Cathode rays can move the blades of the paddle wheel placed in its path.

Cathode rays move towards

A ray of light is travelling at an angle of 20° above the horizontal. At what angle with the horizontal must a plane mirror be placed in its path so that it becomes vertically upward after reflection.

The stopping potential in a photoelectric experiment is linearly related to the inverse of the wavelength (1/lambda) of the light falling on the cathode. The potential difference applied across an X-ray tube is linearly related to the inverse of the cutoff wavelength (1/lambda) of the X-ray emitted. Show that the slopes of the lines in the two cases are equal and find its value.

Cathode rays of velocity 10^(6)ms^(-1) d escribe an approximate circular path of the radius 1m in an electric field "300 V cm"^(-1) . If the velocity of cathode rays are doubled. The value of electric field so that the rays describe the same circular path, will be

What is the difference between cathode rays and beta rays? When the two are travelling in space, can you make out which is the cathode ray and which is the beta ray?

How many of the following statement are true about the cathode rays? (i) Path of travelling is straight from the cathode with a very high velocity as it produces shadow of an object placed in its path (ii) Rays consist of material particle. (iii) They deflect towards negative end of the electrode. (iv) They produce yellow glow when the glass will beyond anode. (v) Cathode rays penetrate through thin sheets of aluminium and metals. (vi) They affect the photographic plates (vii) The ratio of charge (e) to mass (m) i.e. charge//mass is same for all cathode rays irrespective of the gas used in the tube. e//m=1.76xx10^(11) Ckg^(-1) (viii) Cathode rays are visible at low voltage.

A light ray is incident on a plane mirror at an angle of 30^(@) with horizontal. At what angle with horizontal must a plane mirror be placed in its path so that it becomes vertically upwards after reflection?

A prism of refractive index sqrt(3/2) and refracting angle is 45^(@) is placed in air. One of the two refracting surface of the prism is silvered and a ray of monochromatic light enters the prism from the other face at an angle theta . If the ray retraces its path, then what is the value of theta (in degree)?

A wheel having moment of inertia 4 kg m^(2) about its axis, rotates at rate of 240 rpm about it. The torque which can stop the rotation of the wheel in one minute is :-

Consider a light beam incident from air to a glass slab at Brewster's angle as shown in figure. A polaroid is placed in the path of the emergent ray at point P and rotated about an axis passing through the centre and pependicular to the plane of the plaroid.