When an $X$-ray photon collides with a proton,its frequency:

The momentum of a photon is $3.3 \times 10^{-29} \ kg \ m/s$. Its frequency will be

$A$ blue lamp emits light of mean wavelength $4500 \ \text{Å}$. The lamp is rated at $150 \ \text{W}$ and $8 \%$ efficiency. Calculate the number of photons emitted by the lamp per second.

The energy of a photon with a wavelength of $450 \, nm$ is ............

$A$ transmitter of $100 \ W$ power emits electromagnetic waves of wavelength $540 \ nm$. How many photons are emitted per second? (Given: $h = 6 \times 10^{-34} \ J \cdot s$,$c = 3 \times 10^8 \ m/s$)

If the emitted radiation falls in the microwave region,the device is termed as