Physics-
General
Easy
Question
The frequency band used for radar relay systems & T.V is
- UHF
- VLF
- VHF
- EHF
The correct answer is: UHF
Related Questions to study
physics-
Frequency ranges for micro waves are :
Frequency ranges for micro waves are :
physics-General
physics-
The higher frequency TV broad casting bands range is
The higher frequency TV broad casting bands range is
physics-General
Physics-
A string of length
is fixed at one end and carries a mass
at the other end. The string makes
revolutions per
around the vertical axis through the fixed end as shown in figure, then tension in the string is
From (i) and (ii)

A string of length
is fixed at one end and carries a mass
at the other end. The string makes
revolutions per
around the vertical axis through the fixed end as shown in figure, then tension in the string is
Physics-General
From (i) and (ii)

maths-
where
Pairs
which satisfy both the equations is/are
where
Pairs
which satisfy both the equations is/are
maths-General
maths-
The number of integral values of k for which the equation
has a solution is
The number of integral values of k for which the equation
has a solution is
maths-General
maths-
The number of distinct real roots of
in the interval
is
The number of distinct real roots of
in the interval
is
maths-General
maths-
If , then the number of real values of x, which satisfy the equation
is :
If , then the number of real values of x, which satisfy the equation
is :
maths-General
maths-
The number of solutions of the equation
in the interval
is
The number of solutions of the equation
in the interval
is
maths-General
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The possible values of such that
are :
The possible values of such that
are :
maths-General
maths-
The number of values of x in the interval [0, 3
] satisfying the equation ,
is
The number of values of x in the interval [0, 3
] satisfying the equation ,
is
maths-General
maths-
The number of solutions of tan x + sec x = 2 cos x in [0, 2], is
The number of solutions of tan x + sec x = 2 cos x in [0, 2], is
maths-General
maths-
Over the solution of
is
Over the solution of
is
maths-General
maths-
Solution to inequality cos 2x + 5 cos x + 3 ≥ 0 over
is
Solution to inequality cos 2x + 5 cos x + 3 ≥ 0 over
is
maths-General
maths-
Let
The sum of all the solutions of f (x) = 0 in [0, 100p] is
Let
The sum of all the solutions of f (x) = 0 in [0, 100p] is
maths-General
maths-
The general solution of the trigonometric equation tan x + tan 2x + tan 3x = tan x · tan 2x tan 3x is
where n
I
We know that
tan x · tan 2x · tan 3x = tan 3x – tan 2x – tan x
hence tan x + tan 2x + tan 3x = tan 3x – tan 2x – tan x
Þ tan x + tan 2x = 0
\ tan 2x = tan (– x)
2x = np – x

tan x · tan 2x · tan 3x = tan 3x – tan 2x – tan x
hence tan x + tan 2x + tan 3x = tan 3x – tan 2x – tan x
Þ tan x + tan 2x = 0
\ tan 2x = tan (– x)
2x = np – x
The general solution of the trigonometric equation tan x + tan 2x + tan 3x = tan x · tan 2x tan 3x is
where n
I
maths-General
We know that
tan x · tan 2x · tan 3x = tan 3x – tan 2x – tan x
hence tan x + tan 2x + tan 3x = tan 3x – tan 2x – tan x
Þ tan x + tan 2x = 0
\ tan 2x = tan (– x)
2x = np – x

tan x · tan 2x · tan 3x = tan 3x – tan 2x – tan x
hence tan x + tan 2x + tan 3x = tan 3x – tan 2x – tan x
Þ tan x + tan 2x = 0
\ tan 2x = tan (– x)
2x = np – x