List of top Physics Questions on Wavelength and Frequency

एक प्रगामी गुणावृत्ति (हार्मोनिक) तरंग के लिए $y(x, t) = 2.0 \cos 2\pi(10t - 0.0080x + 0.35)$ है, जहाँ x और y, cm में हैं और t सेकण्ड में है। दोलन करती हुई इस तरंग के दो बिंदु, जो कि एक-दूसरे से 0.5 m की दूरी पर हैं, के बीच का कलांतर है:

A musician hits a drum 90 times in a minute. The time period of hit is:

Obtain the expression for capacity of a parallel plate capacitor. How will the capacity of the capacitor be increased?

The Louis de Broglie wavelength of a particle having kinetic energy E is:

Electric charges are uniformly distributed in a small volume. The flux of electric field through a spherical surface of radius 2 cm surrounding the total charge is 10 V x m. The flux over a sphere of radius 4 cm will be:

State and explain Gauss's law in electrostatics. Using it, find the electric field due to a uniformly charged thin spherical shell (charge = q and radius = R) at

(A) external point of shell

(B) internal point of shell

(C) on the surface of shell.

Electron and Photon have same de Broglie wavelength, which of the following is true for their momentum:

A Carnot engine takes $ 3 \times 10^6 $ cal of heat from a reservoir at $ 627^\circ C $, and gives it to a sink at $ 27^\circ C $. The work done by the engine is:

An electron is accelerated through a potential difference of 100 volts. Calculate the de-Broglie wavelength in nm.

Following are expressions for four plane simple harmonic waves $$ y_1 = A \cos 2 \pi \left( n_1 t + \frac{x}{\lambda_1} \right), \quad y_2 = A \cos 2 \pi \left( n_1 t + \frac{x}{\lambda_1} + \pi \right), \quad y_3 = A \cos 2 \pi \left( n_2 t + \frac{x}{\lambda_2} \right), \quad y_4 = A \cos 2 \pi \left( n_2 t - \frac{x}{\lambda_2} \right) $$ The pairs of waves which will produce destructive interference and stationary waves respectively in a medium, are

Pick the correct answer from the following two statements :
(a) In VIBGYOR, wavelength increases from violet to red.
(b) In VIBGYOR, refractive index increases from violet to red.

Two materials A and B having respective work functions 3 eV and 4 eV are emitting photoelectrons of same maximum kinetic energy of 1eV. If the wavelength of incident light on A is 500 nm, then that of light incident on B is

If the momentum of an α-particle is half that of a proton, then the ratio between the wavelengths of their de-Broglie waves is

Pick out the INCORRECT statement from the following

In a transmitter the audio signal of frequency $ω_m$ is modulated by the carrier signal $ω_c$ and the band pass filter in it rejects the frequencies

Pick the correct answer from the following two statements:
(A) In VIBGYOR, wavelength increases from violet to red.
(B) In VIBGYOR, refractive index increases from violet to red.

If frequency of a photon is$ 6×10^4 Hz$, then find its wavelength[speed of light, $C= 3×10^8 m/s$]

The power radiated by a black body is P and it radiates maximum energy at wavelength, λ₀ . If the temperature of the black body is now changed so that it radiates maximum energy at wavelength $\frac{3}{4}\lambda_0$, the power radiated by it becomes nP. The value of n is

In Balmer series for hydrogen atom, find the energy of photon corresponding to longest wavelength.

An electron of mass $m_e$ and a proton of mass $m_p$ are accelerated through the same potential. Then the ratio of their de Broglie wavelengths is

A source of unknown frequency gives 4 beats/s, when sounded with a source of known frequency 250 Hz. The second harmonic of the source of unknown frequency gives five beats per second, when sounded with a source of frequency 513 Hz. The unknown frequency is

Which of the following statements is true?

Match List I with List II:

List I	List II
(A) AM Broadcast	(I) 88 – 108 MHz
(B) FM Broadcast	(II) 540 – 1600 KHz
(C) Television	(III) 3.7 – 4.2 GHz
(D) Satellite Communication	(IV) 54 – 890 MHz

Choose the correct answer from the options given below: