Question is ⇒ The transition of electron from energy level W1 to W2 is associated with emission or absorption of electro magnetic radiation of frequency f such that, Options are ⇒ (A) hf = |W1 - W2|, (B) |W1 - W2|f = h, (C) hf = 0.5|W1 - W2|, (D) (hf)2 = |W1 - W2|, (E) , Leave your comments or Download question paper.

Question is ⇒ The transition of electron from energy level W1 to W2 is associated with emission or absorption of electro magnetic radiation of frequency f such that, Options are ⇒ (A) hf = |W1 - W2|, (B) |W1 - W2|f = h, (C) hf = 0.5|W1 - W2|, (D) (hf)2 = |W1 - W2|, (E) , Leave your comments or Download question paper. Previous question Next question


Q1.	The transition of electron from energy level W₁ to W₂ is associated with emission or absorption of electro magnetic radiation of frequency f such that
A.	hf = \|W₁ - W₂\| [Correct Answer]
B.	\|W₁ - W₂\|f = h [Wrong Answer]
C.	hf = 0.5\|W₁ - W₂\| [Wrong Answer]
D.	(hf)² = \|W₁ - W₂\| [Wrong Answer]
View Answer 1 -1 Explanation:- Answer : A Discuss it below : !! OOPS Login [Click here] is required to post your answer/result Help other students, write article, leave your comments

Previous question Next question

Also Read Similar Questions Below :

⇒

Assertion (A): Artificial transmission lines are frequently used in laboratories.

Reason (R): An artificial transmission line can be used to represent an actual line and can also be used as a delay circuit, as attenuator, as filter network etc.

Both A and R are correct and R is correct explanation of A
Both A and R are correct but R is not correct explanation of A
A is correct but R is wrong
A is wrong but R is correct

⇒ If a_ac for transistor is 0.98 then β_ac is equal to
51
49
47
45

⇒ The 1150 kg geosynchronous satellite INSAT-IA parked 36000 km above India had greatly improved India's
intelligence gathering capacity
domestic communications
meteorological capability
both (b) and (c)

⇒ The efficiency of a chopper circuit is about
80% or more
around 50%
around 20%
around 5%

⇒ Two wattmeter method is suitable only for balanced loads.
TRUE
FALSE

⇒ Vidicon and plumbicon operate on the principle of
photo conduction
photo emission
photo voltaic
none of the above

⇒ Typical value of reverse current in a semiconductor diode is
0.0416666666666667
0.1 A
1 μA
0.1 μA

⇒ A 0-150 voltmeter has a guaranteed accuracy of 1% of full scale reading. If actual reading is 83 V, the percentage error is
0.0083
0.01
0.0181
none of the above

⇒ The process of deliberately adding impurity to a semi-conductor material is called
impurification
pollution
deionisation
doping

⇒ A moving coil meter has a resistance of 50 ohms and a full scale deflection current of 20 mA. To convert it into a voltmeter of 0-100 V range, the series resistance should be
5000 Ω
5050 Ω
4950 Ω
505 Ω

⇒ Two capacitors of 1 μF and 2 μF capacitance are connected in parallel across a 30 V dc battery. After the capacitors have been charged, the charges across the two capacitors will be
30 μC each
60 μC each
30 μC and 60 μC respectively
60 μC and 30 μC respectively

⇒ A thermal power plant has an efficiency of 0.4. If 0.6 kg of coal is burnt to generate 1 kWh, the calorific value of coal is
about 3500 kcal/kg
about 2500 kcal/kg
about 1500 kcal/kg
about 7500 kcal/kg

⇒ A frequency doubler has an FM signal input at 13 MHz with a deviation of 5 kHz. The output, frequency for the carrier will be
26 MHz
26.1 MHz
10 kHz
160 kHz

⇒ Input and output impedance with feedback for voltage series feedback having A = -200, R₁ = 10 kΩ, R₀ = 50 kΩ and feedback factor β = -0.2 will be
410 kΩ, 2050 kΩ
410 kΩ, 1.219 kΩ
≈ 0.243 kΩ, 2050 kΩ
≈ 0.24 kΩ, 1.219 kΩ

⇒ VLF is generally used for
telegraphy
satellite communication
instrument landing system
all of the above

⇒

Assertion (A): L[af₁(t) + bf₂(t)] = aF₁(s) - bF₂(s)

Reason (R): Initial value theroem enables us to find the value of f(t) at t = 0 directly from F(s)

Both A and R are correct and R is correct explanation of A
Both A and R are correct but R is not correct explanation of A
A is true, R is false
A is false, R is true

⇒

Match the following:

	List I		List II
A.	Horn antenna	1.	High directivity
B.	Parabolic antenna	2.	Very high directivity
C.	Lens antenna	3.	Moderate directivity

A-1, B-2, C-3
A-3, B-2, C-1
A-3, B-1, C-2
A-1, B-3, C-2

⇒ Race condition occurs in
synchronous circuit
asynchronous circuit
combinational circuit
all the Digital circuit

⇒ Calculate the resistivity of n-type semiconductor from the following data, Density of holes = 5 x 10¹² cm^-3. Density of electrons = 8 x 10¹³ cm^-3, mobility of conduction electron = 2.3 x 10⁴ cm²/ V-sec and mobility of holes = 100 cm²/V-sec.
0.43 Ω-m
0.34 Ω-m
0.42 Ω-m
0.24 Ω-m

⇒ A full adder adds
2 bits
3 bits
4 bits
any number of bits

⇒ Sound wave travels as
longitudinal waves
transverse waves
both longitudinal and transverse waves
either longitudinal or transverse wave

⇒ At room temperature the current in an intrinsic semiconductor is due to
holes
electrons
ions
holes and electrons

⇒ Which of the following microphones has maximum distortion?
Ribbon
Condenser
Crystal
Carbon

⇒ An RL impedance function can also be realized as
RC impedance function
RC admittance function
LC impedance function
LC admittance function

⇒ In a bridge inverter with single pulse width modulation
the output frequency is equal to frequency of reference signal
the output frequency is equal to frequency of control signal
either (a) or (b)
neither (a) nor (b)

⇒ The problem of current lagging is associated with
DCTL gates
DTL gates
ECL gates
CMOS gates

⇒ The relative stability of a system is given by
gain margin alone
phase margin alone
both phase and gain margins
either (a) or (b)

⇒ A varactor diode is used for
tuning
rectification
amplification
rectification and amplification

⇒ Which of the following is a digital modulation technique?
PCM
PSK
DM
All

⇒

Assertion (A): A backward wave oscillator can be used as a sweep generator.

Reason (R): The frequency of oscillation of a backward wave oscillator can be changed by varying the voltage which controls the beam velocity.

Both A and R are correct and R is correct explanation of A
Both A and R are correct but R is not correct explanation of A
A is correct but R is wrong
A is wrong but R is correct