Home
Class 12
PHYSICS
Assertion : A laser beam 0.2 W power can...

Assertion : A laser beam `0.2 W` power can drill holes through a metal sheet, whereas `1000 W` torch-light cannot.
Reason : The frequency of laser light is much higher than that of torch light.

A

If both the assertion and reason are true and reason is a true explanation of the assertion.

B

If both the assertion and reason are true but the reason is not the correct explanation of assertion.

C

If the assertion and reason are false

D

If both the assertion and reason are false.

Text Solution

Verified by Experts

The correct Answer is:
C
(c ) A laser beam is a beam of light which is light amplifiaction by stimulated emission of radiation.
The energy per unit are of the laser beam is vary high as compared to the torch light.
Promotional Banner

Topper's Solved these Questions

  • CURRENT ELECTRICITY

    A2Z|Exercise Section D - Chapter End Test|29 Videos

  • CURRENT ELECTRICITY

    A2Z|Exercise AIIMS Questions|36 Videos

  • ATOMIC PHYSICS

    A2Z|Exercise Section D - Chapter End Test|30 Videos

  • DUAL NATURE OF RADIATION AND MATTER

    A2Z|Exercise Section D - Chapter End Test|30 Videos

Similar Questions

Explore conceptually related problems

Assertion : The threshold frequency of photoelectric effect supports the particle nature of light. Reason : If frequency of incident light is less than the threshold frequency, electrons are not emitted from metal surface.

Assertion : The threshold frequency of photoelectric effect supports the particle nature of sunlight . Reason : If frequency of incident light is less than the threshold frequency , electrons are not emitted from metal surface.

Assertion : The number of electrons ejected from a metal surface depend upon the frequency of light. Reason : There is a time lag between the striking of light beam and the ejection of electrons from the metal surface.

Assertion: In series combination of electric bulbs th ebulb of lower power emits more light than that of higher power bulb. Reason: The lower power bulb in series gets more current than the higher power bulb.

Assertion : A beam of white light when passed through a hollow prism cannot give spectrum. Reason : Because refractive index of air inside and outside the prism is same so no refraction and hence no deviation wll take place.

Assertion : Sound waves cannot propagate through vacuum but light waves can. Reason : Sound waves cannot be polarised but light waves can.

Assertion: Photoelectric effect proves the particle nature of light. Reason: Photoemission starts as soon as light is incident on the metal surface, provided frequency of incident light is greater than or equal to the threshold frequency.

Given below are two statements : one is labelled as Assertion A and the other is labelled as Assertion A: An electron microscope can achieve better resolving power than an optical microscope. Reason R : The de Broglie's wavelength of the electrons emitted from an electron gun is much less than wavelength of visible light. In the light of the above statements, choose the correct answer from the options given below: