Explanation

The stopping potential is the voltage applied to the electrodes in a photoelectric effect experiment that just prevents the most energetic electrons from reaching the anode.

Since the kinetic energy of the ejected electrons is directly proportional to the frequency of the incident light (above the threshold frequency), a higher frequency light will result in more energetic electrons.

Therefore, the stopping potential, which is the voltage needed to completely stop these most energetic electrons, is also directly proportional to their energy. 

Explanation

If light strikes the surface of glass with the equation r=r0 sin(ωt), the equation after reflection will be r=r0 sin(ωt).

Explanation

If the angle between the vector area and the electric field is 30∘, then the flux will be maximum when √3/2.

Explanation

The photoelectric effect occurs at energies less than 0.5 MeV.

Explanation

The Compton effect is maximum at a scattering angle of 180 degrees.

Explanation

We are told:

• A copper penny is heated to 100 °C.

• Its diameter increases by 0.17%.

• We are to find the percentage increase in the area of one of its circular faces.

Let’s denote:

• Original diameter: $D$
  

• Increased diameter: $D' = D + Delta D = D (1 + 0.0017)$

• Area of a circle: $\mathrm{<br>}$

• New area:

  A′=π(D′)^2​/4=(D(1+0.0017))^2/4π​=A⋅(1+0.0017)^2

Use binomial expansion (for small x):

(1+x)^2≈1+2xwhen x is small

Here, $x=0.0017$, so:

(1+0.0017)^2≈1+2(0.0017)=1+0.0034=1.0034

Thus, the area increases by:

0.34%​

Explanation

The unit of the decay constant is s⁻¹.

It represents the probability per second that a nucleus will decay.

It indicating how quickly a radioactive substance undergoes decay.

Explanation

Explanation

If mass of bob of simple pendulum increase its time period will unaffected.

As time period only depends only depends upon length of pendulum and acceleration due to gravity at that position.

$T=\sqrt[2\pi ]{2\pi \frac{l}{g}}$

$T$ = time period

$l$= length of pendulum

$g$= Acceleration at the position of simple pendulum.

Explanation

If the source moves toward the observer, the frequency of the sound waves perceived by the observer increases due to the Doppler effect.