Home
Class 12
PHYSICS
Statement-1: Short wave band are used fo...

Statement-1: Short wave band are used for transmission fo radiowaves to a large distance.
Statement-2: Short waves are reflected from ionosphere.

A

Both statement 1 and 2 are correct and 2 is correct explaination of 1

B

1 is correct but 2 is wrong

C

1 is wrong but 2 is correct

D

Both are wrong

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Topper's Solved these Questions

  • COMMUNITCATION SYSTEMS

    NCERT FINGERTIPS ENGLISH|Exercise Introduction|2 Videos

  • COMMUNITCATION SYSTEMS

    NCERT FINGERTIPS ENGLISH|Exercise Elements Of A Communication System|4 Videos

  • COMMUNITCATION SYSTEMS

    NCERT FINGERTIPS ENGLISH|Exercise NCERT|9 Videos

  • ATOMS

    NCERT FINGERTIPS ENGLISH|Exercise Assertion And Reason|15 Videos

  • CURRENT ELECTRICITY

    NCERT FINGERTIPS ENGLISH|Exercise Assertion And Reason|15 Videos

Similar Questions

Explore conceptually related problems

(A) : For long distance transmission of radio waves, short wave bands are used. (R) : Short waves are reflected from ionosphere.

Statement-1 : Electromagnetic waves with frequencies smaller than the critical frequency of ionosphere cannot be used for communications using sky wave propagation. Statement-2: The refractive index of the ionosphere becomes very high for frequencies higher than the critical frequency.

Statement-1: In stationary waves nodes are permanently at rest, so no energy is transmitted across them. And Statement-2: Nodes are points of maximum pressure.

Statement-1 : In frasonic waves are generally produced by large vibrating bodies Statement-2 : Infrasonic waves have frequency range lies below 20 Hz

Statement-1 : Description of sound as pressure wave is preferred over displacement wave Statement-2 : Source sensors (ear or mike) detect pressure changes.

Statement-1: Standing waves can not be obtained in air if the interfering waves are of diffeerent amplitudes. Statement-2: In a stationary wave, different particles in a loop have different amplitudes but same phase.

Statement-I : Electromagnetic waves with frequencies smaller than the critical frequency of ionosphere cannot be used for communication using sky wave propagation Statement-II : The refractive index of the ionosphere becomes very high for frequency.

Statement-1: When a transverse wave is reflected from a denser medium, the trough is reflected as crest and vice-versa. Statement-2: in case of reflection from a denser medium, there is inversion of the reflected wave.

Statement-1: Waves on a string are always transverse in nature. Statement-2: The velocity of a transverse wave propagating along a string is independent of the frequency of the propagating wave.

Statement-1:An isolated and free electron cannot absorb a photon completely. Statement-2 : All material particles behave wave like when in motion. Statement-3: Light of intensity l , falls normally upon a plane mirror (perfectly reflecting surface ). The pressure exerted is "2l"/c