Electromagnetic Waves — Physics STD 12 Science — Question

Two tuning forks vibrate with the same amplitude but the frequency of the first is double the frequency of the second. Which fork produces more intense sound in air?

A wire-loop confined in a plane is rotated in its own plane with some angular velocity. A uniform magnetic field exists in the region. Find the emf induced in the loop.

How does the energy stored in a capacitor change if the plates of a charged capacitor are moved farther, the battery remaining connected?

Can there be a potential difference between two adjacent conductors carrying the same charge?

Define current sensitivity and voltage sensitivity of a galvanometer.
Increasing the current sensitivity may not necessarily increase the voltage sensitivity of a galvanometer. Justify.

Why is Wheatstone bridge (Metre Bridge) method not suitable for measurement of very low and very high resistances?

Compare the following:
i. Wavelengths of the incident solar radiation absorbed by the earth's surface and the radiation re-radiated by the earth.
ii. Tanning effect produced on the skin by UV incident directly on the skin and that coming through glass window.

A boy puts a heavy box of mass M on his head and jumps down from the top of a multistoried building to the ground. How much is the force exerted by the box on his head during his free fall? Does the force greatly increase during the period he balances himself after striking the ground?

Define resolving power of a compound microscope. How does the resolving power of a compound microscope change when.

1. refractive index of the medium between the object and objective lens increases?
2. wavelength of the radiation used is increased?