Physics

1A string vibrating in its fundamental mode has length 0.5 m. The wavelength of the wave is

2A wave has a frequency of 50 Hz and a wavelength of 4 m. Find its speed.

3A ray of light passes through the optical centre of a lens

4An object is placed 10 cm from a concave mirror of focal length 20 cm. The image is

5Which electromagnetic waves have the longest wavelength?

6Total internal reflection can occur when light travels from

7The bending of waves around obstacles is called

8A concave mirror is used as a shaving mirror because, with the face close to it, it gives

9The fundamental frequency of a closed pipe of length 0.85 m (speed of sound 340 m/s) is

10The apparent depth of a pool 2 m deep (n of water = 4/3) is