spectrum in the infrared region The spectral series formula can be derived from Rutherford’s model of the hydrogen atom 18. The photoelectric effect is the ejection of
15 An electron in the n=1 orbit hydrogen atom is bound by 13.6 eV. If a hydrogen atom is in the n=3 state, how much energy is required to ionize it: 13.6 eV 4.53 eV 3.4 eV 1.51eV
16 The potential difference applied to an X-rays tube is increased. As a result, in the emitted radiation The intensity increases The minimum wavelength decrease The intensity remains unchanged Both B & C
17 Light of frequency 4f0 is incident on the metal of the threshold frequency f0. The maximum kinetic energy of the emitted photoelectrons is 3h f0 3/2h f0 2h f0 1/2h f0
18 Figure represents a graph of kinetic energy (K) of the photoelectrons (in eV) and frequency (v) for a metal used as cathode in photoelectric experiment. The work function of metal is: 1 eV 2 eV 1.5 eV 3 eV
19 The ratio of the longest and shortest wavelength of the Lyman series is approximately: 4/3 9/4 9/5 16/7
20 According to Bohr’s theory, a line in the Ballmer series arises when the electron jumps from any of the higher orbits to the orbit with quantum number: 1 2 3 4
Download This Set

Is this page helpful?

×