The surface tension of a liquid is 5 newton per metre. If a film

The surface tension of a liquid is 5 newton per metre. If a film is held on a ring of area 0.02 metre², its surface energy is about

Options

(a) 5×10⁻² J
(b) 2.5×10⁻² J
(c) 2×10⁻¹ J
(d) 3×10⁻¹ J

Correct Answer:

2×10⁻¹ J

Explanation:

Surface tension = Surface energy/Surface Area
Since the film has two surface
.·. Surface energy = (5 Nm⁻¹) (2 x 0.02 m²) = 2 x 10⁻¹ J.

admin:

Related Questions

  1. A uniform electric field and uniform magnetic field are acting along the same
  2. 64 drops of mercury, each charged to a potential of 10 V, are combined
  3. Temperature is a measurement of coldness or hotness of an object.
  4. The de-Broglie wavelength of an electron in the first Bohr orbit is
  5. The frequency of fundamental tone in an open organ pipe of length