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Assertion (A): Field emission is substantially independent of temperature. Reason (R): When a high electric field is created at metal surface field emission may occur. | |
A. | Both A and R are true and R is correct explanation of A [Wrong Answer] |
B. | Both A and R are true but R is not a correct explanation of A [Correct Answer] |
C. | A is true but R is false [Wrong Answer] |
D. | A is false but R is true [Wrong Answer] |
View Answer
Explanation:-
Answer : B Discuss it below : !! OOPS Login [Click here] is required to post your answer/result |
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depends on the value of R
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TRUE
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is always 0.5
may be 0.54 or less
may be 0.5 or less
may be 0.5 or more
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TRUE
FALSE
⇒ The time base of a high frequency CRO whose screen diameter is 10 cm is set at 10 μ sec/cm. The lowest frequency which can be fully displayed on the screen is
more than 100 kHz
equal to 100 kHz
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⇒ The derating factor, for ambient temperature higher than specified, for a transistor is about
2.5 mW/°C
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10 mW/°C
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⇒ For high frequencies a capacitor like
an open circuit
a short circuit
either open circuit or short circuit
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⇒ In a series R-L circuit when excited by a 1 volt battery the current is 1 - e^{-t}. If it is excited by a source 2 sin t, the current will be
2 sin (t - 45°) + e^{-t}
2 sin (t + 45°) + e^{-t}
sin (t - 45°) + e^{-t}
sin (t + 45°) + e^{-t}
⇒ Figure repres
Adder
Multiplier
Subtractor
Log Amplifier
⇒ The circuit of figur
Precision integrator
Hartley oscillator
Butterworth high pass filter
Wien bridge oscillator
⇒ The decimal equivalent of the binary number 10110.0101011101 is
22.24082165
22.340821675
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22.3408203125
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R and L
R, L and C
R and C
R, L, G and C
⇒ Troposphere is the portion of atmosphere
nearest to ground
between 50 to 90 km above ground
between 110 to 220 km above ground
between 250 to 350 km above ground
⇒ For the power amplifier circuit shown below, the maximum power dissipated by both output transisto
9.66 W
30.11 W
31.66 W
33.66 W
⇒ In a radio receiver with simple AGC
the highest AGC voltage is produced between stations
the faster the AGC time constant, the more accurate the output
an increase in signal strength produces more AGC
the audio stage gain is normally controlled by AGC